vector-buffer · Task vector-buffer-1km · record derived from run 4a0b7258

Vector buffer: 1000 m buffers around points in WGS84

Headline outcome

In shortThis task has been attempted in 4 runs since 12 Jul 2026. Best fully accepted result: 100% in run 90a4a241. The most recent run scored 75%.

Quality score · across 4 runs since 12 Jul 202675%3 of 4 trials accepted in run 4a0b7258 (12 Jul 2026, 18:09 UTC). Earlier and later runs, including rejected and inconclusive ones, are listed below.

Every run containing this task, newest first. Blocked and inconclusive outcomes stay visible.
Run	Date	Status	Accepted / total	Cost USD
23cad676	12 Jul 2026, 18:16 UTC	accepted	4/5	0.0112
90a4a241	12 Jul 2026, 18:10 UTC	accepted	4/4	0.0044
df7df63d	12 Jul 2026, 18:10 UTC	accepted	4/4	0.0054
4a0b7258	12 Jul 2026, 18:09 UTC	accepted	3/4	0.0060

Trial detail from the most recent run

limit: Creating buffers.geojson with buffers in degrees, wrong feature count, or area outside tolerance must fail.

GLM-4.7 Flash — accepted · 1 attempt(s) · 0.0012 USD · 22919 ms · failure: None

Attempt trace undefined

# attempt undefined — exit 0 — accepted — cost 0.0012 USD — 22919 ms
# verifier: PASS — 1000m buffers verified
# artifact: download (5935 bytes)
import geopandas as gpd

def main():
    # Read the input file
    gdf = gpd.read_file("sites.geojson")

    # Define source and target coordinate reference systems
    src_crs = "EPSG:4326"
    tgt_crs = "EPSG:3857"

    # Reproject to a projected CRS (e.g., Web Mercator) to ensure accurate 1000m buffering
    gdf_projected = gdf.to_crs(tgt_crs)

    # Create 1000m buffers
    gdf_projected['geometry'] = gdf_projected.buffer(1000)

    # Reproject back to WGS84 (EPSG:4326) for the output
    gdf_final = gdf_projected.to_crs(src_crs)

    # Write the result to the output file
    gdf_final.to_file("buffers.geojson", driver="GeoJSON")

if __name__ == "__main__":
    main()

GLM-4.7 Flash — accepted · 1 attempt(s) · 0.0013 USD · 25572 ms · failure: None

Attempt trace undefined

# attempt undefined — exit 0 — accepted — cost 0.0013 USD — 25572 ms
# verifier: PASS — 1000m buffers verified
# artifact: download (5903 bytes)
import geopandas as gpd

# Read the input file
gdf = gpd.read_file("sites.geojson")

# Reproject to a projected CRS (EPSG:3857) to ensure accurate 1000m buffering
gdf_projected = gdf.to_crs(epsg=3857)

# Create 1000m buffers
gdf_buffered = gdf_projected.buffer(1000)

# Reproject back to WGS84 (EPSG:4326) for the final output
gdf_final = gdf_buffered.to_crs(epsg=4326)

# Write the output file
gdf_final.to_file("buffers.geojson", driver="GeoJSON")

Kimi K2.6 — accepted · 1 attempt(s) · 0.0012 USD · 32603 ms · failure: None

Attempt trace undefined

# attempt undefined — exit 0 — accepted — cost 0.0012 USD — 32603 ms
# verifier: PASS — 1000m buffers verified
# artifact: download (5935 bytes)
import geopandas as gpd

gdf = gpd.read_file("sites.geojson")
if gdf.crs is None:
    gdf.set_crs("EPSG:4326", inplace=True)
gdf_proj = gdf.to_crs("EPSG:3857")
gdf_proj["geometry"] = gdf_proj.buffer(1000)
gdf_wgs84 = gdf_proj.to_crs("EPSG:4326")
gdf_wgs84.to_file("buffers.geojson", driver="GeoJSON")

Kimi K2.6 — accepted · 2 attempt(s) · 0.0035 USD · 97444 ms · failure: None

Attempt trace undefined

# attempt undefined — exit 0 — rejected — cost 0.0019 USD — 53633 ms
# verifier: FAIL — verifier did not emit JSON; stdout tail: 
# no artifact produced

Attempt trace undefined

# attempt undefined — exit 0 — accepted — cost 0.0016 USD — 97444 ms
# verifier: PASS — 1000m buffers verified
# artifact: download (5935 bytes)
import geopandas as gpd

sites = gpd.read_file("sites.geojson")

if sites.crs is None:
    sites = sites.set_crs("EPSG:4326")
else:
    sites = sites.to_crs("EPSG:4326")

sites_proj = sites.to_crs("EPSG:3857")
sites_proj["geometry"] = sites_proj.buffer(1000)
buffers = sites_proj.to_crs("EPSG:4326")

buffers.to_file("buffers.geojson", driver="GeoJSON")

Kimi K2.6 — rejected · 2 attempt(s) · 0.0039 USD · 97840 ms · failure: Verifier rejection

Attempt trace undefined

# attempt undefined — exit 0 — rejected — cost 0.0019 USD — 50258 ms
# verifier: FAIL — verifier did not emit JSON; stdout tail: 
# no artifact produced

Attempt trace undefined

# attempt undefined — exit 0 — rejected — cost 0.0020 USD — 97840 ms
# verifier: FAIL — verifier did not emit JSON; stdout tail: 
# no artifact produced

Deterministic checks

Limit: Creating buffers.geojson with buffers in degrees, wrong feature count, or area outside tolerance must fail.
Verifier: buffer-area — deterministic verification first, LLM judge as side metric only

Cite this record

Axis Spatial. "Evidence record: Vector buffer: 1000 m buffers around points in WGS84." Axis Spatial Arena, evidence vector-buffer-1km. https://www.axisspatial.com/arena/evidence/vector-buffer-1km (accessed 19 Sep 2026).

@misc{axis-spatial-arena-evidence-vector-b,
  author = {{Axis Spatial}},
  title = {Evidence record: Vector buffer: 1000 m buffers around points in WGS84},
  howpublished = {Axis Spatial Arena, evidence: https://www.axisspatial.com/arena/evidence/vector-buffer-1km},
  year = {2026}
}

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