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Question1
PC300-001
Discernible Boundary and Area of a Specified Iceberg
Within the supplied candidate region, identify the largest complete iceberg, delineate its boundary, and calculate its area. Interpretation requirements: delineate the discernible iceberg body on the original 40 m sampling grid. Include grounded icebergs. The accompanying search.geojson specifies a candidate region for...
true
Segmentation and Spatial Structure Analysis
construction_candidate
[ "01_SARIB_V1_0529_20250323t181854_12_17_ninnisbank.tif", "02_SARIB_V1_0529_20250323t181854_12_17_ninnisbank_search.geojson" ]
Question1/task.json
{"boundary": {"type": "geometry", "iou_threshold": 0.8}, "area_km2": {"type": "numeric", "absolute_tolerance": 0.047413384898924826}}
2
Question2
PC300-002
Discernible Boundary and Area of a Specified Iceberg
Within the supplied candidate region, identify the largest complete iceberg, delineate its boundary, and calculate its area. Interpretation requirements: delineate the discernible iceberg body on the original sampling grid. Include grounded icebergs. The accompanying search.geojson specifies a candidate region for loca...
true
Segmentation and Spatial Structure Analysis
construction_candidate
[ "01_SARIB_V1_0095_20250411t100805_0_1_iw.tif", "02_SARIB_V1_0095_20250411t100805_0_1_iw_search.geojson" ]
Question2/task.json
{"boundary": {"type": "geometry", "iou_threshold": 0.8}, "area_km2": {"type": "numeric", "absolute_tolerance": 0.05381592072244584}}
3
Question3
PC300-003
Discernible Boundary and Area of a Specified Iceberg
Within the supplied candidate region, identify the largest complete iceberg, delineate its boundary, and calculate its area. Interpretation requirements: delineate the discernible iceberg body on the original sampling grid. Include grounded icebergs. The accompanying search.geojson specifies a candidate region for loca...
true
Segmentation and Spatial Structure Analysis
construction_candidate
[ "01_SARIB_V1_0273_20230312t180236_0_26_ninnisbank.tif", "02_SARIB_V1_0273_20230312t180236_0_26_ninnisbank_search.geojson" ]
Question3/task.json
{"boundary": {"type": "geometry", "iou_threshold": 0.8}, "area_km2": {"type": "numeric", "absolute_tolerance": 0.03886611953374147}}
4
Question4
PC300-004
Counting Fully Visible Icebergs
How many independent icebergs are fully visible, each with a body area of at least 4 original pixels? Exclude icebergs truncated by the image boundary, and do not count bright patches within one iceberg as separate objects. Return only a nonnegative integer.
true
Segmentation and Spatial Structure Analysis
construction_candidate
[ "01_I03_004.png" ]
Question4/task.json
{"answer": {"type": "exact"}}
5
Question5
PC300-005
Counting Fully Visible Icebergs
Count fully visible independent icebergs with body areas of at least 4 original pixels, including grounded icebergs. Exclude icebergs truncated by the image boundary, and count bright patches within the same iceberg only once. Return only a nonnegative integer.
true
Segmentation and Spatial Structure Analysis
construction_candidate
[ "01_SARIB_V1_0042_20230214t181856_2_11_ninnisbank.tif" ]
Question5/task.json
{"answer": {"type": "exact"}}
6
Question6
PC300-006
Counting Fully Visible Icebergs
Count fully visible independent icebergs with body areas of at least 4 original pixels, including grounded icebergs. Exclude icebergs truncated by the image boundary, and count bright patches within the same iceberg only once. Return only a nonnegative integer.
true
Segmentation and Spatial Structure Analysis
construction_candidate
[ "01_SARIB_V1_0001_20210306t152827_10_10_prydzbay.tif" ]
Question6/task.json
{"answer": {"type": "exact"}}
7
Question7
PC300-007
Image-Based Tracking and Region-Entry Events
Given 3 full-scene Sentinel-1 SAR images, order them by the timestamps in observation.json. A loose search box for B46 is provided only for the first observation. Identify the same iceberg in each image and estimate the approximate geometric center of its complete body, excluding shadows. Return centres_colrow for ever...
true
Change Analysis
construction_candidate
[ "01_T0.tif", "02_T1.tif", "03_T2.tif", "04_observation.json", "05_TRIPLE_04_B46_region.json" ]
Question7/task.json
{"centres_colrow": {"type": "numeric_array", "absolute_tolerance": 30}, "inside": {"type": "exact"}, "entry_brackets": {"type": "exact"}}
8
Question8
PC300-008
Image-Based Tracking and Region-Entry Events
Given 2 full-scene Sentinel-1 SAR images, order them by the timestamps in observation.json. A loose search box for B42 is provided only for the first observation. Identify the same iceberg in each image and estimate the approximate geometric center of its complete body, excluding shadows. Return centres_colrow for ever...
true
Change Analysis
construction_candidate
[ "01_T0.tif", "02_T1.tif", "03_observation.json", "04_PAIR_08_B42_region.json" ]
Question8/task.json
{"centres_colrow": {"type": "numeric_array", "absolute_tolerance": 30}, "inside": {"type": "exact"}, "entry_brackets": {"type": "exact"}}
9
Question9
PC300-009
Image-Based Tracking and Region-Entry Events
Given 2 full-scene Sentinel-1 SAR images, order them by the timestamps in observation.json. A loose search box for B15AA is provided only for the first observation. Identify the same iceberg in each image and estimate the approximate geometric center of its complete body, excluding shadows. Return centres_colrow for ev...
true
Change Analysis
construction_candidate
[ "01_T0.tif", "02_T1.tif", "03_observation.json", "04_PAIR_09_B15AA_region.json" ]
Question9/task.json
{"centres_colrow": {"type": "numeric_array", "absolute_tolerance": 30}, "inside": {"type": "exact"}, "entry_brackets": {"type": "exact"}}
10
Question10
PC300-010
Image-Based Tracking with Position-Error Propagation
Given 3 full-scene Sentinel-1 SAR images, order them by the timestamps in observation.json. A loose search box for C32 is provided only for the first observation. Identify the same iceberg in each image and estimate the approximate geometric center of its complete body, excluding shadows. Return centres_colrow for ever...
true
Change Analysis
construction_candidate
[ "01_T0.tif", "02_T1.tif", "03_T2.tif", "04_observation.json" ]
Question10/task.json
{"centres_colrow": {"type": "numeric_array", "absolute_tolerance": 30}, "segment_distance_bounds_km": {"type": "numeric_array", "absolute_tolerance": 2.5}, "segment_speed_bounds_km_day": {"type": "numeric_array", "absolute_tolerance": 0.4167004271179378}, "net_distance_bounds_km": {"type": "numeric_array", "absolute_to...
11
Question11
PC300-011
Image-Based Tracking with Position-Error Propagation
Given 2 full-scene Sentinel-1 SAR images, order them by the timestamps in observation.json. A loose search box for C28B is provided only for the first observation. Identify the same iceberg in each image and estimate the approximate geometric center of its complete body, excluding shadows. Return centres_colrow for eve...
true
Change Analysis
construction_candidate
[ "01_T0.tif", "02_T1.tif", "03_observation.json" ]
Question11/task.json
{"centres_colrow": {"type": "numeric_array", "absolute_tolerance": 30}, "segment_distance_bounds_km": {"type": "numeric_array", "absolute_tolerance": 2.5}, "segment_speed_bounds_km_day": {"type": "numeric_array", "absolute_tolerance": 0.20833313239474113}, "net_distance_bounds_km": {"type": "numeric_array", "absolute_t...
12
Question12
PC300-012
Image-Based Tracking with Position-Error Propagation
Given 3 full-scene Sentinel-1 SAR images, order them by the timestamps in observation.json. A loose search box for B15Z is provided only for the first observation. Identify the same iceberg in each image and estimate the approximate geometric center of its complete body, excluding shadows. Return centres_colrow for eve...
true
Change Analysis
construction_candidate
[ "01_T0.tif", "02_T1.tif", "03_T2.tif", "04_observation.json" ]
Question12/task.json
{"centres_colrow": {"type": "numeric_array", "absolute_tolerance": 30}, "segment_distance_bounds_km": {"type": "numeric_array", "absolute_tolerance": 2.5}, "segment_speed_bounds_km_day": {"type": "numeric_array", "absolute_tolerance": 0.49942081058772114}, "net_distance_bounds_km": {"type": "numeric_array", "absolute_t...
13
Question13
PC300-013
Continuous Tracking, Turning, and Detour Analysis
Given 4 full-scene Sentinel-1 SAR images, order them by the timestamps in observation.json. A loose search box for A68B is provided only for the first observation. Identify the same iceberg in each image and estimate the approximate geometric center of its complete body, excluding shadows. Return centres_colrow for eve...
true
Change Analysis
construction_candidate
[ "01_T0.tif", "02_T1.tif", "03_T2.tif", "04_T3.tif", "05_observation.json" ]
Question13/task.json
{"centres_colrow": {"type": "numeric_array", "absolute_tolerance": 30}, "turn_angles_deg": {"type": "numeric_array", "absolute_tolerance": 15}, "segment_speeds_km_day": {"type": "numeric_array", "absolute_tolerance": 0.49942081058772114}, "sampled_path_km": {"type": "numeric", "absolute_tolerance": 7.5}, "net_distance_...
14
Question14
PC300-014
Segment-Wise Iceberg Speed Changes
Track the same B43 iceberg across the four images. The loose search box for T0 and the timestamps are given in observation.json. Using the geometric center of the complete target, calculate WGS84 net displacement divided by elapsed time for the three segments. Return the speeds in chronological order and the index of t...
true
Change Analysis
construction_candidate
[ "01_T0.tif", "02_T1.tif", "03_T2.tif", "04_T3.tif", "05_observation.json" ]
Question14/task.json
{"segment_speeds_km_day": {"type": "numeric_array", "absolute_tolerance": 0.3}, "fastest_segment": {"type": "exact"}}
15
Question15
PC300-015
Observed Area Change of the Same Iceberg
Delineate the complete visible body of B41 in both observations, excluding shadows. Calculate both areas on the WGS84 ellipsoid, T1 minus T0, and the percentage change relative to T0. Also output both boundaries as WGS84 GeoJSON files. Timestamps and target hints are provided in observation.json. Both original grids ar...
true
Change Analysis
construction_candidate
[ "01_B41_T0.tif", "02_B41_T1.tif", "03_B41_observation.json" ]
Question15/task.json
{"area_t0_km2": {"type": "numeric", "absolute_tolerance": 3.961191452372098, "unit": "km2"}, "area_t1_km2": {"type": "numeric", "absolute_tolerance": 77.35343044442675, "unit": "km2"}, "change_km2": {"type": "numeric", "absolute_tolerance": 108.29480262219744, "unit": "km2"}, "change_percent": {"type": "numeric", "abso...
16
Question16
PC300-016
Ranking Physical Iceberg Areas Across Resolutions
Rank the specified icebergs in images A, B, and C by physical area, from largest to smallest, and select the correct option.
true
Segmentation and Spatial Structure Analysis
pending_human_annotation_review
[ "01_target.tif", "02_landsat_red_30m.tif", "03_B41_T0.tif" ]
Question16/task.json
{"choice": {"type": "exact", "allowed": ["A", "B", "C", "D"]}}
17
Question17
PC300-017
Comparing Iceberg Densities Between Regions
Compare iceberg number densities in the two supplied valid survey regions A and B from the same Sentinel-2 scene. Use the supplied iceberg boundaries. Count only objects lying entirely within the corresponding survey region with WGS84 ellipsoidal area ≥0.001 km². Exclude objects touching or crossing the region boundary...
true
Segmentation and Spatial Structure Analysis
construction_candidate
[ "01_rgb.tif", "02_iceberg_objects.geojson", "03_counting_regions.geojson" ]
Question17/task.json
{"counts_A_B": {"type": "exact"}, "valid_area_km2_A_B": {"type": "numeric_array", "absolute_tolerance": 1e-05}, "density_per_km2_A_B": {"type": "numeric_array", "absolute_tolerance": 1e-06}, "higher_density_region": {"type": "exact"}}
18
Question18
PC300-018
Path Length and Net Displacement of a Supplied Track
For the 12 date-ordered positions of A22A, connect adjacent positions by shortest WGS84 geodesics. Calculate the sampled polyline length (km), first-to-last net displacement (km), their ratio, path length divided by total calendar days, and net displacement divided by total calendar days (km/day). The original data pro...
true
Change Analysis
construction_candidate
[ "01_a22a.json" ]
Question18/task.json
{"path_length_km": {"type": "numeric", "absolute_tolerance": 0.001}, "net_displacement_km": {"type": "numeric", "absolute_tolerance": 0.001}, "path_to_net_ratio": {"type": "numeric", "absolute_tolerance": 1e-06}, "path_speed_km_day": {"type": "numeric", "absolute_tolerance": 0.001}, "net_speed_km_day": {"type": "numeri...
19
Question19
PC300-019
Path Length and Net Displacement of a Supplied Track
For the 12 date-ordered positions of A35C, connect adjacent positions by shortest WGS84 geodesics. Calculate the sampled polyline length (km), first-to-last net displacement (km), their ratio, path length divided by total calendar days, and net displacement divided by total calendar days (km/day). The original data pro...
true
Change Analysis
construction_candidate
[ "01_a35c.json" ]
Question19/task.json
{"path_length_km": {"type": "numeric", "absolute_tolerance": 0.001}, "net_displacement_km": {"type": "numeric", "absolute_tolerance": 0.001}, "path_to_net_ratio": {"type": "numeric", "absolute_tolerance": 1e-06}, "path_speed_km_day": {"type": "numeric", "absolute_tolerance": 0.001}, "net_speed_km_day": {"type": "numeri...
20
Question20
PC300-020
Path Length and Net Displacement of a Supplied Track
For the 12 date-ordered positions of A35A, connect adjacent positions by shortest WGS84 geodesics. Calculate the sampled polyline length (km), first-to-last net displacement (km), their ratio, path length divided by total calendar days, and net displacement divided by total calendar days (km/day). The original data pro...
true
Change Analysis
construction_candidate
[ "01_a35a.json" ]
Question20/task.json
{"path_length_km": {"type": "numeric", "absolute_tolerance": 0.001}, "net_displacement_km": {"type": "numeric", "absolute_tolerance": 0.001}, "path_to_net_ratio": {"type": "numeric", "absolute_tolerance": 1e-06}, "path_speed_km_day": {"type": "numeric", "absolute_tolerance": 0.001}, "net_speed_km_day": {"type": "numeri...
21
Question21
PC300-021
Speed Bounds Under Position Uncertainty
Given two position estimates, assume that each horizontal position error is bounded by a geodesic circle of radius 0.5 km, as specified for this task. Use the triangle inequality to give conservative intervals for net displacement and average speed, treating time as exact. Return JSON with fields: distance_interval_km,...
true
Change Analysis
construction_candidate
[ "01_T0.tif", "02_T1.tif", "03_positions.json" ]
Question21/task.json
{"distance_interval_km": {"type": "numeric_array", "absolute_tolerance": 0.001}, "speed_interval_km_day": {"type": "numeric_array", "absolute_tolerance": 0.001}}
22
Question22
PC300-022
Observed Time Interval of Iceberg Region Entry
Using the supplied position sequence for A38B and WGS84 region R, determine whether each observation lies within R, including its boundary. To avoid longitude wrapping at 180°, transform both the points and R into the supplied local projection before testing: +proj=aeqd +lat_0=-72.1337 +lon_0=-58.0126 +datum=WGS84 +uni...
true
Change Analysis
construction_candidate
[ "01_a38b.json", "02_a38b_region.geojson" ]
Question22/task.json
{"inside": {"type": "exact"}, "first_inside_date": {"type": "exact"}, "last_outside_date": {"type": "exact"}}
23
Question23
PC300-023
Observed Time Interval of Iceberg Region Entry
Using the supplied position sequence for A38C and WGS84 region R, determine whether each observation lies within R, including its boundary. To avoid longitude wrapping at 180°, transform both the points and R into the supplied local projection before testing: +proj=aeqd +lat_0=-66.1794 +lon_0=-57.5741 +datum=WGS84 +uni...
true
Change Analysis
construction_candidate
[ "01_a38c.json", "02_a38c_region.geojson" ]
Question23/task.json
{"inside": {"type": "exact"}, "first_inside_date": {"type": "exact"}, "last_outside_date": {"type": "exact"}}
24
Question24
PC300-024
Observed Time Interval of Iceberg Region Entry
Using the supplied position sequence for A20B and WGS84 region R, determine whether each observation lies within R, including its boundary. To avoid longitude wrapping at 180°, transform both the points and R into the supplied local projection before testing: +proj=aeqd +lat_0=-61.3 +lon_0=-51.5 +datum=WGS84 +units=m. ...
true
Change Analysis
construction_candidate
[ "01_a20b.json", "02_a20b_region.geojson" ]
Question24/task.json
{"inside": {"type": "exact"}, "first_inside_date": {"type": "exact"}, "last_outside_date": {"type": "exact"}}
25
Question25
PC300-025
Presence of a Visible Iceberg
Is there a clearly visible iceberg in the image? A. Yes B. No Select one option and return only its letter.
true
Recognition, Localization and Knowledge Interpretation
construction_candidate
[ "01_target.png" ]
Question25/task.json
{"answer": {"type": "exact"}}
26
Question26
PC300-026
Retrieving and Measuring a Specified Iceberg
Select an image pair from frozen_catalog.json: the inclusive UTC date window is 2018-12-01 through 2018-12-31; the observations must be no more than 5 days apart; pixel spacing must be ≤40 m; both footprints must fully cover search_aoi.geojson; and catalog valid-coverage fractions must be ≥0.90. Footprint coverage diff...
true
Change Analysis
construction_candidate
[ "01_frozen_catalog.json", "02_search_aoi.geojson", "03_T0.tif", "04_T1.tif", "05_T3.tif" ]
Question26/task.json
{"selected_assets": {"type": "exact"}, "excluded_outside_aoi": {"type": "set"}, "area_t0_km2": {"type": "numeric", "absolute_tolerance": 3.961191452372098, "unit": "km2"}, "area_t1_km2": {"type": "numeric", "absolute_tolerance": 77.35343044442675, "unit": "km2"}, "change_km2": {"type": "numeric", "absolute_tolerance": ...
27
Question27
PC300-027
Iceberg Boundary Perimeter
Calculate the total boundary length (m) of all exterior rings and interior holes in the supplied WGS84 iceberg polygon. Use shortest WGS84 ellipsoidal geodesics between adjacent vertices, sum all multipart components, and do not smooth the boundary. Return JSON containing only: perimeter_m. Do not append unit strings t...
true
Segmentation and Spatial Structure Analysis
construction_candidate
[ "01_SARIB_V1_0023_20210312t112234_2_19_porpoisebay.geojson", "02_SARIB_V1_0023_20210312t112234_2_19_porpoisebay.tif" ]
Question27/task.json
{"perimeter_m": {"type": "numeric", "absolute_tolerance": 0.05}}
28
Question28
PC300-028
Iceberg Boundary Perimeter
Calculate the total boundary length (m) of all exterior rings and interior holes in the supplied WGS84 iceberg polygon. Use shortest WGS84 ellipsoidal geodesics between adjacent vertices, sum all multipart components, and do not smooth the boundary. Return JSON containing only: perimeter_m. Do not append unit strings t...
true
Measurement and Counting
construction_candidate
[ "01_SARIB_V1_0078_20250403t192707_0_1_marthacoast.geojson", "02_SARIB_V1_0078_20250403t192707_0_1_marthacoast.tif" ]
Question28/task.json
{"perimeter_m": {"type": "numeric", "absolute_tolerance": 0.05}}
29
Question29
PC300-029
Iceberg Boundary Perimeter
Calculate the total boundary length (m) of all exterior rings and interior holes in the supplied WGS84 iceberg polygon. Use shortest WGS84 ellipsoidal geodesics between adjacent vertices, sum all multipart components, and do not smooth the boundary. Return JSON containing only: perimeter_m. Do not append unit strings t...
true
Measurement and Counting
construction_candidate
[ "01_SARIB_V1_0180_20230228t180236_0_11_ninnisbank.geojson", "02_SARIB_V1_0180_20230228t180236_0_11_ninnisbank.tif" ]
Question29/task.json
{"perimeter_m": {"type": "numeric", "absolute_tolerance": 0.05}}
30
Question30
PC300-030
Convex-Hull Solidity of an Iceberg Outline
Transform the supplied WGS84 iceberg polygon to EPSG:3031, then calculate polygon_area_m2, convex_hull_area_m2, and their ratio solidity. Retain holes. These are geometric measures in the specified projection, not ellipsoidal areas. Return JSON containing only: polygon_area_m2, convex_hull_area_m2, solidity. Do not app...
true
Measurement and Counting
construction_candidate
[ "01_SARIB_V1_0641_20250325t180234_10_19_ninnisbank.geojson", "02_SARIB_V1_0641_20250325t180234_10_19_ninnisbank.tif" ]
Question30/task.json
{"polygon_area_m2": {"type": "numeric", "absolute_tolerance": 0.1}, "convex_hull_area_m2": {"type": "numeric", "absolute_tolerance": 0.1}, "solidity": {"type": "numeric", "absolute_tolerance": 1e-06}}
31
Question31
PC300-031
Convex-Hull Solidity of an Iceberg Outline
Transform the supplied WGS84 iceberg polygon to EPSG:3031, then calculate polygon_area_m2, convex_hull_area_m2, and their ratio solidity. Retain holes. These are geometric measures in the specified projection, not ellipsoidal areas. Return JSON containing only: polygon_area_m2, convex_hull_area_m2, solidity. Do not app...
true
Measurement and Counting
construction_candidate
[ "01_SARIB_V1_0122_20230216t180236_0_14_ninnisbank.geojson", "02_SARIB_V1_0122_20230216t180236_0_14_ninnisbank.tif" ]
Question31/task.json
{"polygon_area_m2": {"type": "numeric", "absolute_tolerance": 0.1}, "convex_hull_area_m2": {"type": "numeric", "absolute_tolerance": 0.1}, "solidity": {"type": "numeric", "absolute_tolerance": 1e-06}}
32
Question32
PC300-032
Ellipsoidal Iceberg Area
Given the real iceberg annotation polygon iceberg.geojson (WGS84 longitude and latitude), calculate its WGS84 ellipsoidal area, subtracting holes and summing multipart components. Do not substitute the bounding-box area. Return JSON with fields: area_km2. Submit only the requested results. Do not overwrite input files.
true
Measurement and Counting
construction_candidate
[ "01_iceberg.geojson" ]
Question32/task.json
{"area_km2": {"type": "numeric", "absolute_tolerance": 1e-05, "unit": "km2"}}
33
Question33
PC300-033
Linear-Power and dB Definitions of Regional SAR Means
The supplied raster contains SAR power in dB, already processed by the data provider. For all valid pixels, calculate mean_power_db by converting to linear power using 10^(dB/10), taking the arithmetic mean, and converting back to dB; calculate the direct dB mean as mean_db; return their difference as difference_db and...
true
Quantitative Remote Sensing Analysis
construction_candidate
[ "01_SARIB_V1_0658_20250403t110653_2_2.tif" ]
Question33/task.json
{"mean_power_db": {"type": "numeric", "absolute_tolerance": 1e-05}, "mean_db": {"type": "numeric", "absolute_tolerance": 1e-05}, "difference_db": {"type": "numeric", "absolute_tolerance": 1e-05}, "valid_pixels": {"type": "exact"}}
34
Question34
PC300-034
Linear-Power and dB Definitions of Regional SAR Means
The supplied raster contains SAR power in dB, already processed by the data provider. For all valid pixels, calculate mean_power_db by converting to linear power using 10^(dB/10), taking the arithmetic mean, and converting back to dB; calculate the direct dB mean as mean_db; return their difference as difference_db and...
true
Quantitative Remote Sensing Analysis
construction_candidate
[ "01_SARIB_V1_0591_20210222t152827_5_10_prydzbay.tif" ]
Question34/task.json
{"mean_power_db": {"type": "numeric", "absolute_tolerance": 1e-05}, "mean_db": {"type": "numeric", "absolute_tolerance": 1e-05}, "difference_db": {"type": "numeric", "absolute_tolerance": 1e-05}, "valid_pixels": {"type": "exact"}}
35
Question35
PC300-035
Linear-Power and dB Definitions of Regional SAR Means
For all valid pixels in db_patch.tif: (1) convert power dB to linear power using 10^(dB/10), take the arithmetic mean, and convert back using 10log10; report this as mean_power_db. (2) Calculate the arithmetic mean of the input dB values directly and report it as mean_db. (3) Subtract the latter from the former and rep...
true
Quantitative Remote Sensing Analysis
construction_candidate
[ "01_db_patch.tif" ]
Question35/task.json
{"mean_power_db": {"type": "numeric", "absolute_tolerance": 1e-06}, "mean_db": {"type": "numeric", "absolute_tolerance": 1e-06}, "difference_db": {"type": "numeric", "absolute_tolerance": 1e-06}, "valid_pixels": {"type": "exact"}}
36
Question36
PC300-036
Two-Observation Iceberg Displacement and Speed
Given 2 full-scene SAR images T0 through T1. The target is B09I; a loose search box is provided only for T0 in observation.json. Match the same iceberg from the images; do not treat the search box as the target boundary. Estimate all centers as the approximate geometric center of the complete visible iceberg body, excl...
true
Change Analysis
construction_candidate
[ "01_T0.tif", "02_T1.tif", "03_observation.json" ]
Question36/task.json
{"centres_colrow": {"type": "numeric_array", "absolute_tolerance": 30}, "distance_km": {"type": "numeric", "absolute_tolerance": 2.5}, "speed_km_day": {"type": "numeric", "absolute_tolerance": 0.4167004271179378}}
37
Question37
PC300-037
Nine-Cell Localization of the Largest Visible Iceberg
Where is the approximate body center of the iceberg with the largest visible area, potentially including a grounded iceberg? Divide the image width and height into three equal parts and answer using image-relative directions. A. Upper left B. Upper center C. Upper right D. Middle left E. Center F. Middle right G. Lower...
true
Recognition, Localization and Knowledge Interpretation
construction_candidate
[ "01_SARIB_V1_0347_20230324t180236_10_18_ninnisbank.png" ]
Question37/task.json
{"answer": {"type": "exact"}}
38
Question38
PC300-038
Nine-Cell Localization of the Largest Visible Iceberg
Where is the approximate body center of the iceberg with the largest visible area, potentially including a grounded iceberg? Divide the image width and height into three equal parts and answer using image-relative directions. A. Upper left B. Upper center C. Upper right D. Middle left E. Center F. Middle right G. Lower...
true
Recognition, Localization and Knowledge Interpretation
construction_candidate
[ "01_SARIB_V1_0440_20250209t042820_0_13_thwaite1.png" ]
Question38/task.json
{"answer": {"type": "exact"}}
39
Question39
PC300-039
Iceberg Area Distribution
Calculate WGS84 ellipsoidal areas for the supplied iceberg polygons and bin them into [0,0.01), [0.01,0.05), [0.05,0.1), [0.1,1), and [1,+∞) km². Return the count and fraction of the total iceberg area in each bin, in this order. Return JSON with fields: counts, area_fractions. Submit only the requested results. Do not...
true
Measurement and Counting
construction_candidate
[ "01_rgb.tif", "02_iceberg_objects.geojson" ]
Question39/task.json
{"counts": {"type": "exact"}, "area_fractions": {"type": "numeric_array", "absolute_tolerance": 1e-06}}
40
Question40
PC300-040
Two-Observation Iceberg Displacement and Speed
Locate iceberg B41 within the T0 search box and identify the same target in T1. Estimate its position from the geometric center of the complete target in each observation, then calculate WGS84 net displacement and average speed. Observation timestamps are given in observation.json. The search box is not an exact bounda...
true
Change Analysis
construction_candidate
[ "01_T0.tif", "02_T1.tif", "03_observation.json" ]
Question40/task.json
{"distance_km": {"type": "numeric", "absolute_tolerance": 1.0, "unit": "km"}, "speed_km_day": {"type": "numeric", "absolute_tolerance": 0.3, "unit": "km/day"}}
41
Question41
PC300-041
Path Length and Net Displacement of a Supplied Track
For the 12 date-ordered positions of A20A, connect adjacent positions by shortest WGS84 geodesics. Calculate the sampled polyline length (km), first-to-last net displacement (km), their ratio, path length divided by total calendar days, and net displacement divided by total calendar days (km/day). The original data pro...
true
Change Analysis
construction_candidate
[ "01_a20a.json" ]
Question41/task.json
{"path_length_km": {"type": "numeric", "absolute_tolerance": 0.001}, "net_displacement_km": {"type": "numeric", "absolute_tolerance": 0.001}, "path_to_net_ratio": {"type": "numeric", "absolute_tolerance": 1e-06}, "path_speed_km_day": {"type": "numeric", "absolute_tolerance": 0.001}, "net_speed_km_day": {"type": "numeri...
42
Question42
PC300-042
Path Length and Net Displacement of a Supplied Track
For the 12 date-ordered positions of A25, connect adjacent positions by shortest WGS84 geodesics. Calculate the sampled polyline length (km), first-to-last net displacement (km), their ratio, path length divided by total calendar days, and net displacement divided by total calendar days (km/day). The original data prov...
true
Change Analysis
construction_candidate
[ "01_a25.json" ]
Question42/task.json
{"path_length_km": {"type": "numeric", "absolute_tolerance": 0.001}, "net_displacement_km": {"type": "numeric", "absolute_tolerance": 0.001}, "path_to_net_ratio": {"type": "numeric", "absolute_tolerance": 1e-06}, "path_speed_km_day": {"type": "numeric", "absolute_tolerance": 0.001}, "net_speed_km_day": {"type": "numeri...
43
Question43
PC300-043
Path Length and Net Displacement of a Supplied Track
For the 12 date-ordered positions of A23A, connect adjacent positions by shortest WGS84 geodesics. Calculate the sampled polyline length (km), first-to-last net displacement (km), their ratio, path length divided by total calendar days, and net displacement divided by total calendar days (km/day). The original data pro...
true
Change Analysis
construction_candidate
[ "01_a23a.json" ]
Question43/task.json
{"path_length_km": {"type": "numeric", "absolute_tolerance": 0.001}, "net_displacement_km": {"type": "numeric", "absolute_tolerance": 0.001}, "path_to_net_ratio": {"type": "numeric", "absolute_tolerance": 1e-06}, "path_speed_km_day": {"type": "numeric", "absolute_tolerance": 0.001}, "net_speed_km_day": {"type": "numeri...
44
Question44
PC300-044
Observed Time Interval of Iceberg Region Entry
Using the supplied position sequence for A27 and WGS84 region R, determine whether each observation lies within R, including its boundary. To avoid longitude wrapping at 180°, transform both the points and R into the supplied local projection before testing: +proj=aeqd +lat_0=-75.6498 +lon_0=-41.3525 +datum=WGS84 +unit...
true
Change Analysis
construction_candidate
[ "01_a27.json", "02_a27_region.geojson" ]
Question44/task.json
{"inside": {"type": "exact"}, "first_inside_date": {"type": "exact"}, "last_outside_date": {"type": "exact"}}
45
Question45
PC300-045
Observed Time Interval of Iceberg Region Entry
Using the supplied position sequence for A35 and WGS84 region R, determine whether each observation lies within R, including its boundary. To avoid longitude wrapping at 180°, transform both the points and R into the supplied local projection before testing: +proj=aeqd +lat_0=-65.7022 +lon_0=84.9146 +datum=WGS84 +units...
true
Change Analysis
construction_candidate
[ "01_a35.json", "02_a35_region.geojson" ]
Question45/task.json
{"inside": {"type": "exact"}, "first_inside_date": {"type": "exact"}, "last_outside_date": {"type": "exact"}}
46
Question46
PC300-046
Observed Time Interval of Iceberg Region Entry
Using the supplied position sequence for A36 and WGS84 region R, determine whether each observation lies within R, including its boundary. To avoid longitude wrapping at 180°, transform both the points and R into the supplied local projection before testing: +proj=aeqd +lat_0=-71.02 +lon_0=-59.6031 +datum=WGS84 +units=...
true
Change Analysis
construction_candidate
[ "01_a36.json", "02_a36_region.geojson" ]
Question46/task.json
{"inside": {"type": "exact"}, "first_inside_date": {"type": "exact"}, "last_outside_date": {"type": "exact"}}
47
Question47
PC300-047
Discernible Boundary and Area of a Specified Iceberg
Delineate the complete boundary of the main iceberg within search_box.geojson and return the WGS84 GeoJSON file path and ellipsoidal area. The search box is a location hint, not the target boundary. Return JSON with fields: boundary, area_km2. Submit only the requested results. Do not overwrite input files.
true
Segmentation and Spatial Structure Analysis
construction_candidate
[ "01_rgb.tif", "02_search_box.geojson" ]
Question47/task.json
{"boundary": {"type": "geometry", "iou_threshold": 0.8}, "area_km2": {"type": "numeric", "absolute_tolerance": 0.015980560053325443, "unit": "km2"}}
48
Question48
PC300-048
Counting Fully Visible Icebergs
Count independent, fully visible icebergs with visible areas of at least 4 original pixels. Exclude targets truncated by the image boundary. Do not count bright patches within one iceberg as separate objects. Return only a nonnegative integer.
true
Measurement and Counting
construction_candidate
[ "01_rgb.tif" ]
Question48/task.json
{"answer": {"type": "exact"}}
49
Question49
PC300-049
Path Length and Net Displacement of a Supplied Track
For the 12 date-ordered positions of A31, connect adjacent positions by shortest WGS84 geodesics. Calculate the sampled polyline length (km), first-to-last net displacement (km), their ratio, path length divided by total calendar days, and net displacement divided by total calendar days (km/day). The original data prov...
true
Change Analysis
construction_candidate
[ "01_a31.json" ]
Question49/task.json
{"path_length_km": {"type": "numeric", "absolute_tolerance": 0.001}, "net_displacement_km": {"type": "numeric", "absolute_tolerance": 0.001}, "path_to_net_ratio": {"type": "numeric", "absolute_tolerance": 1e-06}, "path_speed_km_day": {"type": "numeric", "absolute_tolerance": 0.001}, "net_speed_km_day": {"type": "numeri...
50
Question50
PC300-050
Path Length and Net Displacement of a Supplied Track
For the 12 date-ordered positions of A34A, connect adjacent positions by shortest WGS84 geodesics. Calculate the sampled polyline length (km), first-to-last net displacement (km), their ratio, path length divided by total calendar days, and net displacement divided by total calendar days (km/day). The original data pro...
true
Change Analysis
construction_candidate
[ "01_a34a.json" ]
Question50/task.json
{"path_length_km": {"type": "numeric", "absolute_tolerance": 0.001}, "net_displacement_km": {"type": "numeric", "absolute_tolerance": 0.001}, "path_to_net_ratio": {"type": "numeric", "absolute_tolerance": 1e-06}, "path_speed_km_day": {"type": "numeric", "absolute_tolerance": 0.001}, "net_speed_km_day": {"type": "numeri...
51
Question51
PC300-051
Path Length and Net Displacement of a Supplied Track
For the 12 date-ordered positions of A29, connect adjacent positions by shortest WGS84 geodesics. Calculate the sampled polyline length (km), first-to-last net displacement (km), their ratio, path length divided by total calendar days, and net displacement divided by total calendar days (km/day). The original data prov...
true
Change Analysis
construction_candidate
[ "01_a29.json" ]
Question51/task.json
{"path_length_km": {"type": "numeric", "absolute_tolerance": 0.001}, "net_displacement_km": {"type": "numeric", "absolute_tolerance": 0.001}, "path_to_net_ratio": {"type": "numeric", "absolute_tolerance": 1e-06}, "path_speed_km_day": {"type": "numeric", "absolute_tolerance": 0.001}, "net_speed_km_day": {"type": "numeri...
52
Question52
PC300-052
Observed Time Interval of Iceberg Region Entry
Using the supplied position sequence for A35B and WGS84 region R, determine whether each observation lies within R, including its boundary. To avoid longitude wrapping at 180°, transform both the points and R into the supplied local projection before testing: +proj=aeqd +lat_0=-74.0459 +lon_0=-47.8608 +datum=WGS84 +uni...
true
Change Analysis
construction_candidate
[ "01_a35b.json", "02_a35b_region.geojson" ]
Question52/task.json
{"inside": {"type": "exact"}, "first_inside_date": {"type": "exact"}, "last_outside_date": {"type": "exact"}}
53
Question53
PC300-053
Observed Time Interval of Iceberg Region Entry
Using the supplied position sequence for A20 and WGS84 region R, determine whether each observation lies within R, including its boundary. To avoid longitude wrapping at 180°, transform both the points and R into the supplied local projection before testing: +proj=aeqd +lat_0=-65.5 +lon_0=-58.2 +datum=WGS84 +units=m. R...
true
Change Analysis
construction_candidate
[ "01_a20.json", "02_a20_region.geojson" ]
Question53/task.json
{"inside": {"type": "exact"}, "first_inside_date": {"type": "exact"}, "last_outside_date": {"type": "exact"}}
54
Question54
PC300-054
Observed Time Interval of Iceberg Region Entry
Using the supplied position sequence for A32A and WGS84 region R, determine whether each observation lies within R, including its boundary. To avoid longitude wrapping at 180°, transform both the points and R into the supplied local projection before testing: +proj=aeqd +lat_0=-64.9505 +lon_0=-56.6183 +datum=WGS84 +uni...
true
Change Analysis
construction_candidate
[ "01_a32a.json", "02_a32a_region.geojson" ]
Question54/task.json
{"inside": {"type": "exact"}, "first_inside_date": {"type": "exact"}, "last_outside_date": {"type": "exact"}}
55
Question55
PC300-055
Path Length and Net Displacement of a Supplied Track
For the 12 date-ordered positions of A01, connect adjacent positions by shortest WGS84 geodesics. Calculate the sampled polyline length (km), first-to-last net displacement (km), their ratio, path length divided by total calendar days, and net displacement divided by total calendar days (km/day). The original data prov...
true
Change Analysis
construction_candidate
[ "01_a01.json" ]
Question55/task.json
{"path_length_km": {"type": "numeric", "absolute_tolerance": 0.001}, "net_displacement_km": {"type": "numeric", "absolute_tolerance": 0.001}, "path_to_net_ratio": {"type": "numeric", "absolute_tolerance": 1e-06}, "path_speed_km_day": {"type": "numeric", "absolute_tolerance": 0.001}, "net_speed_km_day": {"type": "numeri...
56
Question56
PC300-056
Path Length and Net Displacement of a Supplied Track
For the 12 date-ordered positions of A28, connect adjacent positions by shortest WGS84 geodesics. Calculate the sampled polyline length (km), first-to-last net displacement (km), their ratio, path length divided by total calendar days, and net displacement divided by total calendar days (km/day). The original data prov...
true
Change Analysis
construction_candidate
[ "01_a28.json" ]
Question56/task.json
{"path_length_km": {"type": "numeric", "absolute_tolerance": 0.001}, "net_displacement_km": {"type": "numeric", "absolute_tolerance": 0.001}, "path_to_net_ratio": {"type": "numeric", "absolute_tolerance": 1e-06}, "path_speed_km_day": {"type": "numeric", "absolute_tolerance": 0.001}, "net_speed_km_day": {"type": "numeri...
57
Question57
PC300-057
Path Length and Net Displacement of a Supplied Track
For the 12 date-ordered positions of A23B, connect adjacent positions by shortest WGS84 geodesics. Calculate the sampled polyline length (km), first-to-last net displacement (km), their ratio, path length divided by total calendar days, and net displacement divided by total calendar days (km/day). The original data pro...
true
Change Analysis
construction_candidate
[ "01_a23b.json" ]
Question57/task.json
{"path_length_km": {"type": "numeric", "absolute_tolerance": 0.001}, "net_displacement_km": {"type": "numeric", "absolute_tolerance": 0.001}, "path_to_net_ratio": {"type": "numeric", "absolute_tolerance": 1e-06}, "path_speed_km_day": {"type": "numeric", "absolute_tolerance": 0.001}, "net_speed_km_day": {"type": "numeri...
58
Question58
PC300-058
Observed Time Interval of Iceberg Region Entry
Using the supplied position sequence for A24 and WGS84 region R, determine whether each observation lies within R, including its boundary. To avoid longitude wrapping at 180°, transform both the points and R into the supplied local projection before testing: +proj=aeqd +lat_0=-60.9 +lon_0=-51.9 +datum=WGS84 +units=m. R...
true
Change Analysis
construction_candidate
[ "01_a24.json", "02_a24_region.geojson" ]
Question58/task.json
{"inside": {"type": "exact"}, "first_inside_date": {"type": "exact"}, "last_outside_date": {"type": "exact"}}
59
Question59
PC300-059
Observed Time Interval of Iceberg Region Entry
Using the supplied position sequence for A22C and WGS84 region R, determine whether each observation lies within R, including its boundary. To avoid longitude wrapping at 180°, transform both the points and R into the supplied local projection before testing: +proj=aeqd +lat_0=-61.6759 +lon_0=-40.0738 +datum=WGS84 +uni...
true
Change Analysis
construction_candidate
[ "01_a22c.json", "02_a22c_region.geojson" ]
Question59/task.json
{"inside": {"type": "exact"}, "first_inside_date": {"type": "exact"}, "last_outside_date": {"type": "exact"}}
60
Question60
PC300-060
Observed Time Interval of Iceberg Region Entry
Using the supplied position sequence for A22B and WGS84 region R, determine whether each observation lies within R, including its boundary. To avoid longitude wrapping at 180°, transform both the points and R into the supplied local projection before testing: +proj=aeqd +lat_0=-61.1331 +lon_0=-49.0461 +datum=WGS84 +uni...
true
Change Analysis
construction_candidate
[ "01_a22b.json", "02_a22b_region.geojson" ]
Question60/task.json
{"inside": {"type": "exact"}, "first_inside_date": {"type": "exact"}, "last_outside_date": {"type": "exact"}}
61
Question61
PC300-061
Path Length and Net Displacement of a Supplied Track
For the 12 date-ordered positions of A02, connect adjacent positions by shortest WGS84 geodesics. Calculate the sampled polyline length (km), first-to-last net displacement (km), their ratio, path length divided by total calendar days, and net displacement divided by total calendar days (km/day). The original data prov...
true
Change Analysis
construction_candidate
[ "01_a02.json" ]
Question61/task.json
{"path_length_km": {"type": "numeric", "absolute_tolerance": 0.001}, "net_displacement_km": {"type": "numeric", "absolute_tolerance": 0.001}, "path_to_net_ratio": {"type": "numeric", "absolute_tolerance": 1e-06}, "path_speed_km_day": {"type": "numeric", "absolute_tolerance": 0.001}, "net_speed_km_day": {"type": "numeri...
62
Question62
PC300-062
Path Length and Net Displacement of a Supplied Track
For the 12 date-ordered positions of A22, connect adjacent positions by shortest WGS84 geodesics. Calculate the sampled polyline length (km), first-to-last net displacement (km), their ratio, path length divided by total calendar days, and net displacement divided by total calendar days (km/day). The original data prov...
true
Change Analysis
construction_candidate
[ "01_a22.json" ]
Question62/task.json
{"path_length_km": {"type": "numeric", "absolute_tolerance": 0.001}, "net_displacement_km": {"type": "numeric", "absolute_tolerance": 0.001}, "path_to_net_ratio": {"type": "numeric", "absolute_tolerance": 1e-06}, "path_speed_km_day": {"type": "numeric", "absolute_tolerance": 0.001}, "net_speed_km_day": {"type": "numeri...
63
Question63
PC300-063
Path Length and Net Displacement of a Supplied Track
For the 12 date-ordered positions of A38A, connect adjacent positions by shortest WGS84 geodesics. Calculate the sampled polyline length (km), first-to-last net displacement (km), their ratio, path length divided by total calendar days, and net displacement divided by total calendar days (km/day). The original data pro...
true
Change Analysis
construction_candidate
[ "01_a38a.json" ]
Question63/task.json
{"path_length_km": {"type": "numeric", "absolute_tolerance": 0.001}, "net_displacement_km": {"type": "numeric", "absolute_tolerance": 0.001}, "path_to_net_ratio": {"type": "numeric", "absolute_tolerance": 1e-06}, "path_speed_km_day": {"type": "numeric", "absolute_tolerance": 0.001}, "net_speed_km_day": {"type": "numeri...
64
Question64
PC300-064
Observed Time Interval of Iceberg Region Entry
Using the supplied position sequence for A32 and WGS84 region R, determine whether each observation lies within R, including its boundary. To avoid longitude wrapping at 180°, transform both the points and R into the supplied local projection before testing: +proj=aeqd +lat_0=-68.7583 +lon_0=-59.2849 +datum=WGS84 +unit...
true
Change Analysis
construction_candidate
[ "01_a32.json", "02_a32_region.geojson" ]
Question64/task.json
{"inside": {"type": "exact"}, "first_inside_date": {"type": "exact"}, "last_outside_date": {"type": "exact"}}
65
Question65
PC300-065
Observed Time Interval of Iceberg Region Entry
Using the supplied position sequence for A23 and WGS84 region R, determine whether each observation lies within R, including its boundary. To avoid longitude wrapping at 180°, transform both the points and R into the supplied local projection before testing: +proj=aeqd +lat_0=-76.8 +lon_0=-42.2 +datum=WGS84 +units=m. R...
true
Change Analysis
construction_candidate
[ "01_a23.json", "02_a23_region.geojson" ]
Question65/task.json
{"inside": {"type": "exact"}, "first_inside_date": {"type": "exact"}, "last_outside_date": {"type": "exact"}}
66
Question66
PC300-066
Observed Time Interval of Iceberg Region Entry
Using the supplied position sequence for A16 and WGS84 region R, determine whether each observation lies within R, including its boundary. To avoid longitude wrapping at 180°, transform both the points and R into the supplied local projection before testing: +proj=aeqd +lat_0=-55.2 +lon_0=-38.9 +datum=WGS84 +units=m. R...
true
Change Analysis
construction_candidate
[ "01_a16.json", "02_a16_region.geojson" ]
Question66/task.json
{"inside": {"type": "exact"}, "first_inside_date": {"type": "exact"}, "last_outside_date": {"type": "exact"}}
67
Question67
PC300-067
Path Length and Net Displacement of a Supplied Track
Using the four positions in positions.json, calculate the sum of adjacent-point WGS84 geodesic distances, first-to-last net displacement, and their ratio. The polyline length represents only the discretely sampled path, not the true continuous trajectory length. Return JSON with fields: sampled_path_km, net_distance_km...
true
Change Analysis
construction_candidate
[ "01_T0.tif", "02_T1.tif", "03_T2.tif", "04_T3.tif", "05_positions.json" ]
Question67/task.json
{"sampled_path_km": {"type": "numeric", "absolute_tolerance": 0.001, "unit": "km"}, "net_distance_km": {"type": "numeric", "absolute_tolerance": 0.001, "unit": "km"}, "tortuosity": {"type": "numeric", "absolute_tolerance": 1e-05}}
68
Question68
PC300-068
Presence of a Visible Iceberg
Is there a clearly visible iceberg in the image? A. Yes B. No Select one option and return only its letter.
true
Recognition, Localization and Knowledge Interpretation
construction_candidate
[ "01_I02_006.png" ]
Question68/task.json
{"answer": {"type": "exact"}}
69
Question69
PC300-069
Convex-Hull Solidity of an Iceberg Outline
Transform the supplied WGS84 iceberg polygon to EPSG:3031, then calculate polygon_area_m2, convex_hull_area_m2, and their ratio solidity. Retain holes. These are geometric measures in the specified projection, not ellipsoidal areas. Return JSON containing only: polygon_area_m2, convex_hull_area_m2, solidity. Do not app...
true
Measurement and Counting
construction_candidate
[ "01_SARIB_V1_0521_20250323t181854_10_18_ninnisbank.geojson", "02_SARIB_V1_0521_20250323t181854_10_18_ninnisbank.tif" ]
Question69/task.json
{"polygon_area_m2": {"type": "numeric", "absolute_tolerance": 0.1}, "convex_hull_area_m2": {"type": "numeric", "absolute_tolerance": 0.1}, "solidity": {"type": "numeric", "absolute_tolerance": 1e-06}}
70
Question70
PC300-070
Ellipsoidal Iceberg Area
Calculate the WGS84 ellipsoidal area (km²) of the supplied iceberg polygon, with longitude preceding latitude. Subtract holes and sum multipart components. The image is provided only for contextual inspection. Return JSON containing only: area_km2. Do not append unit strings to numeric values. Use actual output paths f...
true
Measurement and Counting
construction_candidate
[ "01_SARIB_V1_0017_20210306t152827_8_5_prydzbay.geojson", "02_SARIB_V1_0017_20210306t152827_8_5_prydzbay.tif" ]
Question70/task.json
{"area_km2": {"type": "numeric", "absolute_tolerance": 1e-05}}
71
Question71
PC300-071
Ellipsoidal Iceberg Area
Calculate the WGS84 ellipsoidal area (km²) of the supplied iceberg polygon, with longitude preceding latitude. Subtract holes and sum multipart components. The image is provided only for contextual inspection. Return JSON containing only: area_km2. Do not append unit strings to numeric values. Use actual output paths f...
true
Measurement and Counting
construction_candidate
[ "01_SARIB_V1_0027_20210312t112234_4_19_porpoisebay.geojson", "02_SARIB_V1_0027_20210312t112234_4_19_porpoisebay.tif" ]
Question71/task.json
{"area_km2": {"type": "numeric", "absolute_tolerance": 1e-05}}
72
Question72
PC300-072
Nine-Cell Localization of the Largest Visible Iceberg
Where is the approximate body center of the iceberg with the largest visible area, potentially including a grounded iceberg? Divide the image width and height into three equal parts and answer using image-relative directions. A. Upper left B. Upper center C. Upper right D. Middle left E. Center F. Middle right G. Lower...
true
Recognition, Localization and Knowledge Interpretation
construction_candidate
[ "01_SARIB_V1_0086_20250403t192707_2_1_marthacoast.png" ]
Question72/task.json
{"answer": {"type": "exact"}}
73
Question73
PC300-073
Continuous Tracking, Turning, and Detour Analysis
Given 3 full-scene Sentinel-1 SAR images, order them by the timestamps in observation.json. A loose search box for B46 is provided only for the first observation. Identify the same iceberg in each image and estimate the approximate geometric center of its complete body, excluding shadows. Return centres_colrow for ever...
true
Change Analysis
construction_candidate
[ "01_T0.tif", "02_T1.tif", "03_T2.tif", "04_observation.json" ]
Question73/task.json
{"centres_colrow": {"type": "numeric_array", "absolute_tolerance": 30}, "turn_angles_deg": {"type": "numeric_array", "absolute_tolerance": 15}, "segment_speeds_km_day": {"type": "numeric_array", "absolute_tolerance": 0.4167004271179378}, "sampled_path_km": {"type": "numeric", "absolute_tolerance": 5.0}, "net_distance_k...
74
Question74
PC300-074
Continuous Tracking, Turning, and Detour Analysis
Given 3 full-scene Sentinel-1 SAR images, order them by the timestamps in observation.json. A loose search box for B15Z is provided only for the first observation. Identify the same iceberg in each image and estimate the approximate geometric center of its complete body, excluding shadows. Return centres_colrow for eve...
true
Change Analysis
construction_candidate
[ "01_T0.tif", "02_T1.tif", "03_T2.tif", "04_observation.json" ]
Question74/task.json
{"centres_colrow": {"type": "numeric_array", "absolute_tolerance": 30}, "turn_angles_deg": {"type": "numeric_array", "absolute_tolerance": 15}, "segment_speeds_km_day": {"type": "numeric_array", "absolute_tolerance": 0.49942081058772114}, "sampled_path_km": {"type": "numeric", "absolute_tolerance": 5.0}, "net_distance_...
75
Question75
PC300-075
Segment-Wise Iceberg Speed Changes
Given 3 full-scene SAR images T0 through T2. The target is C32; a loose search box is provided only for T0 in observation.json. Match the same iceberg from the images; do not treat the search box as the target boundary. Estimate all centers as the approximate geometric center of the complete visible iceberg body, exclu...
true
Change Analysis
construction_candidate
[ "01_T0.tif", "02_T1.tif", "03_T2.tif", "04_observation.json" ]
Question75/task.json
{"centres_colrow": {"type": "numeric_array", "absolute_tolerance": 30}, "segment_distances_km": {"type": "numeric_array", "absolute_tolerance": 2.5}, "segment_speeds_km_day": {"type": "numeric_array", "absolute_tolerance": 0.4167004271179378}}
76
Question76
PC300-076
Segment-Wise Iceberg Speed Changes
Given 4 full-scene SAR images T0 through T3. The target is A68B; a loose search box is provided only for T0 in observation.json. Match the same iceberg from the images; do not treat the search box as the target boundary. Estimate all centers as the approximate geometric center of the complete visible iceberg body, excl...
true
Change Analysis
construction_candidate
[ "01_T0.tif", "02_T1.tif", "03_T2.tif", "04_T3.tif", "05_observation.json" ]
Question76/task.json
{"centres_colrow": {"type": "numeric_array", "absolute_tolerance": 30}, "segment_distances_km": {"type": "numeric_array", "absolute_tolerance": 2.5}, "segment_speeds_km_day": {"type": "numeric_array", "absolute_tolerance": 0.49942081058772114}}
77
Question77
PC300-077
Iceberg Displacement and Principal-Axis Change
Match B41, indicated in observation.json, between the two 40 m SAR crops; segment the bright body and exclude shadows. Calculate the area-centroid displacement dx and dy in the common EPSG:3031 projection. Define the principal axis as the eigenvector with the largest eigenvalue of the covariance matrix of iceberg-body ...
true
Change Analysis
construction_candidate
[ "01_B41_T0.tif", "02_B41_T1.tif", "03_B41_observation.json" ]
Question77/task.json
{"matched_object": {"type": "exact"}, "dx_m": {"type": "numeric", "absolute_tolerance": 1000, "unit": "m"}, "dy_m": {"type": "numeric", "absolute_tolerance": 1000, "unit": "m"}, "orientation_status": {"type": "exact"}, "axis_change_deg": {"type": "exact"}}
78
Question78
PC300-078
Two-Observation Iceberg Displacement and Speed
Given 2 full-scene SAR images T0 through T1. The target is B42; a loose search box is provided only for T0 in observation.json. Match the same iceberg from the images; do not treat the search box as the target boundary. Estimate all centers as the approximate geometric center of the complete visible iceberg body, exclu...
true
Change Analysis
construction_candidate
[ "01_T0.tif", "02_T1.tif", "03_observation.json" ]
Question78/task.json
{"centres_colrow": {"type": "numeric_array", "absolute_tolerance": 30}, "distance_km": {"type": "numeric", "absolute_tolerance": 2.5}, "speed_km_day": {"type": "numeric", "absolute_tolerance": 0.4166337153118677}}
79
Question79
PC300-079
Nearest Distance Between Icebergs
Given iceberg polygons derived from this scene's manual annotations, identify the closest pair using area centroids in EPSG:32627 and calculate their planar distance. Use the GeoJSON id as the object identifier. Do not use distances between boundaries. Return JSON with fields: object_ids, distance_m. Submit only the re...
true
Measurement and Counting
construction_candidate
[ "01_rgb.tif", "02_iceberg_objects.geojson" ]
Question79/task.json
{"object_ids": {"type": "set"}, "distance_m": {"type": "numeric", "absolute_tolerance": 0.01, "unit": "m"}}
80
Question80
PC300-080
Discernible Boundary and Area of a Specified Iceberg
Delineate the actual boundary of the largest complete iceberg within the search box, including grounded icebergs, and output WGS84 GeoJSON and ellipsoidal area (km²). The search box is only a location hint; do not use it as the target boundary. Retain visible holes. Return JSON containing only: boundary, area_km2. Do n...
true
Segmentation and Spatial Structure Analysis
construction_candidate
[ "01_SARIB_V1_0122_20230216t180236_0_14_ninnisbank.tif", "02_SARIB_V1_0122_20230216t180236_0_14_ninnisbank_search.geojson" ]
Question80/task.json
{"boundary": {"type": "geometry", "iou_threshold": 0.8}, "area_km2": {"type": "numeric", "absolute_tolerance": 0.05448862087091804}}
81
Question81
PC300-081
Dual-Polarization Sea-Ice Segmentation
Given HH and HV SAR quicklook images of the same sea area. Segment sea ice and output a 512×512 single-band uint8 TIFF: 1=ice and 0=water. Preserve the original pixel grid; do not invent a CRS if none is provided. Quicklook grayscale values are not calibrated dB values. Interpret the two images jointly. Return only JSO...
true
Segmentation and Spatial Structure Analysis
construction_candidate
[ "01_hh.tif", "02_hv.tif" ]
Question81/task.json
{"ice_mask": {"type": "mask", "absolute_tolerance": 0, "iou_threshold": 0.7}}
82
Question82
PC300-082
Dual-Polarization Sea-Ice Segmentation
Given HH and HV SAR quicklook images of the same sea area. Segment sea ice and output a 512×512 single-band uint8 TIFF: 1=ice and 0=water. Preserve the original pixel grid; do not invent a CRS if none is provided. Quicklook grayscale values are not calibrated dB values. Interpret the two images jointly. Return only JSO...
true
Segmentation and Spatial Structure Analysis
construction_candidate
[ "01_hh.tif", "02_hv.tif" ]
Question82/task.json
{"ice_mask": {"type": "mask", "absolute_tolerance": 0, "iou_threshold": 0.7}}
83
Question83
PC300-083
Dual-Polarization Sea-Ice Segmentation
Given HH and HV SAR quicklook images of the same sea area. Segment sea ice and output a 512×512 single-band uint8 TIFF: 1=ice and 0=water. Preserve the original pixel grid; do not invent a CRS if none is provided. Quicklook grayscale values are not calibrated dB values. Interpret the two images jointly. Return only JSO...
true
Segmentation and Spatial Structure Analysis
construction_candidate
[ "01_hh.tif", "02_hv.tif" ]
Question83/task.json
{"ice_mask": {"type": "mask", "absolute_tolerance": 0, "iou_threshold": 0.7}}
84
Question84
PC300-084
Seasonal Sea-Ice Extrema and Amplitude
Using the 12 monthly products for 2021, calculate monthly-field-derived sea-ice extent with SIC≥15% over the supplied common valid domain for the entire year. raw/1000 is a fraction; use the supplied area weights. Return the months with maximum and minimum extent, retaining all ties within 0.1 km², and the maximum-minu...
true
Change Analysis
construction_candidate
[ "01_N_202101_concentration_v4.0.tif", "02_N_202102_concentration_v4.0.tif", "03_N_202103_concentration_v4.0.tif", "04_N_202104_concentration_v4.0.tif", "05_N_202105_concentration_v4.0.tif", "06_N_202106_concentration_v4.0.tif", "07_N_202107_concentration_v4.0.tif", "08_N_202108_concentration_v4.0.tif"...
Question84/task.json
{"maximum_months": {"type": "set"}, "minimum_months": {"type": "set"}, "amplitude_km2": {"type": "numeric", "absolute_tolerance": 0.1}}
85
Question85
PC300-085
Seasonal Sea-Ice Extrema and Amplitude
Using the 12 monthly products for 2020, calculate monthly-field-derived sea-ice extent with SIC≥15% over the supplied common valid domain for the entire year. raw/1000 is a fraction; use the supplied area weights. Return the months with maximum and minimum extent, retaining all ties within 0.1 km², and the maximum-minu...
true
Change Analysis
construction_candidate
[ "01_S_202001_concentration_v4.0.tif", "02_S_202002_concentration_v4.0.tif", "03_S_202003_concentration_v4.0.tif", "04_S_202004_concentration_v4.0.tif", "05_S_202005_concentration_v4.0.tif", "06_S_202006_concentration_v4.0.tif", "07_S_202007_concentration_v4.0.tif", "08_S_202008_concentration_v4.0.tif"...
Question85/task.json
{"maximum_months": {"type": "set"}, "minimum_months": {"type": "set"}, "amplitude_km2": {"type": "numeric", "absolute_tolerance": 0.1}}
86
Question86
PC300-086
Seasonal Sea-Ice Extrema and Amplitude
Using the 12 monthly products for 2025, calculate monthly-field-derived sea-ice extent with SIC≥15% over the supplied common valid domain for the entire year. raw/1000 is a fraction; use the supplied area weights. Return the months with maximum and minimum extent, retaining all ties within 0.1 km², and the maximum-minu...
true
Change Analysis
construction_candidate
[ "01_S_202501_concentration_v4.0.tif", "02_S_202502_concentration_v4.0.tif", "03_S_202503_concentration_v4.0.tif", "04_S_202504_concentration_v4.0.tif", "05_S_202505_concentration_v4.0.tif", "06_S_202506_concentration_v4.0.tif", "07_S_202507_concentration_v4.0.tif", "08_S_202508_concentration_v4.0.tif"...
Question86/task.json
{"maximum_months": {"type": "set"}, "minimum_months": {"type": "set"}, "amplitude_km2": {"type": "numeric", "absolute_tolerance": 0.1}}
87
Question87
PC300-087
Sea-Ice Gains and Losses on Common Support
Compare SIC in months 3 and 9 of 2025 over the supplied common valid domain. With a 15% threshold, create a four-state change map: 0=below threshold in both, 1=at or above threshold in both, 2=newly at or above threshold, 3=no longer at or above threshold, and 255=invalid. raw/1000 is a fraction. Output a uint8 GeoTIFF...
true
Change Analysis
construction_candidate
[ "01_N_202503_concentration_v4.0.tif", "02_N_202509_concentration_v4.0.tif", "03_N_cell_area_km2.tif", "04_N_2025_common.tif" ]
Question87/task.json
{"transition_tif": {"type": "raster"}, "gain_km2": {"type": "numeric", "absolute_tolerance": 0.1}, "loss_km2": {"type": "numeric", "absolute_tolerance": 0.1}, "mean_change_pp": {"type": "numeric", "absolute_tolerance": 1e-05}}
88
Question88
PC300-088
Sea-Ice Gains and Losses on Common Support
Compare SIC in months 3 and 9 of 2022 over the supplied common valid domain. With a 15% threshold, create a four-state change map: 0=below threshold in both, 1=at or above threshold in both, 2=newly at or above threshold, 3=no longer at or above threshold, and 255=invalid. raw/1000 is a fraction. Output a uint8 GeoTIFF...
true
Change Analysis
construction_candidate
[ "01_N_202203_concentration_v4.0.tif", "02_N_202209_concentration_v4.0.tif", "03_N_cell_area_km2.tif", "04_N_2019_mar_sep_common.tif" ]
Question88/task.json
{"transition_tif": {"type": "raster"}, "gain_km2": {"type": "numeric", "absolute_tolerance": 0.1}, "loss_km2": {"type": "numeric", "absolute_tolerance": 0.1}, "mean_change_pp": {"type": "numeric", "absolute_tolerance": 1e-05}}
89
Question89
PC300-089
Sea-Ice Gains and Losses on Common Support
Compare SIC in months 3 and 9 of 2021 over the supplied common valid domain. With a 15% threshold, create a four-state change map: 0=below threshold in both, 1=at or above threshold in both, 2=newly at or above threshold, 3=no longer at or above threshold, and 255=invalid. raw/1000 is a fraction. Output a uint8 GeoTIFF...
true
Change Analysis
construction_candidate
[ "01_S_202103_concentration_v4.0.tif", "02_S_202109_concentration_v4.0.tif", "03_S_cell_area_km2.tif", "04_S_201903_valid.tif" ]
Question89/task.json
{"transition_tif": {"type": "raster"}, "gain_km2": {"type": "numeric", "absolute_tolerance": 0.1}, "loss_km2": {"type": "numeric", "absolute_tolerance": 0.1}, "mean_change_pp": {"type": "numeric", "absolute_tolerance": 1e-05}}
90
Question90
PC300-090
Monthly Sea-Ice Persistence and First-Occurrence Mapping
Given Southern Hemisphere monthly sea-ice products for months 1 through 12 of 2019 and ellipsoidal pixel areas in km². Decode raw values 0–1000 by dividing by 1000 to obtain concentration. Treat all other codes and file-masked pixels as invalid. 0 denotes valid ice-free water. Restrict analysis to pixels valid in all 1...
true
Change Analysis
construction_candidate
[ "01_S_201901_concentration_v4.0.tif", "02_S_201902_concentration_v4.0.tif", "03_S_201903_concentration_v4.0.tif", "04_S_201904_concentration_v4.0.tif", "05_S_201905_concentration_v4.0.tif", "06_S_201906_concentration_v4.0.tif", "07_S_201907_concentration_v4.0.tif", "08_S_201908_concentration_v4.0.tif"...
Question90/task.json
{"persistence_tif": {"type": "raster"}, "longest_run_areas_km2": {"type": "numeric_array", "absolute_tolerance": 0.5}, "at_least_six_month_fraction": {"type": "numeric", "absolute_tolerance": 1e-05}}
91
Question91
PC300-091
Monthly Sea-Ice Persistence and First-Occurrence Mapping
Given Northern Hemisphere monthly sea-ice products for months 1 through 12 of 2020 and ellipsoidal pixel areas in km². Decode raw values 0–1000 by dividing by 1000 to obtain concentration. Treat all other codes and file-masked pixels as invalid. 0 denotes valid ice-free water. Restrict analysis to pixels valid in all 1...
true
Change Analysis
construction_candidate
[ "01_N_202001_concentration_v4.0.tif", "02_N_202002_concentration_v4.0.tif", "03_N_202003_concentration_v4.0.tif", "04_N_202004_concentration_v4.0.tif", "05_N_202005_concentration_v4.0.tif", "06_N_202006_concentration_v4.0.tif", "07_N_202007_concentration_v4.0.tif", "08_N_202008_concentration_v4.0.tif"...
Question91/task.json
{"persistence_tif": {"type": "raster"}, "longest_run_areas_km2": {"type": "numeric_array", "absolute_tolerance": 0.5}, "at_least_six_month_fraction": {"type": "numeric", "absolute_tolerance": 1e-05}}
92
Question92
PC300-092
Monthly Sea-Ice Persistence and First-Occurrence Mapping
Given Northern Hemisphere monthly sea-ice products for months 1 through 12 of 2019 and ellipsoidal pixel areas in km². Decode raw values 0–1000 by dividing by 1000 to obtain concentration. Treat all other codes and file-masked pixels as invalid. 0 denotes valid ice-free water. Restrict analysis to pixels valid in all 1...
true
Change Analysis
construction_candidate
[ "01_N_201901_concentration_v4.0.tif", "02_N_201902_concentration_v4.0.tif", "03_N_201903_concentration_v4.0.tif", "04_N_201904_concentration_v4.0.tif", "05_N_201905_concentration_v4.0.tif", "06_N_201906_concentration_v4.0.tif", "07_N_201907_concentration_v4.0.tif", "08_N_201908_concentration_v4.0.tif"...
Question92/task.json
{"persistence_tif": {"type": "raster"}, "longest_run_areas_km2": {"type": "numeric_array", "absolute_tolerance": 0.5}, "at_least_six_month_fraction": {"type": "numeric", "absolute_tolerance": 1e-05}}
93
Question93
PC300-093
Joint Analysis of Two-Year Sea-Ice Seasonality and Spatial Differences
Compare the 24 monthly Southern Hemisphere sea-ice products for 2021 and 2022. Decode raw values 0–1000 by dividing by 1000 to obtain concentration. Exclude other codes and file-masked pixels; 0 is valid. Fix the domain to pixels valid in all 24 observations. Use concentration ≥15% to calculate each year's monthly sea-...
true
Change Analysis
construction_candidate
[ "01_S_202101_concentration_v4.0.tif", "02_S_202102_concentration_v4.0.tif", "03_S_202103_concentration_v4.0.tif", "04_S_202104_concentration_v4.0.tif", "05_S_202105_concentration_v4.0.tif", "06_S_202106_concentration_v4.0.tif", "07_S_202107_concentration_v4.0.tif", "08_S_202108_concentration_v4.0.tif"...
Question93/task.json
{"extent_first_year_km2": {"type": "numeric_array", "absolute_tolerance": 0.5}, "extent_second_year_km2": {"type": "numeric_array", "absolute_tolerance": 0.5}, "monthly_difference_km2": {"type": "numeric_array", "absolute_tolerance": 0.5}, "largest_decline_months": {"type": "set"}, "ice_month_change_tif": {"type": "ras...
94
Question94
PC300-094
Sea-Ice Extent Anomalies and Trends
Use the month-9 SIC raster for every year from 1999 through 2024. Decode raw values 0–1000 by dividing by 1000 to obtain concentration fractions; all other codes are invalid. Calculate annual extents using SIC≥15%, the supplied domain valid in all 26 years, and the supplied WGS84 pixel areas. Use the mean of the 10 mon...
true
Change Analysis
construction_candidate
[ "01_N_199909_concentration_v4.0.tif", "02_N_200009_concentration_v4.0.tif", "03_N_200109_concentration_v4.0.tif", "04_N_200209_concentration_v4.0.tif", "05_N_200309_concentration_v4.0.tif", "06_N_200409_concentration_v4.0.tif", "07_N_200509_concentration_v4.0.tif", "08_N_200609_concentration_v4.0.tif"...
Question94/task.json
{"years": {"type": "exact"}, "anomalies_km2": {"type": "numeric_array", "absolute_tolerance": 0.01}, "slope_km2_per_decade": {"type": "numeric", "absolute_tolerance": 0.01}, "sample_count": {"type": "exact"}, "maximum_anomaly_years": {"type": "set"}, "minimum_anomaly_years": {"type": "set"}}
95
Question95
PC300-095
Comparing Arctic and Antarctic Seasonal Evolution
For each pole, calculate extents derived from monthly mean SIC fields for 2024, using its own common valid domain for the entire year and a 15% threshold. For each pole, find maximum-extent months and (maximum−minimum)/annual_mean. Also calculate the shortest circular month distance between their maximum-extent months....
true
Change Analysis
construction_candidate
[ "01_N_202401_concentration_v4.0.tif", "02_N_202402_concentration_v4.0.tif", "03_N_202403_concentration_v4.0.tif", "04_N_202404_concentration_v4.0.tif", "05_N_202405_concentration_v4.0.tif", "06_N_202406_concentration_v4.0.tif", "07_N_202407_concentration_v4.0.tif", "08_N_202408_concentration_v4.0.tif"...
Question95/task.json
{"north_max_months": {"type": "set"}, "north_relative_amplitude": {"type": "numeric", "absolute_tolerance": 1e-06}, "south_max_months": {"type": "set"}, "south_relative_amplitude": {"type": "numeric", "absolute_tolerance": 1e-06}, "phase_distance_months": {"type": "exact"}}
96
Question96
PC300-096
Mean Concentration Versus Mean Extent
Using SIC for 30 days in month 9 of 2024, compare the following over the supplied common valid domain for the month: (1) calculate daily extent with SIC≥15%, then average these extents over the month; (2) first average daily SIC, then calculate extent using ≥15%. Decode raw values 0–1000 by dividing by 1000; all other ...
true
Change Analysis
construction_candidate
[ "01_N_20240901_concentration_v4.0.tif", "02_N_20240902_concentration_v4.0.tif", "03_N_20240903_concentration_v4.0.tif", "04_N_20240904_concentration_v4.0.tif", "05_N_20240905_concentration_v4.0.tif", "06_N_20240906_concentration_v4.0.tif", "07_N_20240907_concentration_v4.0.tif", "08_N_20240908_concent...
Question96/task.json
{"mean_daily_extent_km2": {"type": "numeric", "absolute_tolerance": 0.01}, "extent_of_mean_sic_km2": {"type": "numeric", "absolute_tolerance": 0.01}, "difference_km2": {"type": "numeric", "absolute_tolerance": 0.01}, "cell_contributions_tif": {"type": "raster_numeric", "absolute_tolerance": 0.001}, "explanation_choice"...
97
Question97
PC300-097
Comparing Sea-Ice Concentration and Ice-Edge Products
Within 75≤latitude≤85° and −90≤longitude≤0°, compare same-day ice presence defined by SIC≥15% against ice_edge categories 2 or 3. Construct an affine grid from the file's xc/yc pixel-center coordinates and resample edge to the original SIC grid using nearest neighbors. Do not assume the files are already aligned. Compa...
true
Quantitative Remote Sensing Analysis
construction_candidate
[ "01_ice_conc_nh_polstere-100_amsr2_202403151200.nc", "02_ice_edge_nh_polstere-100_multi_202403151200.nc", "03_cell_areas_km2.tif" ]
Question97/task.json
{"comparison_cells": {"type": "exact"}, "disagreement_cells": {"type": "exact"}, "disagreement_fraction": {"type": "numeric", "absolute_tolerance": 1e-06}}
98
Question98
PC300-098
Agreement Between Sea-Ice Concentration Products
Compare Northern Hemisphere SIC from NSIDC and OSI SAF AMSR2 for 2024-03-15. Decode NSIDC raw values 0–1000 by dividing by 1000. Divide decoded OSI percentages by 100. Use the original NSIDC 25 km grid as the target, construct the OSI affine grid from the file's xc/yc centers, and resample OSI concentration using GDAL ...
true
Quantitative Remote Sensing Analysis
construction_candidate
[ "01_N_20240315_concentration_v4.0.tif", "02_ice_conc_nh_polstere-100_amsr2_202403151200.nc", "03_N_cell_area_km2.tif" ]
Question98/task.json
{"common_cells": {"type": "exact"}, "bias_percentage_points": {"type": "numeric", "absolute_tolerance": 0.001}, "mae_percentage_points": {"type": "numeric", "absolute_tolerance": 0.001}}
99
Question99
PC300-099
Cross-Product Robustness of Long-Term Sea-Ice Trends
Using longterm_two_products.csv for month 9 in 1999–2018, compare the trend direction and minimum-anomaly year of the two products' sea-ice areas over the same fixed common valid sea region (70–85°N). The product order is Sea Ice Index v4.0, then CDR v06r00. Calculate OLS and Theil–Sen slopes (km²/decade), each product...
true
Change Analysis
construction_candidate
[ "01_longterm_two_products.csv", "02_trend_protocol.json", "03_trend_common_support.tif", "04_N_199909_concentration_v4.0.tif", "05_sic_psn25_199909_F13_v06r00.nc", "06_N_200009_concentration_v4.0.tif", "07_sic_psn25_200009_F13_v06r00.nc", "08_N_200109_concentration_v4.0.tif", "09_sic_psn25_200109_F1...
Question99/task.json
{"ols_theilsen_slopes": {"type": "numeric_array", "absolute_tolerance": 0.01}, "baseline_areas_km2": {"type": "numeric_array", "absolute_tolerance": 0.01}, "minimum_anomaly_years": {"type": "exact"}, "leave_one_out_ols_ranges": {"type": "numeric_array", "absolute_tolerance": 0.01}, "omit_transition_years_ols": {"type":...
100
Question100
PC300-100
Sea-Ice Extent Bounds Under Missing Coverage
Within the supplied sea domain where S26_ocean_support=1, calculate the observable lower bound and widest upper bound of sea-ice extent at the 15% threshold. Raw values 0–1000 are valid concentrations after division by 1000. 2510 and 2550 denote sea areas with unknown concentration. The lower bound includes only known ...
true
Quantitative Remote Sensing Analysis
construction_candidate
[ "01_N_202403_concentration_v4.0.tif", "02_north_cell_area_km2.tif", "03_S26_ocean_support.tif" ]
Question100/task.json
{"lower_extent_km2": {"type": "numeric", "absolute_tolerance": 0.1}, "upper_extent_km2": {"type": "numeric", "absolute_tolerance": 0.1}, "unknown_area_km2": {"type": "numeric", "absolute_tolerance": 0.1}}
End of preview. Expand in Data Studio

PolarTools

A benchmark for scientific analysis of polar Earth observations.

Tool repository · Question index · Dataset manifest · Task categories

PolarTools contains 717 numbered questions, including 710 active tasks and 7 retired historical tasks. Tasks cover polar remote sensing, scientific preprocessing, spatial measurement, temporal change, and geospatial mapping, using SAR and optical imagery, UAV observations, masks, vector data, NetCDF products, and professional references.

Dataset overview

Property Contents
Questions Question1/ through Question717/
Active tasks 710
Retired tasks Question390, Question400, Question405, Question411, Question417, Question423, Question429
Language English
Inputs SAR and optical observations, UAV orthomosaics, masks, vector regions, NetCDF products, sensor metadata, scientific processing packages, and reference documents
Outputs Values, structured JSON, masks, geospatial rasters, GeoJSON, charts, and maps

Task categories

Primary category Active tasks Capabilities
Recognition, localization, and knowledge interpretation 32 Target localization and evidence retrieval
Measurement and counting 125 Target counting, spatial measurement, and observation statistics
Segmentation and spatial structure analysis 145 Target delineation, mask topology, and spatial structure
Change analysis 256 Temporal differences, spatial trajectories, and observation changes
Quantitative remote sensing analysis 29 Product analysis, sensor units, and quantitative diagnostics
Preprocessing and cartography 123 Input preparation, grid alignment, sensor processing, and georeferenced mapping
Total 710

Segmentation and spatial structure analysis comprises 61 raw-image segmentation tasks and 84 supplied-mask structure and statistics tasks. Recognition, localization, and knowledge interpretation includes 10 evidence-retrieval tasks.

Dataset composition

Folder range Task family
Question1–Question600 Original polar task pool
Question601–Question610 Evidence retrieval from professional references
Question611–Question613 Cartography
Question614–Question643 Additional cartography
Question644–Question673 Remote-sensing preprocessing
Question674–Question693 Raw-image iceberg segmentation
Question694–Question717 Multi-observation iceberg identity, tracking, and cartography

Data structure

PolarTools/
├── README.md
├── tasks.jsonl
├── task_index.md
├── taxonomy.json
├── manifest.json
├── Question1/
│   ├── task.json
│   ├── README.md
│   ├── 01_...tif
│   └── 02_...geojson
├── Question2/
│   └── ...
└── Question717/
    ├── task.json
    ├── README.md
    ├── input_manifest.json
    └── Question76/

Download

Complete dataset

python -m pip install huggingface_hub
hf download PolarTools/PolarTools \
  --repo-type dataset \
  --local-dir ./PolarTools-Benchmark

Individual question

from huggingface_hub import snapshot_download

root = snapshot_download(
    repo_id="PolarTools/PolarTools",
    repo_type="dataset",
    local_dir="./PolarTools-Benchmark",
    allow_patterns=[
        "README.md", "tasks.jsonl", "manifest.json", "taxonomy.json",
        "Question1/**",
    ],
)

Task metadata

from datasets import load_dataset

archive = load_dataset("PolarTools/PolarTools", "metadata", split="archive")
active = archive.filter(lambda row: row["active"])
print(len(archive), len(active))

Use a question

import json
from pathlib import Path

question_dir = Path("PolarTools-Benchmark/Question1")
task = json.loads((question_dir / "task.json").read_text())
input_files = [question_dir / name for name in task["input_files"]]

assert all(path.is_file() for path in input_files)
print(task["id"], task["title"])
print(task["question"])

Evaluation settings

  • General Solving (GS): general reasoning with optional self-written code.
  • Tool-Augmented (TA): general reasoning with specialist tools.
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