prometheus-doi-lands-data

DOI-Lands boundary mask feed for PROMETHEUS (situational awareness for DOI Emergency Management / EHSD). Keyless federal sources → slim GeoJSON + JSON on the GitHub CDN, weekly cron.

Phase 1 covers NPS only. BLM / FWS / BIA / BOR / BOEM added in later phases.

Files

• data/lands-nps.geojson — 422 NPS unit polygons, Douglas-Peucker simplified (0.001° ≈ 111m). Properties: bureau, unit_code, unit_name, unit_type, region, state, acres (authoritative unsimplified), acres_simplified (derived).
• data/lands-index.json — fast-filter index: national totals + per-unit {unit_code, unit_name, bbox, centroid, acres, unit_type, region, state}. No geometry — for panels that only need the roll-up + a click-to-drilldown.
• data/lands-nps-benchmark.json — acreage-error benchmark under tolerance sweep (transparency: operators can see what precision they're getting).

Consumers

• prometheus-hazard-lands-data — intersects hazard polygons (fire/weather/quake) against this mask and publishes the DOI-Lands-scoped hazard feeds.
• prometheus-sa (the app) — reads only the intersected hazard feeds; never touches this raw mask directly (would be a 20MB payload).

Source

• NPS Land Resources Division ArcGIS FeatureServer: services1.arcgis.com/fBc8EJBxQRMcHlei/.../National_Park_Service_Boundaries/FeatureServer/0
• Keyless, f=geojson, paginated at 2000/request.
• Attribution: National Park Service — Land Resources Division.

Numbers (2026-07-08 first run)

• 422 features (matches published NPS unit count).
• 85,191,005 total acres (matches published NPS ~85M figure).
• 0.013% national roll-up error at the locked simplification tolerance.
• 20 MB raw / ~4 MB gzipped over the CDN. Refresh weekly.