{
  "revision": "DTM-R01",
  "created": "2026-10-30",
  "classificationUsed": 2,
  "objAxes": "X east, Y north, Z NAVD88 metres (Z-up)",
  "gridCellMetres": 4.0,
  "method": "Median ground-classified elevation per occupied 4m cell; triangle pair only where all four neighboring cells contain ground points; no gap filling or hydro breaklines. Cell centers are interpolated representatives, not measured spot coordinates.",
  "groundPointsUnique": 110780,
  "inputSamples": [
    {
      "file": "jambo-lidar.ply",
      "sha256": "9207d198039c0311a9617f2e6b43d4591adc7e9a4196df9985c9292366a7ebf8",
      "pointCount": 120000,
      "groundClass2Count": 25411,
      "bytes": 2160479
    },
    {
      "file": "jambo-lobby-dense-lidar.ply",
      "sha256": "c0289949c831ea4fef34c07fdd75a36b1c32fc49030590802d08173231075eac",
      "pointCount": 650000,
      "groundClass2Count": 86031,
      "bytes": 11700479
    }
  ],
  "meshVertices": 14172,
  "meshTriangles": 17048,
  "surfaceAreaPlanMetres2": 136384.0,
  "elevationRangeNAVD88Metres": [
    29.389999389648438,
    37.58500099182129
  ],
  "boundsModelXYZ": [
    [
      -250.0,
      -4.6100006103515625,
      -466.0
    ],
    [
      434.0,
      3.585000991821289,
      290.0
    ]
  ],
  "originEPSG3857": [
    -9084054.0,
    3293502.0,
    34.0
  ],
  "horizontalFrame": "WGS84 ellipsoid local east/north, matching the retained exterior GLB frame",
  "verticalDatum": "Source NAVD88 metres; 34m subtracted for model display",
  "collectionDates": [
    "2018-12-04",
    "2019-04-12"
  ],
  "source": "USGS 3DEP / FDEM Orange 2018",
  "sourceURL": "https://s3-us-west-2.amazonaws.com/usgs-lidar-public/FL_Peninsular_FDEM_Orange_2018/ept.json",
  "metadataURL": "https://www.fisheries.noaa.gov/inport/item/69496",
  "officialDEMMetadataURL": "https://www.fisheries.noaa.gov/inport/item/75872",
  "license": "US Government public domain; source credit retained",
  "access": "Existing retained public point samples reused; no paid access or private files transmitted",
  "coverage": "Sampled source points intersect Jambo House and adjoining resort grounds; gaps remain. This is not complete property coverage.",
  "pointFootprintEPSG3857": [
    -9084338.300048828,
    3293172.880004883,
    -9083559.150024414,
    3294033.0100097656
  ],
  "sourceNominalPulseSpacingMetres": 0.35,
  "densityStatement": "Input is a sampled subset. Nominal collection spacing is not local retained point density or DTM accuracy.",
  "accuracy": "Derived archival terrain estimate, not a commissioned/current topographic survey. No quantified accuracy accepted for this derived surface; no new checkpoints or breakline verification. Interior/marked-scope alignment remains unconfirmed. Do not use for grading, drainage design or construction.",
  "meshSHA256": "3f1cc8057011bb7d62f18d67c47bfb9ebfc02e06f65bf97b396ba5f8fe720d7d",
  "originalExteriorSHA256": "c6158e635bcc8d07fa2d644c8462ca17df1f9da9170e99c7b54cfc3e4da4acfc",
  "files": {
    "mesh": "terrain-dtm-r01.json",
    "obj": "terrain-dtm-r01.obj",
    "grid": "terrain-grid-r01.csv",
    "drawing": "terrain-plan-r01.svg"
  }
}