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 "diagnostic_note": "Windows <=3 m are at raster-noise scale (1-sigma raster noise alone is roughly +/-7 pp at 2 m and +/-5 pp at 3 m on a 1 m DTM). Diagnostic use only: never a headline or ranking value.",
 "quality_summary": {
  "review": [
   "max10_over_40"
  ],
  "extent": [
   "may_start_earlier",
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 },
 "provenance": {
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  "interpolation": "bilinear",
  "smoothing": "none",
  "gradient_windows_m": [
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  "elevation_crs": "EPSG:26918",
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  "elevation_tiles": [
   "data/cache/usa/ma/USGS_1M_18_x68y472_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-08-24T21:27:37+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/massachusetts-260822.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "redo-ma-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, MA_Western_B24 (collected 2023-24)",
  "elevation_tile_ids": [
   "x68y472"
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  "climb_origin": "discovered",
  "notes": "Coarse pass: max 25.5% over 200 m (Terrain 50), gain 23.5 m over 92 m way. KEPT at seed extent: no ascending continuation (min_avg=2.0%). ADOPTED (NE wave 1, 2026-08-25): clean-steep. Wales dials per PRODUCTION 'US ADOPTION DIALS'.",
  "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": "Buckland",
  "county": "Massachusetts"
 }
}