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  "calculated_at": "2026-08-24T20:49:04+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/maine-2026-08-22.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "redo-me-1-260824",
  "elevation_provider": "USGS 3DEP (The National Map)",
  "elevation_licence": "Public domain \u2014 USGS 3DEP 1 m DEM, courtesy of the U.S. Geological Survey",
  "elevation_dataset": "USGS 3DEP 1 m DEM, NH_Umbagog_LiDAR_2016_D16 (collected 2016)",
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  "notes": "Coarse pass: max 14.0% over 200 m (Terrain 50), gain 281.6 m over 3202 m way. KEPT at seed extent: no ascending continuation (min_avg=2.0%). ADOPTED (NE wave 2, 2026-08-25): big-gain. Wales dials; max25-contaminated class resolved by the box session \u2014 doc era: original (dips xsectioned as real surface dips). Evidence in ne-adoption-audits (triage, xsection, mask manifest).",
  "canopy_check": "unavailable \u2014 no surface model (DSM or point cloud) registered for this coverage",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "North Oxford",
  "county": "Maine"
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}