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Diagnostic use only: never a headline or ranking value.", "quality_summary": { "review": [], "extent": [ "may_continue_beyond_end" ] }, "provenance": { "analysis_version": "0.1.0", "sample_interval_m": 1.0, "interpolation": "bilinear", "smoothing": "none", "gradient_windows_m": [ 5.0, 10.0, 20.0, 25.0, 50.0, 100.0 ], "diagnostic_windows_m": [ 2.0, 3.0 ], "elevation_crs": "EPSG:26918", "elevation_resolution_m": 1.0, "elevation_tiles": [ "data/cache/usa/ma/USGS_1M_18_x64y472_MA_Western_B24.tif", "data/cache/usa/ma/USGS_1M_18_x64y473_MA_Western_B24.tif", "data/cache/usa/ma/USGS_1M_18_x65y473_MA_Western_B24.tif" ], "calculated_at": "2026-08-22T14:30:37+00:00", "road_source": "OpenStreetMap (local PBF extract)", "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL", "osm_ids": [ 9070236, 514597992, 514597996, 9547957, 8873623, 225543572, 8873458 ], "osm_versions": { "9070236": 13, "514597992": 6, "514597996": 7, "9547957": 12, "8873623": 11, "225543572": 10, "8873458": 7 }, "osm_timestamps": { "9070236": "2023-08-08 16:05:52+00:00", "514597992": "2023-08-07 22:10:56+00:00", "514597996": "2023-08-07 22:10:56+00:00", "9547957": "2023-08-07 22:10:56+00:00", "8873623": "2023-08-07 22:10:56+00:00", "225543572": "2025-02-11 02:35:22+00:00", "8873458": "2023-08-11 20:58:20+00:00" }, "osm_retrieved_at": "2026-08-22T14:30:37+00:00", "osm_pbf_path": "data/cache/pbf/massachusetts-260822.osm.pbf", "osm_snapshot": "2026-08-21T20:21:11Z", "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": [ "x64y472", "x64y473", "x65y473" ], "climb_origin": "named", "notes": "Rockwell Road from Lanesborough + Summit Road. Asphalt (OSM).", "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": "Massachusetts", "county": "" } }