{
  "schema_version": 1,
  "scene_id": "ojai-usgs-terrain-baseline-v1",
  "coordinate_frame": {
    "kind": "projected_offset",
    "axes": "grid_easting_grid_northing_up",
    "horizontal_crs": "EPSG:26911",
    "vertical_datum": "NAVD88 metres; geoid model not encoded in this crop",
    "origin_xyz": [
      288643.499699997,
      3817781.5,
      340.0
    ],
    "meters_per_unit": 1
  },
  "collision": {
    "path": "terrain.mesh.json",
    "sha256": "7d1c87781dc9556af15dcf03e033e028b1f82c90a7d6bf0ee9e85c5cc2f0d2cc"
  },
  "appearance": null,
  "sources": [
    {
      "id": "usgs-dem-crop",
      "url": "https://prd-tnm.s3.amazonaws.com/StagedProducts/Elevation/1m/Projects/CA_SoCal_Wildfires_B3_2018/TIFF/USGS_one_meter_x28y382_CA_SoCal_Wildfires_B3_2018.tif",
      "catalog_url": "https://www.sciencebase.gov/catalog/item/5eaa4a5482cefae35a21f048",
      "rights": "USGS public domain; modifications documented",
      "captured_at": null,
      "capture_start": null,
      "capture_end": null,
      "crop_sha256": "46b64e1ca8f4a7460535d523792b4e97e20458544cf4261dd194e24a89a1f48f"
    }
  ],
  "evidence": {
    "classification": "captured",
    "independent_validation": false
  },
  "processing": {
    "input_sha256": "46b64e1ca8f4a7460535d523792b4e97e20458544cf4261dd194e24a89a1f48f",
    "source_crs": "EPSG:26911",
    "input_shape": [
      170,
      142
    ],
    "input_pixel_size_m": [
      1.0,
      1.0
    ],
    "sample_stride": 4,
    "sample_shape": [
      43,
      36
    ],
    "resampling": "none; retained pixel-center samples only",
    "mesh": "adjacent samples only; omit each cell containing any full-resolution nodata",
    "height_handling": "input metres retained; no geoid or vertical datum conversion",
    "source_bounds": [
      288642.999699997,
      3817780.0,
      288784.999699997,
      3817950.0
    ]
  },
  "limitations": [
    "Bare-earth terrain only; buildings, vegetation and cables absent",
    "No captured appearance, Gaussian splats or texture",
    "Historical survey; contemporary hazards unknown",
    "Raster triangulation is a terrain approximation, not independent ground truth",
    "No Isaac Sim or RGB/depth/LiDAR validation"
  ]
}