Research/Terra/ 291123
Task evidence / contour-map

Create contour lines from Angola's population data in relation to power stations

PassComputational taskUnpublished draft
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The question

291123
Create contour lines from Angola's population data in relation to power stations
Exact submitted task and declared adaptations
Create contour lines from Angola's population data in relation to power stations

Task conventions: Use band 1 of the frozen angola_population raster at the original grid without resampling, smoothing or clipping. Draw the explicit contour levels [50, 100, 200, 400, 600] in people per cell. These levels are a disclosed evaluation convention, not a requested interval. Use piecewise-linear marching-squares isolines through pixel-center values, low-valued connectivity at ambiguous saddles. Respect the native mask, NoData and nonfinite cells; do not bridge holes or extrapolate at the outside edge. Apply any source scale and offset. NoData means unknown, never zero. Preserve source coverage; levels outside the observed range may have no line. Do not substitute a current raster. Count nonempty requested contour LEVELS, not polyline fragments. The population-count raster, where supplied, is people per original cell; do not label it population density. Overlay the supplied power_stations original geometries on the same map. Retain exactly the point rows matching {"Country": ["Angola"]}. This is a visual spatial comparison; no invented causal correlation or extra buffer is requested. 



Deliver an inspectable vector contour artifact and add it to the map with a level/units legend. End with one fenced JSON object containing: count (number of nonempty requested levels), unknown_count (number of masked or nonfinite source pixels), coverage_note, selection: {collectionId,itemId,assetKey}, level_field, feature_count (actual contour feature rows), map_layer_id. Also include overlay: {selection: {collectionId,itemId,assetKey}, map_layer_id, count}, retaining original benchmark_row_id. Explain the source season/year, units, missing coverage, and visual relationship where an overlay is requested.

Delivery format: provide the answer object with all fields specified above as final_response on assess_result, alongside the inspected final artifact_refs. This replaces the JSON-code-block formatting requirement above. Blue attaches your explicit selection to the accepted final answer. Finish with a concise ordinary-language answer agreeing with that selected result; do not duplicate the JSON in chat.

Supplied immutable inputs:
[
  {
    "name": "Angola population count, WorldPop 2020",
    "edition": "2020 UN-adjusted population aggregated to 1 km cells",
    "units": {
      "band1": "people per cell"
    },
    "collectionId": "blue-generated--[resource id withheld]",
    "itemId": "[resource id withheld]",
    "assetKey": "data"
  },
  {
    "name": "African power stations",
    "edition": "USGS 2021 frozen compilation",
    "units": {
      "DsgAttr02": "MW"
    },
    "collectionId": "blue-generated--[resource id withheld]",
    "itemId": "[resource id withheld]",
    "assetKey": "data"
  }
]

Outcome & verification

Independent artifact and delivery checks passed.

Duration
15m 51s
Recorded Blue tool calls
51
Total tokens
2,195,914
Model cost
Not recorded
Application revision
d50497ea9084f29c91b05406688f87035df98d8a
Release
terra-geobenchx-v1

Recorded final answer

Done — the contour layer and Angola power-station overlay are on the map. Population uses the supplied WorldPop 2020 annual UN-adjusted raster in people per cell, not density. All five requested contour levels are present. Missing coverage remains where 947,409 source cells are masked, so contours stop at those gaps and at the raster edge. Power uses the supplied USGS 2021 frozen compilation. I retained 80 Angola rows with benchmark_row_id; 78 draw as points because 2 source rows have no geometry. Visually, several stations sit near higher-population contour clusters, especially in western and central Angola, while other contour clusters are away from mapped stations. This is a visual comparison only. ### Limitations - This is a visual spatial comparison only. It does not establish causation or use buffers. - The population raster is people per cell, not population density. - Masked or nonfinite raster cells remain unknown and produce contour gaps. - The power overlay uses the supplied USGS 2021 frozen compilation; 2 retained Angola rows have no source geometry, so only 78 points can draw on the map. - The population source is WorldPop 2020 annual UN-adjusted population aggregated to 1 km cells, in people per cell, not population density. - Band 1 has 947,409 masked or otherwise unknown source cells; contours stop at those gaps and at the outer edge. - This is a visual spatial comparison only; it does not imply causation or use buffers. - The overlay uses the supplied USGS 2021 frozen compilation, not a current inventory. - Two retained Angola rows in the supplied power-station source have null geometry, so 78 points draw on the map although 80 Angola rows are retained in the overlay artifact.

Independent checks

These checks are separate from the agent's own assessment. A successful job or an assertion of success is not enough to pass.

Expected count
5
Reported count
5
Computation verified
Yes
Answer fulfilled
Yes
Full grading and rubric record
{
  "expectedCount": 5,
  "actualCount": 5,
  "expectedMetrics": null,
  "actualMetrics": null,
  "computationCorrect": true,
  "answerFulfilled": true,
  "adjudication": null,
  "qualification": null,
  "reasons": []
}

Recorded investigation findings

The agent's reported hypotheses and assessments, retained as evidence of its process—not independent proof that the answer is correct. Failed calls retain their requested verdict, not an accepted assessment.

run_trial · completed

Do the supplied frozen Angola population-count raster and supplied African power-station compilation support the exact requested contour map and Angola overlay without resampling, smoothing, clipping, gap-bridging or source substitution?

assess_trial · completed · assessment: sufficient

The supplied frozen Angola population raster supports the requested exact contour method on band 1 without resampling, smoothing, clipping or source substitution. Full-raster statistics show scale 1.0, offset 0.0, minimum 0.010543260723352432, maximum 62506.2265625, and missing_count 947409, so all five requested contour levels fall within the observed valid range while masked cells remain unknown. The contour output contains 2939 line features and only the requested levels 50, 100, 200, 400 and 600 people per cell; dissolving by level returns 5 rows, so all 5 requested levels are nonempty. The Angola power-station filter keeps 80 rows with Country fixed to Angola and benchmark_row_id present for all rows; 78 rows have point geometry and 2 retained rows have null coordinates/geometry in the source. The previews show a suitable country-scale visual comparison between the contour network and the retained Angola power-station points.

assess_result · failed · requested assessment: sufficient

I delivered the requested visual comparison using the supplied frozen sources. The final contour artifact comes from the supplied WorldPop 2020 Angola population-count raster, band 1, and the supporting statistics table shows scale 1.0, offset 0.0, minimum 0.010543260723352432, maximum 62506.2265625, and missing_count 947409 on the full raster. The final contour artifact contains 2939 contour features with a level field in people per cell, and the dissolved level-count artifact shows all five requested levels are nonempty: 50, 100, 200, 400 and 600. The contour layer is on the map as layer [resource id withheld]. The final overlay artifact comes from the supplied USGS 2021 frozen African power-station compilation, filtered to Country=Angola, with 80 retained rows and benchmark_row_id preserved. The overlay preview shows 78 point geometries draw on the map because 2 retained Angola rows have null source geometry; the overlay layer is on the same map as layer [resource id withheld]. Visually, several power stations sit near higher population contour clusters, especially in western and central Angola, while other contour clusters are away from mapped stations. This remains a visual comparison only and does not establish causation.

assess_result · completed · assessment: sufficient

Using the supplied WorldPop 2020 Angola population-count raster, I delivered a final contour artifact with 2939 line features and a level field in people per cell. The supporting full-raster statistics table shows band 1, scale 1.0, offset 0.0, minimum 0.010543260723352432, maximum 62506.2265625, and missing_count 947409 on the supplied raster. The dissolved level-count artifact lists all five requested nonempty levels: 50, 100, 200, 400 and 600. The contour layer is bound to the current map as layer [resource id withheld]. For the requested visual comparison, I also bound the supplied USGS 2021 frozen Angola power-station overlay on the same map as layer [resource id withheld].

assess_result · completed · assessment: sufficient

Using the supplied USGS 2021 frozen African power-station compilation, I delivered an Angola overlay artifact with 80 retained rows, all with Country=Angola, and benchmark_row_id preserved for all 80 rows. The current overlay preview shows 78 valid point geometries on the map because 2 retained Angola rows have null source geometry. The overlay layer is bound to the current map as layer [resource id withheld], alongside the final contour layer [resource id withheld].

Recorded workflow

  1. 01

    Angola power stations

    Recorded vector-filter · succeeded

  2. 02

    Contour levels present

    Recorded vector-dissolve · succeeded

  3. 03

    Population contours

    Recorded raster-contours · succeeded

  4. 04

    Angola population contours

    Recorded output · succeeded

  5. 05

    Angola power stations

    Recorded output · succeeded

  6. 06

    Angola population raster statistics

    Recorded output · succeeded

  7. 07

    Requested contour levels present

    Recorded output · succeeded

  8. 08

    Population raster statistics

    Recorded raster-statistics · succeeded

  9. 09

    Supplied Angola population count raster

    Recorded source · succeeded

  10. 10

    Supplied African power stations

    Recorded source · succeeded

  11. 11

    Angola power stations

    Recorded vector-filter · succeeded

  12. 12

    Contour levels present

    Recorded vector-dissolve · succeeded

  13. 13

    Population contours

    Recorded raster-contours · succeeded

  14. 14

    Population raster statistics

    Recorded raster-statistics · succeeded

  15. 15

    Supplied Angola population count raster

    Recorded source · succeeded

  16. 16

    Supplied African power stations

    Recorded source · succeeded

  17. 17

    Population raster statistics

    Recorded output · succeeded

  18. 18

    Population contours

    Recorded output · succeeded

  19. 19

    Contour levels present

    Recorded output · succeeded

  20. 20

    Angola power stations

    Recorded output · succeeded

Activity

Recorded actions

Recorded observable actions only, not private reasoning. Raw payloads, geometry, private links and credentials are omitted; full evidence is retained privately. Activity/workflow lists bounded at 500 entries.

  1. Progress update

    I’ll set up a small analysis brief, inspect the supplied raster/vector inputs, and test the exact contour method on the frozen Angola population grid before I save the production workflow.

  2. get_analysis

    Recorded tool call · completed

  3. get_collection

    Recorded tool call · completed

  4. get_collection

    Recorded tool call · completed

  5. get_tool_help

    Recorded tool call · completed

  6. get_item

    Recorded tool call · completed

  7. list_processors

    Recorded tool call · completed

  8. get_item

    Recorded tool call · completed

  9. get_tool_help

    Recorded tool call · completed

  10. Progress update

    I inspected the frozen inputs. The population source is the supplied WorldPop 2020 Angola count raster with band 1 in people per cell and declared NoData -99999. The overlay source is the supplied USGS 2021 African power-station compilation with a Country field and benchmark_row_id. Next I’m testing the exact contour processor and the Angola point filter before saving the full run.

  11. update_analysis_brief

    Recorded tool call · completed

  12. describe_processors

    Recorded tool call · completed

  13. describe_processors

    Recorded tool call · completed

  14. get_collection

    Recorded tool call · completed

  15. describe_processors

    Recorded tool call · completed

  16. describe_processors

    Recorded tool call · completed

  17. get_tool_help

    Recorded tool call · completed

  18. list_processors

    Recorded tool call · completed

  19. Progress update

    I’ve confirmed the exact processors I need: raster-contours matches the requested marching-squares method and vector-filter can keep only Country=Angola. I’m adding one more small check so I can count nonempty contour levels cleanly and then I’ll run a full-scope private trial on the supplied frozen inputs.

  20. get_tool_help

    Recorded tool call · completed

  21. get_tool_help

    Recorded tool call · completed

  22. get_tool_help

    Recorded tool call · completed

  23. get_tool_help

    Recorded tool call · completed

  24. get_tool_help

    Recorded tool call · completed

  25. get_tool_help

    Recorded tool call · completed

  26. get_tool_help

    Recorded tool call · completed

  27. get_tool_help

    Recorded tool call · completed

  28. get_tool_help

    Recorded tool call · completed

  29. get_tool_help

    Recorded tool call · completed

  30. get_tool_help

    Recorded tool call · completed

  31. run_trial

    Recorded tool call · completed

  32. Progress update

    The private test finished successfully. I’ve confirmed the raster range, all five requested contour levels, and the Angola point filter. I’m checking the trial’s spatial previews now so I can save the exact tested method as the final workflow instead of rebuilding it.

  33. get_trial_report

    Recorded tool call · completed

  34. assess_trial

    Recorded tool call · completed

  35. describe_processors

    Recorded tool call · completed

  36. get_analysis

    Recorded tool call · completed

  37. describe_processors

    Recorded tool call · completed

  38. Progress update

    I’ve verified the tested method. One practical limitation remains: the Angola station selection keeps 80 source rows, but 2 of those rows have no source geometry, so only 78 points can actually draw on the map. I’m now saving a production workflow and checking whether the contour display should use the raw lines or a classified copy to guarantee a readable level legend.

  39. update_analysis_brief

    Recorded tool call · completed

  40. propose_workflow

    Recorded tool call · completed

  41. execute_workflow

    Recorded tool call · completed

  42. Progress update

    I’ve saved the exact tested workflow. It keeps the requested frozen sources, the five contour levels, and the Angola-only point filter, plus supporting outputs for the unknown-cell count and nonempty level count. Next I’m running that saved workflow, then I’ll inspect the outputs and bind the verified layers to the map.

  43. inspect_workflow_results

    Recorded tool call · completed

  44. Progress update

    The saved run finished in the background. I’m inspecting the exact output artifacts now so I can bind the verified contour and overlay layers, then I’ll record the final answer object with the selected artifact IDs and layer IDs.

  45. Progress update

    I’ve confirmed the saved outputs and their map bindings. I’m doing two last checks now: the contour and overlay previews, and whether the current map layer metadata shows the level field cleanly enough to support the requested legend.

  46. inspect_artifact

    Recorded tool call · completed

  47. inspect_artifact

    Recorded tool call · completed

  48. inspect_artifact

    Recorded tool call · completed

  49. inspect_artifact

    Recorded tool call · completed

  50. list_map_layers

    Recorded tool call · completed

  51. Progress update

    I already have the finished artifact IDs and layer IDs from the workflow receipts. I’m retrieving the bounded inspection details now so the final assessment can use current values from the delivered contour, overlay, statistics, and level-count artifacts.

  52. inspect_artifact

    Recorded tool call · completed

  53. inspect_artifact

    Recorded tool call · completed

  54. inspect_artifact

    Recorded tool call · completed

  55. inspect_artifact

    Recorded tool call · completed

  56. list_map_layers

    Recorded tool call · completed

  57. Progress update

    I have the current inspection receipts for the contour artifact, the Angola overlay, the raster statistics table, and the nonempty-level count. I’m checking the live map layer metadata one time now so I can confirm the contour layer binding and whether the map is carrying the level/units legend information with the added layer.

  58. Progress update

    The outputs are fully inspected now. I have the final contour artifact, the supporting count/unknown statistics, and the map-bound overlay layer IDs. I’m recording the final result object next so Blue can attach the selected artifacts and answer fields to the accepted result.

  59. assess_result

    Recorded tool call · failed

  60. Progress update

    I found one wording mismatch in my own saved brief: the overlay source is a point compilation, but two Angola records in that frozen source have null geometry. I’m correcting the acceptance wording to match the original request more faithfully — exact Angola-row retention plus original geometry preservation where present — before I record the two final result assessments.

  61. update_analysis_brief

    Recorded tool call · completed

  62. assess_result

    Recorded tool call · completed

  63. assess_result

    Recorded tool call · completed

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