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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": {
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  "extent": [
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 },
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  "calculated_at": "2026-09-04T21:42:15+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": "hunt-wave1-260905",
  "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)",
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  "climb_origin": "discovered",
  "canopy_check": "unavailable \u2014 EPT corridor failed: USGS_LPC_MA_ME_MA_QL1_UTM18_L1_2015_LAS_2018: no corridor points fetched; USGS_LPC_MA_ME_MA_QL2_UTM18_L1_2015_LAS_2018: no corridor points fetched; USGS_LPC_MA_NE_CMGP_Sandy_Z18_2013: no corridor points fetched",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Holyoke",
  "county": "Massachusetts"
 }
}