{
  "date": "2026-11-02",
  "status": "qualified_horizontal_terminal_spot_check",
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  "coordinates_changed": false,
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  "mapped_sections": 20,
  "major_aerial_lifts": 13,
  "carpet_sections": 7,
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  "maximum_landmark_separation_m": 12.17,
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  "picking_uncertainty_m": 10,
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      "id": "99979748",
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      "lift": "Ruby Express",
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      "id": "99979750",
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      "id": "99979747",
      "type": "chair_lift",
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      "lift": "Outback Express",
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      "id": "99979747",
      "type": "chair_lift",
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    {
      "lift": "Outpost Gondola",
      "endpoint_index": 0,
      "frame": "naip_103287821-first",
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      "id": "103287821",
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      "lift": "Outpost Gondola",
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      "id": "103287821",
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      "lift": "Bergman Express",
      "endpoint_index": 0,
      "frame": "bergman_bottom",
      "picked_pixel": [
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      "id": "868873488",
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      "lift": "Bergman Express",
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      "frame": "bergman_top",
      "picked_pixel": [
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      "id": "868873488",
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    {
      "lift": "Discovery",
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      "id": "17143975",
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    {
      "lift": "A-51",
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      "id": "17143979",
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    {
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      "id": "17143983",
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      "landmark_separation_m": 0.92,
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    {
      "lift": "Montezuma Express",
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      "frame": "montezuma",
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      "lift": "Montezuma Express",
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      "id": "17144349",
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    {
      "lift": "River Run Gondola",
      "endpoint_index": 0,
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      "picked_pixel": [
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      "id": "67566953",
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      "lift": "River Run Gondola",
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      "id": "67566953",
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    {
      "lift": "Summit Express",
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      "id": "99979746",
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      "lift": "Summit Express",
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      "id": "99979746",
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      "lift": "Ranger",
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      "id": "103287339",
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      "lift": "Sun Kid Lower",
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      "lift": "Sun Kid Upper",
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      "id": "258685060",
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    {
      "lift": "Sun Kid Upper",
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      "id": "258685060",
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    {
      "lift": "Double Barrel",
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      "id": "258685061",
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    {
      "lift": "Double Barrel",
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      "id": "258685061",
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    {
      "lift": "Kokomo",
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      "id": "258685916",
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    {
      "lift": "Mid-Station Ski School",
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      "frame": "midstation",
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      "id": "1125336833",
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      "lift": "Mid-Station Ski School",
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    {
      "lift": "Cadillac",
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      "frame": "midstation",
      "picked_pixel": [
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      "id": "1349729263",
      "type": "magic_carpet",
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    {
      "lift": "Cadillac",
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      "id": "1349729263",
      "type": "magic_carpet",
      "landmark_separation_m": 2.66,
      "within_review_tolerance": true
    },
    {
      "lift": "Tubing Hill",
      "endpoint_index": 0,
      "frame": "tubing",
      "picked_pixel": [
        430,
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      ],
      "id": "258685915",
      "type": "magic_carpet",
      "landmark_separation_m": 2.65,
      "within_review_tolerance": true
    },
    {
      "lift": "Tubing Hill",
      "endpoint_index": -1,
      "frame": "tubing",
      "picked_pixel": [
        160,
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      "id": "258685915",
      "type": "magic_carpet",
      "landmark_separation_m": 7.24,
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    }
  ],
  "bowl_coverage": {
    "Bergman Bowl": {
      "operator_named_routes": 13,
      "matched": 13,
      "source_label_aliases": {
        "Jane's Journey": "Jane's Journey",
        "Miners": "Miners",
        "Quandary": "Quandary",
        "Ten Mile": "Ten Mile",
        "Thorne": "Thorne",
        "Ute": "Ute",
        "Buffalo": "Buffalo",
        "Ptarmigan": "Ptarmigan",
        "Red": "Red",
        "Torreys": "Torrey's",
        "Grays": "Gray's",
        "Wichita": "Wichita",
        "Uneva": "Uneva"
      },
      "boundary_polygon_verified": false
    },
    "Erickson Bowl": {
      "operator_named_routes": 3,
      "matched": 3,
      "source_label_aliases": {
        "Tenderfoot": "Tenderfoot Glades",
        "Nuchu": "Nuchu",
        "Silverheels": "Silver Heels"
      },
      "boundary_polygon_verified": false
    }
  },
  "bergman_upper_ground_m": 3741.89,
  "operator_upper_reference_m": 3743.55,
  "bergman_height_difference_m": -1.66,
  "sources": {
    "operator_bowls": "https://www.keystoneresort.com/the-mountain/about-the-mountain/capital-investments.aspx",
    "naip": "USDA / USGS, 22 September 2019, public domain",
    "recent": {
      "provider": "Esri / Vantor Vivid; reference viewing only, no pixels or traced coordinates added to the map",
      "dates_covering_resort": [
        "2023-08-20",
        "2025-04-23",
        "2025-07-27"
      ],
      "declared_resolution_m": [
        0.34,
        0.46,
        0.5
      ],
      "declared_accuracy_m": 8.47,
      "bergman_point_date": "2023-08-20",
      "limits": "Dates vary across the mosaic. Bergman image is construction-stage; terminal structure footprint is visible, not certification of final engineering cable endpoints."
    }
  },
  "limits": [
    "Manually interpreted roof/frame centres and conveyor ends, not surveyed engineering cable endpoints.",
    "Image registration, viewing geometry, station size and picking uncertainty limit true accuracy; numerical separations are not an accuracy guarantee.",
    "Bergman reference shows terminal structures during August 2023 construction, not final as-built certification.",
    "Twenty mapped lift sections are not the official physical lift count; Sun Kid is split and Double Barrel is one mapped line.",
    "All 16 operator-named Bergman/Erickson routes are present; this does not verify exact piste edges, bowl boundaries, every connector or the full resort inventory.",
    "North/South/Independence bowl boundary coverage and current lift/trail operation are not certified."
  ]
}