{
  "id": "riggs-spring-corridor",
  "name": "Riggs Spring corridor",
  "group": "Beyond the road end",
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  "surface_method": "classified-ground",
  "source_ids": [
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    "nps-backcountry",
    "gnis"
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  "place_ids": [],
  "theme": "The southern backcountry slopes",
  "question": "How does a wooded valley sit below the high plateau?",
  "interaction": "section",
  "view_yaw": 1.4,
  "view_pitch": 1.12,
  "schema": 1,
  "kind": "landscape-study",
  "checked_at": "2026-10-02",
  "geometry_status": "Derived from source-classified ground returns; terrain study, not a closed rock scan",
  "coordinate_system": {
    "native_horizontal": "NAD83(2011) / UTM 12N (EPSG:6341)",
    "ept_horizontal": "WGS84 Pseudo-Mercator (EPSG:3857)",
    "export_horizontal": "WGS84 / UTM 12N (EPSG:32612)",
    "vertical": "NAVD88, Geoid12B; source heights retained",
    "units": "metres",
    "axes": "x east, y up from base_m, z south",
    "base_m": 2300,
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    "vertical_exaggeration": 1,
    "transform_note": "EPT projection transformed with pyproj; no claim of survey-grade datum alignment. Centimetre export quantization is not source accuracy."
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    "density_returns_per_m2": 39.781,
    "ground_returns": 6939721,
    "retained_returns": 6939721,
    "vegetation_candidate_returns": 25129409,
    "excluded_noise_or_other": 13312,
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    "cliff_or_small_patch_omission_fraction": 0.0007751672879404489,
    "maximum_3x3_relief_m": 12.0,
    "minimum_connected_patch_m2": 100.0,
    "maximum_nearest_fill_m": 3.0,
    "cell_m": 2.0,
    "distance_reference": "Distance between grid-node centers, not exact source-point XY.",
    "maximum_grid_bin_offset_m": 1.414213562373095,
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    "surface_heights_m": [
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    "intensity_display_percentiles": [
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    ],
    "vertical_surfaces": "Abrupt interpolated cliff nodes are omitted; directly sampled bins are retained. Connecting top-surface samples still does not measure a wall, undercut, window or unseen interior.",
    "surface_method": "classified-ground"
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    "file": "returns.glb.gz",
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    "count": 120000,
    "sampling": "fixed seed 20261002, uniform without replacement from valid crop returns"
  },
  "profiles": "profiles.json.gz",
  "coverage": {
    "image": "coverage.webp",
    "data": "coverage.json.gz",
    "nodes": 513,
    "orientation": "north up; west left"
  },
  "camera": {
    "yaw": 1.4,
    "pitch": 1.12,
    "distance_m": 2048.0,
    "target": [
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    "limits": {
      "minimum_distance_widths": 1.35,
      "maximum_distance_widths": 4,
      "minimum_pitch_radians": 1.0,
      "maximum_pitch_radians": 1.55
    },
    "scope": "Above-terrain observation only; no ground-level camera or visitor-viewpoint equivalence."
  },
  "bounds_local": [
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      -512.0
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    [
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  "source_dataset": {
    "id": "USGS_LPC_UT_Southern_QL1_2018_LAS_2019",
    "acquired": "2018-04-27 / 2018-07-29 project interval",
    "published": "2019-06-03",
    "url": "https://registry.opendata.aws/usgs-lidar/",
    "license": "US Government Public Domain",
    "credit": "Map services and data available from U.S. Geological Survey, National Geospatial Program."
  },
  "processing": {
    "mesh": "Source class 2 ground only. Highest retained return per nearest grid node; nearest interpolation up to 3 m; isolated spikes exceeding all 8 neighbors by 6 m lowered to neighbor maximum. Interpolated nodes with more than 12 m relief across a 3x3 neighborhood and connected patches smaller than 100 m² are omitted. Directly sampled ground bins otherwise remain, including steep rims. Original returns are unchanged. No morphological closing.",
    "vegetation": "Source classes 3/4/5 plus low-intensity multiple echoes and low-intensity raised returns over nearby gentle classified ground are excluded. This is an imperfect heuristic, not a species/rock classifier.",
    "lighting": "Normals and static 12-direction terrain occlusion are derived; material color, studio lighting and display category colors are illustrative.",
    "detail": "Three nested node grids; no-data cells omitted at every LOD; low LOD can omit extra edge triangles to preserve holes."
  },
  "limitations": [
    "Hidden rock surfaces, undercuts and windows are not reconstructed.",
    "Abrupt interpolated cliff nodes are omitted; connections between directly sampled bins are derived facets, not measured wall surfaces.",
    "Ground classification can omit standing rock or retain classification errors; inspect the return view.",
    "NAIP is overhead imagery from a different year; it cannot supply photographic detail on vertical faces.",
    "The cut boundary is an editorial crop; there is no modeled geology beneath it.",
    "No route, current condition, erosion rate or collapse forecast is inferred."
  ],
  "posters": {
    "large": "poster.webp",
    "small": "poster-small.webp",
    "material": "aerial",
    "geometry_year": 2018,
    "imagery_year": 2024,
    "kind": "actual model render, not a ground photograph"
  },
  "quality_status": "qualified-ground-terrain-with-visible-omissions",
  "editorial": {
    "lede": "South of the high rim, broad wooded slopes replace the familiar amphitheater view.",
    "body": "The Riggs Spring Loop enters the forested backcountry below Rainbow and Yovimpa Points. This separate crop studies part of the eastern slope and Corral Hollow setting. It does not repeat the earlier high-rim model or attempt to model the entire loop.",
    "lesson": "Use the section to read the relief beneath the canopy. Compare it with the broader NPS topographic map: this one-kilometre square is a small part of the loop's landscape. The spring and much of the route are beyond its edges.",
    "limit": "A corridor landscape, with no delivered trail polyline or water-source location. It cannot establish current trail access, water availability, route distance or hiking ascent. Ground-class gaps remain open.",
    "caption": "A separate ground-surface crop in the Riggs Spring backcountry, east and below the high southern rim.",
    "comparison": "NPS pages publish differing loop lengths and ascent figures. Those operational numbers are not reused here; this exhibit measures only its terrain footprint."
  },
  "sources": [
    {
      "id": "nps-riggs",
      "title": "Riggs Spring Loop Trail",
      "url": "https://www.nps.gov/brca/planyourvisit/riggsspringloop.htm",
      "publisher": "National Park Service",
      "date": "2021-09-21",
      "retrieved_at": "2026-10-02",
      "license": "Facts paraphrased and linked. Photograph rights recorded separately per image.",
      "supports": "Forest and slope setting; NPS-credited historical topographic map used for comparison. Published route metrics differ from newer NPS records and are not used."
    },
    {
      "id": "nps-backcountry",
      "title": "Backcountry Hiking and Camping",
      "url": "https://www.nps.gov/thingstodo/backcountry-hiking-and-camping.htm",
      "publisher": "National Park Service",
      "date": null,
      "retrieved_at": "2026-10-02",
      "license": "Facts paraphrased and linked. Photograph rights recorded separately per image.",
      "supports": "Riggs/Under-the-Rim context and source disagreement record, not current trip guidance."
    },
    {
      "id": "gnis",
      "title": "Geographic Names — Landforms",
      "url": "https://carto.nationalmap.gov/arcgis/rest/services/geonames/MapServer/5",
      "publisher": "US Geological Survey",
      "date": null,
      "retrieved_at": "2026-10-02",
      "license": "US Government Public Domain; USGS National Map terms",
      "supports": "Independent named-feature locators, including Hat Shop 1441625, Farview 1441016, Piracy 1444459 and Corral Hollow 1439972. Points do not define a feature boundary. Valley records include multiple positions, not a trail polyline."
    }
  ],
  "imagery": {
    "publisher": "USDA Farm Service Agency / FPAC",
    "dataset": "National Agriculture Imagery Program (NAIP), Utah 2024",
    "retrieved_at": "2026-10-02T09:10:57.371208+00:00",
    "source_pixels_m": 0.6,
    "export_pixels": 1707,
    "export_pixel_m": 0.5998828353837141,
    "crs": "EPSG:32612",
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      "spatialReference": {
        "wkid": 32612,
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    "flight_dates": [
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    "images": [
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    "catalog_url": "https://apps.geo.fpac.usda.gov/geo-imagery/rest/services/naip/conus_naip/ImageServer/query?f=json&geometry=%7B%22xmin%22%3A390341.52953982295%2C%22ymin%22%3A4146483.952784525%2C%22xmax%22%3A391365.52953982295%2C%22ymax%22%3A4147507.952784525%2C%22spatialReference%22%3A%7B%22wkid%22%3A32612%7D%7D&geometryType=esriGeometryEnvelope&inSR=32612&spatialRel=esriSpatialRelIntersects&outFields=%2A&returnGeometry=false&where=Category%3D1+AND+year_ts%3D2024",
    "export_url": "https://apps.geo.fpac.usda.gov/geo-imagery/rest/services/naip/conus_naip/ImageServer/exportImage?f=json&bbox=390341.52953982295%2C4146483.952784525%2C391365.52953982295%2C4147507.952784525&bboxSR=32612&imageSR=32612&size=1707%2C1707&format=png&pixelType=U8&interpolation=RSP_BilinearInterpolation&adjustAspectRatio=false&bandIds=0%2C1%2C2&mosaicRule=%7B%22mosaicMethod%22%3A%22esriMosaicLockRaster%22%2C%22lockRasterIds%22%3A%5B195919%5D%2C%22mosaicOperation%22%3A%22MT_FIRST%22%7D",
    "direct_image_url": "https://apps.geo.fpac.usda.gov/geo-imagery/rest/services/naip/conus_naip/ImageServer/exportImage?f=image&bbox=390341.52953982295%2C4146483.952784525%2C391365.52953982295%2C4147507.952784525&bboxSR=32612&imageSR=32612&size=1707%2C1707&format=png&pixelType=U8&interpolation=RSP_BilinearInterpolation&adjustAspectRatio=false&bandIds=0%2C1%2C2&mosaicRule=%7B%22mosaicMethod%22%3A%22esriMosaicLockRaster%22%2C%22lockRasterIds%22%3A%5B195919%5D%2C%22mosaicOperation%22%3A%22MT_FIRST%22%7D",
    "original_sha256": "9a86a17a489ec894bd5f781979e705ec387a5f65ebc48d1fa2b47a5ac88973ed",
    "license": "US Government Public Domain",
    "license_url": "https://catalog.data.gov/dataset/national-agriculture-imagery-program-naip-imagery",
    "processing": "Locked 2024 primary rasters, RGB bands 0/1/2, orthographic drape; bilinear export, WebP encoding. No invented detail.",
    "limitations": "Leaf-on aerial imagery draped on 2018 filtered topography; acquisition shadows, tree crowns, temporal differences and metre-scale registration error remain. Cliff faces stretch a top-down pixel; hidden walls are not photographed."
  },
  "visual_review": {
    "checked_at": "2026-10-02",
    "views": [
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    "scope": "Above-terrain ground study only. Visible gaps remain; neither closed cliffs nor cap/neck fidelity is accepted.",
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