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      ],
      "notes": [
        "This generalized terrain model is for visualization, not surveying or navigation.",
        "Shorelines are derived from the 0.5 m contour of the sampled DEM, not a surveyed tidal coastline.",
        "Contours and shorelines use the unrounded sampled elevations; the mesh elevation array is rounded to whole meters.",
        "Bare-earth terrain omits buildings, trees, bridge decks, atmospheric refraction, and tides.",
        "The regular geographic grid is approximately 35.23 m east-west by 35.87 m north-south at its center.",
        "Grid spacing and encoded vertical precision are not guarantees of source survey accuracy."
      ]
    },
    {
      "file": "terrain-detail.json",
      "bounds": {
        "west": -122.55828125,
        "east": -122.44296875,
        "south": 37.7834375,
        "north": 37.87625
      },
      "width": 577,
      "height": 577,
      "sampleSpacingMeters": {
        "eastWest": 17.6,
        "northSouth": 17.94,
        "sourcePixelAtCenter": 15.09
      },
      "sources": [
        {
          "name": "Mapzen Terrain Tiles on AWS",
          "url": "https://registry.opendata.aws/terrain-tiles/",
          "template": "https://s3.amazonaws.com/elevation-tiles-prod/terrarium/{z}/{x}/{y}.png",
          "zoom": 13,
          "dataset": "terrain-detail.json",
          "attribution": "Terrain: Mapzen and U.S. Geological Survey 3DEP, GMTED2010, SRTM. Bathymetry: NOAA ETOPO1.",
          "licenseUrl": "https://github.com/tilezen/joerd/blob/master/docs/attribution.md",
          "accessed": "2026-11-08",
          "tiles": [
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              "sha256": "9721fdea8e6ff567c80cc254be69917c91bcce8172bf1766d8c39f5a64f53f13"
            },
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              "sha256": "c033d775c2309809be12e2e0e301093ef23818eec805435cdb091285185cd39d"
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          ]
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      ],
      "notes": [
        "This generalized terrain model is for visualization, not surveying or navigation.",
        "Shorelines are derived from the 0.5 m contour of the sampled DEM, not a surveyed tidal coastline.",
        "Contours and shorelines use the unrounded sampled elevations; the mesh elevation array is rounded to whole meters.",
        "Bare-earth terrain omits buildings, trees, bridge decks, atmospheric refraction, and tides.",
        "The regular geographic grid is approximately 17.6 m east-west by 17.94 m north-south at its center.",
        "Grid spacing and encoded vertical precision are not guarantees of source survey accuracy."
      ]
    },
    {
      "file": "terrain-presidio.json",
      "bounds": {
        "west": -122.500625,
        "east": -122.446171875,
        "north": 37.8130859375,
        "south": 37.786015625
      },
      "width": 545,
      "height": 337,
      "sampleSpacingMeters": {
        "eastWest": 8.8,
        "northSouth": 8.97,
        "sourcePixelAtCenter": 7.55
      },
      "sources": [
        {
          "name": "Mapzen Terrain Tiles on AWS",
          "url": "https://registry.opendata.aws/terrain-tiles/",
          "template": "https://s3.amazonaws.com/elevation-tiles-prod/terrarium/{z}/{x}/{y}.png",
          "zoom": 14,
          "dataset": "terrain-presidio.json",
          "attribution": "Terrain: Mapzen and U.S. Geological Survey 3DEP, GMTED2010, SRTM. Bathymetry: NOAA ETOPO1.",
          "licenseUrl": "https://github.com/tilezen/joerd/blob/master/docs/attribution.md",
          "accessed": "2026-11-09",
          "tiles": [
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              "sha256": "1dd08dd15d3b6b5824b786776636543fda633a7074bcf5d8872e56136e9d60bd"
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              "sha256": "30f36f2147e7a5e27e2b9e031b23f8706cf60efbc767de653d190c8d9060f2e2"
            },
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              "sha256": "15e866bcab2276a500d152bd6c22409031efd2e2c8fafc7f8b242dda4334f3f8"
            },
            {
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              "sha256": "604ed14f7a22fd891403b3a13d109a7d136405df6b324de2d05fd4719dfc1a5d"
            },
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              "z": 14,
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              "sha256": "77b5f75867509d00824f2b679e91b75ff41b56dec37a0f929963e830cd81519f"
            }
          ]
        }
      ],
      "notes": [
        "This generalized terrain model is for visualization, not surveying or navigation.",
        "Shorelines are derived from the 0.5 m contour of the sampled DEM, not a surveyed tidal coastline.",
        "Contours and shorelines use the unrounded sampled elevations; the mesh elevation array is rounded to whole meters.",
        "Bare-earth terrain omits buildings, trees, bridge decks, atmospheric refraction, and tides.",
        "The regular geographic grid is approximately 8.8 m east-west by 8.97 m north-south at its center.",
        "Grid spacing and encoded vertical precision are not guarantees of source survey accuracy."
      ]
    }
  ]
}