{
 "ocl_version": "0.1.0",
 "name": "George Street",
 "slug": "george-street",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 21.72085558324426,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 97.0,
   "end_distance_m": 99.0,
   "start_elevation_m": 159.76074852261672,
   "end_elevation_m": 160.1951656342816,
   "min_gradient_pct": 0.04063998733130347
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 21.57361179873476,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 96.0,
   "end_distance_m": 99.0,
   "start_elevation_m": 159.54795728031957,
   "end_elevation_m": 160.1951656342816,
   "min_gradient_pct": 0.42666985946008634
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 21.38349776772486,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 94.0,
   "end_distance_m": 99.0,
   "start_elevation_m": 159.12599074589536,
   "end_elevation_m": 160.1951656342816,
   "min_gradient_pct": 0.9576864107538086
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.113081347235436,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 89.0,
   "end_distance_m": 99.0,
   "start_elevation_m": 158.08385749955806,
   "end_elevation_m": 160.1951656342816,
   "min_gradient_pct": 1.5561578028379586
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.880071346656166,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 79.0,
   "end_distance_m": 99.0,
   "start_elevation_m": 156.01915136495037,
   "end_elevation_m": 160.1951656342816,
   "min_gradient_pct": 4.8266697747760645
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.794741352030087,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 74.0,
   "end_distance_m": 99.0,
   "start_elevation_m": 154.9964802962741,
   "end_elevation_m": 160.1951656342816,
   "min_gradient_pct": 6.433099102578581
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.634245407694152,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 69.0,
   "end_distance_m": 119.0,
   "start_elevation_m": 153.96773398302372,
   "end_elevation_m": 164.2848566868708,
   "min_gradient_pct": 11.723997295575145
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.04166942184682,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 38.0,
   "end_distance_m": 138.0,
   "start_elevation_m": 147.9016792913669,
   "end_elevation_m": 167.9433487132137,
   "min_gradient_pct": 16.064545988590822
  }
 ],
 "shape": {
  "ascent_concentration": 0.332,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 149.0,
  "shape_class": "sustained"
 },
 "length_m": 174.3780285525323,
 "start_elevation_m": 144.3300636279304,
 "end_elevation_m": 171.72743653899738,
 "endpoint_gain_m": 27.39737291106698,
 "overall_gradient_pct": 15.711482196745548,
 "accumulated_ascent_m": 27.399972510480467,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 21.38349776772486,
   "start_distance_m": 94.0,
   "end_distance_m": 99.0,
   "midpoint_distance_m": 96.5,
   "start_elevation_m": 159.12599074589536,
   "end_elevation_m": 160.1951656342816,
   "start_xy": [
    268933.93205885036,
    4683340.079521218
   ],
   "end_xy": [
    268929.0844204175,
    4683341.304429894
   ]
  },
  "max_10m": {
   "gradient_pct": 21.113081347235436,
   "start_distance_m": 89.0,
   "end_distance_m": 99.0,
   "midpoint_distance_m": 94.0,
   "start_elevation_m": 158.08385749955806,
   "end_elevation_m": 160.1951656342816,
   "start_xy": [
    268938.77987507184,
    4683338.85531848
   ],
   "end_xy": [
    268929.0844204175,
    4683341.304429894
   ]
  },
  "max_20m": {
   "gradient_pct": 20.880071346656166,
   "start_distance_m": 79.0,
   "end_distance_m": 99.0,
   "midpoint_distance_m": 89.0,
   "start_elevation_m": 156.01915136495037,
   "end_elevation_m": 160.1951656342816,
   "start_xy": [
    268948.4936981827,
    4683336.4802466845
   ],
   "end_xy": [
    268929.0844204175,
    4683341.304429894
   ]
  },
  "max_25m": {
   "gradient_pct": 20.794741352030087,
   "start_distance_m": 74.0,
   "end_distance_m": 99.0,
   "midpoint_distance_m": 86.5,
   "start_elevation_m": 154.9964802962741,
   "end_elevation_m": 160.1951656342816,
   "start_xy": [
    268953.34360442567,
    4683335.264355798
   ],
   "end_xy": [
    268929.0844204175,
    4683341.304429894
   ]
  },
  "max_50m": {
   "gradient_pct": 20.634245407694152,
   "start_distance_m": 69.0,
   "end_distance_m": 119.0,
   "midpoint_distance_m": 94.0,
   "start_elevation_m": 153.96773398302372,
   "end_elevation_m": 164.2848566868708,
   "start_xy": [
    268958.1930229736,
    4683334.04651587
   ],
   "end_xy": [
    268909.72642189387,
    4683346.3277325705
   ]
  },
  "max_100m": {
   "gradient_pct": 20.04166942184682,
   "start_distance_m": 38.0,
   "end_distance_m": 138.0,
   "midpoint_distance_m": 88.0,
   "start_elevation_m": 147.9016792913669,
   "end_elevation_m": 167.9433487132137,
   "start_xy": [
    268988.49756681843,
    4683327.5765443705
   ],
   "end_xy": [
    268891.3857530376,
    4683351.288465855
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 0.9576864107538086,
   "start_distance_m": 2.0,
   "end_distance_m": 7.0,
   "midpoint_distance_m": 4.5,
   "start_elevation_m": 144.39607867271505,
   "end_elevation_m": 144.44396299325274,
   "start_xy": [
    269023.9715900541,
    4683324.875943741
   ],
   "end_xy": [
    269019.01803744776,
    4683324.1960051395
   ]
  },
  "min_10m": {
   "gradient_pct": 1.5561578028379586,
   "start_distance_m": 2.0,
   "end_distance_m": 12.0,
   "midpoint_distance_m": 7.0,
   "start_elevation_m": 144.39607867271505,
   "end_elevation_m": 144.55169445299885,
   "start_xy": [
    269023.9715900541,
    4683324.875943741
   ],
   "end_xy": [
    269014.06448484154,
    4683323.516066537
   ]
  },
  "min_20m": {
   "gradient_pct": 4.8266697747760645,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 144.3300636279304,
   "end_elevation_m": 145.2953975828856,
   "start_xy": [
    269025.953,
    4683325.148
   ],
   "end_xy": [
    269006.1823310797,
    4683324.222586388
   ]
  },
  "min_25m": {
   "gradient_pct": 6.433099102578581,
   "start_distance_m": 0.0,
   "end_distance_m": 25.0,
   "midpoint_distance_m": 12.5,
   "start_elevation_m": 144.3300636279304,
   "end_elevation_m": 145.93833840357505,
   "start_xy": [
    269025.953,
    4683325.148
   ],
   "end_xy": [
    269001.26997493254,
    4683325.154653776
   ]
  },
  "min_50m": {
   "gradient_pct": 11.723997295575145,
   "start_distance_m": 0.0,
   "end_distance_m": 50.0,
   "midpoint_distance_m": 25.0,
   "start_elevation_m": 144.3300636279304,
   "end_elevation_m": 150.19206227571797,
   "start_xy": [
    269025.953,
    4683325.148
   ],
   "end_xy": [
    268976.7077235365,
    4683329.812514686
   ]
  },
  "min_100m": {
   "gradient_pct": 16.064545988590822,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 144.3300636279304,
   "end_elevation_m": 160.39460961652122,
   "start_xy": [
    269025.953,
    4683325.148
   ],
   "end_xy": [
    268928.1148695446,
    4683341.549319878
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 21.72085558324426,
   "start_distance_m": 97.0,
   "end_distance_m": 99.0,
   "midpoint_distance_m": 98.0,
   "start_elevation_m": 159.76074852261672,
   "end_elevation_m": 160.1951656342816,
   "start_xy": [
    268931.0234646289,
    4683340.814422255
   ],
   "end_xy": [
    268929.0844204175,
    4683341.304429894
   ]
  },
  "max_3m": {
   "gradient_pct": 21.57361179873476,
   "start_distance_m": 96.0,
   "end_distance_m": 99.0,
   "midpoint_distance_m": 97.5,
   "start_elevation_m": 159.54795728031957,
   "end_elevation_m": 160.1951656342816,
   "start_xy": [
    268931.9930154768,
    4683340.569532173
   ],
   "end_xy": [
    268929.0844204175,
    4683341.304429894
   ]
  }
 },
 "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": {
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.199,
   "obstruction_max_height_m": 17.86,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": [
   "may_start_earlier",
   "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:26919",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/ma-east/USGS_1M_19_x26y469_MA_CentralEastern_2021_B21.tif"
  ],
  "calculated_at": "2026-09-03T22:36:53+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": "canopy-tail-260903",
  "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_CentralEastern_2021_B21 (collected 2021)",
  "elevation_tile_ids": [
   "x26y469"
  ],
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://usgs-lidar-public.s3-us-west-2.amazonaws.com/MA_CentralEastern_1_2021",
   "ept_crs": "EPSG:3857",
   "station_coverage": 1.0,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Worcester",
  "county": "Massachusetts"
 }
}