{
  "certificateVersion": "2026.11-V2",
  "sku": "AW-TJ-004",
  "slug": "valdez",
  "name": "Valdez — Port Valdez & Keystone Canyon",
  "category": "Coastal / Fjord (Mixed)",
  "gnisId": "1415537",
  "gnisUrl": "https://edits.nationalmap.gov/apps/gaz-domestic/public/search/names/1415537",
  "coordinates": {
    "latitude": 61.1308,
    "longitude": -146.3483
  },
  "boundingBox": [
    -146.68332640204397,
    60.965763290725654,
    -146.01283064995602,
    61.289518855274416
  ],
  "horizontalCrs": "EPSG:3338 (NAD83 / Alaska Albers Equal Area Conic)",
  "verticalDatum": "MLLW (<0m marine soundings) / NAVD88 (>0m terrestrial elevation)",
  "maxElevationM": 2558,
  "maxDepthM": -310,
  "chartId": "NOAA Chart 16707 (Valdez Arm & Port Valdez)",
  "verifiedFeatures": [
    "VALDEZ",
    "POTATO POINT LIGHT",
    "PORT VALDEZ",
    "SHOUP BAY",
    "ALLISON POINT",
    "SUGARLOAF MTN",
    "ENTRANCE POINT",
    "HARBOR BREAKWATER",
    "KEYSTONE CANYON"
  ],
  "sources": [
    {
      "provider": "NOAA National Centers for Environmental Information (NCEI)",
      "dataset_name": "NOAA NCEI Regional Alaska Bathymetric-Topographic DEM Mosaic (DEM_global_mosaic) & NOAA Chart 16707 (Valdez Arm & Port Valdez)",
      "dataset_id": "NOAA-NCEI-DEM-MOSAIC-AW-TJ-004",
      "acquisition_method": "Compiled bathymetric-topographic DEM mosaic (integrating NOAA hydrographic survey soundings and USGS 3DEP/IfSAR land elevation)",
      "resolution": "1/3 arc-second (~10m) to 1 arc-second regional coastal DEM mosaic (1400x1400 Float32 extract)",
      "horizontal_crs": "EPSG:4326 (WGS84/NAD83) projected to EPSG:3338 (Alaska Albers)",
      "vertical_datum": "Mixed coastal mosaic: MLLW/MHW marine soundings + NAVD88/MSL terrestrial elevation (requires explicit VDatum separation review per Rule 4)"
    }
  ],
  "contactSheetUrl": "/products/AW-TJ-004/qa/contact-sheet-8panel.webp",
  "verifiedAt": "2026-11-09T17:00:00Z"
}