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Diagnostic use only: never a headline or ranking value.", "quality_summary": { "structure_suppression": { "masked_fraction": 0.015, "windows_resited": [ 2.0, 3.0, 5.0, 10.0, 50.0, 100.0 ], "windows_unresolved": [] }, "excluded_ranges_m": [ [ 4203.0, 4222.0 ], [ 4321.0, 4338.0 ], [ 4562.0, 4581.0 ], [ 4701.0, 4722.0 ], [ 5072.0, 5091.0 ], [ 5285.0, 5304.0 ], [ 7763.0, 7768.0 ] ], "review": [], "review_confirmed": { "flags": [ "short_window_divergence" ], "by": "Peter, 2026-08-22 \u2014 station-data review" }, "extent": [] }, "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:26919", "elevation_resolution_m": 1.0, "elevation_tiles": [ "data/cache/usa/nh/USGS_one_meter_x30y492_NH_CT_RiverNorthL6_2015.tif", "data/cache/usa/nh/USGS_one_meter_x31y491_NH_CT_RiverNorthL6_2015.tif", "data/cache/usa/nh/USGS_one_meter_x31y492_NH_CT_RiverNorthL6_2015.tif" ], "calculated_at": "2026-08-22T17:12:17+00:00", "road_source": "OpenStreetMap (local PBF extract)", "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL", "osm_ids": [ 1237911045, 761027510, 846995948, 1004198262, 1004198263, 1004198260, 1004198261, 1004198252, 1004198255, 1004198254, 1004198253, 1004198256, 1004198259, 1004198258, 1004198257, 18846225 ], "osm_versions": { "1237911045": 1, "761027510": 6, "846995948": 5, "1004198262": 2, "1004198263": 1, "1004198260": 2, "1004198261": 1, "1004198252": 2, "1004198255": 2, "1004198254": 2, "1004198253": 1, "1004198256": 2, "1004198259": 2, "1004198258": 2, "1004198257": 1, "18846225": 21 }, "osm_timestamps": { "1237911045": "2024-01-07 22:51:32+00:00", "761027510": "2025-12-15 13:15:38+00:00", "846995948": "2022-11-26 18:26:43+00:00", "1004198262": "2022-11-26 18:26:43+00:00", "1004198263": "2021-11-19 03:39:37+00:00", "1004198260": "2022-11-26 18:26:43+00:00", "1004198261": "2021-11-19 03:39:37+00:00", "1004198252": "2022-11-26 18:26:43+00:00", "1004198255": "2022-11-26 18:26:43+00:00", "1004198254": "2022-11-26 18:26:43+00:00", "1004198253": "2021-11-19 03:39:37+00:00", "1004198256": "2022-11-26 18:26:43+00:00", "1004198259": "2022-11-26 18:26:43+00:00", "1004198258": "2022-11-26 18:26:43+00:00", "1004198257": "2021-11-19 03:39:37+00:00", "18846225": "2026-06-26 14:25:55+00:00" }, "osm_retrieved_at": "2026-08-22T17:12:16+00:00", "osm_pbf_path": "data/cache/pbf/new-hampshire-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, NH_CT_RiverNorthL6_2015 (collected 2015)", "elevation_tile_ids": [ "x30y492", "x31y491", "x31y492" ], "route_summit_trim_m": 3549.5, "route_summit_trim_loss_m": 233.0, "climb_origin": "named", "notes": "Gravel; Jefferson/Valley Road side to the notch, full side. Way 18846225 (shared with the south entry - it crosses the notch and carries the notch-side 2.9 km of the north approach) appended 2026-08-22; summit_trim cuts its south-side descent. Served by NH_CT_RiverNorthL6_2015. review_confirmed (Peter 2026-08-22): the 5-vs-10 m divergence at 941-951 m is a coherent monotone +3.6 m ramp over 17 m (7 stations at 24-44%), a real short gravel pitch \u2014 no artifact signature.", "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": "New Hampshire", "county": "" } }