{
 "source": "AWS Terrain Tiles (terrarium, public): s3.amazonaws.com/elevation-tiles-prod. Land and coastline from each layer's tileZoom; the sea floor is ETOPO1 (zoom 9), eased to the coastline at 25 m per km in the finer layers. Each layer takes the next finer layer's heights where that layer draws, so the seams meet.",
 "format": "raw deflate of: little-endian uint16 W, uint16 H, then W*H low bytes and W*H high bytes of each cell's zigzagged residual, the int16 metres (signed) less the LOCO-I median prediction from the west, north and north-west cells (the first row from the west, the first column from the north, the first cell from 0); rows north to south, columns west to east; even lon/lat grid, corners included.",
 "layers": {
  "bay": {
   "file": "terrain-bay.391aec3020.bin",
   "name": "Casco Bay",
   "lon0": -70.42,
   "lon1": -69.9,
   "lat0": 43.5,
   "lat1": 43.8,
   "w": 640,
   "h": 510,
   "kmW": 41.88,
   "kmH": 33.34,
   "min": -111,
   "max": 153,
   "tileZoom": 12
  },
  "land": {
   "file": "terrain-land.019ebe0a62.bin",
   "name": "Coast to the mountains",
   "lon0": -71.95,
   "lon1": -69.25,
   "lat0": 43.3,
   "lat1": 46.3,
   "w": 520,
   "h": 812,
   "kmW": 213.27,
   "kmH": 333.39,
   "min": -195,
   "max": 1860,
   "tileZoom": 10
  },
  "gulf": {
   "file": "terrain-gulf.d22c9fa315.bin",
   "name": "Gulf of Maine",
   "lon0": -72.1,
   "lon1": -65.6,
   "lat0": 41.6,
   "lat1": 46.9,
   "w": 560,
   "h": 636,
   "kmW": 518.3,
   "kmH": 588.99,
   "min": -1740,
   "max": 1763,
   "tileZoom": 8
  },
  "world": {
   "file": "terrain-world.9eb8b07fb9.bin",
   "name": "The Northeast",
   "lon0": -83.0,
   "lon1": -55.7,
   "lat0": 33.5,
   "lat1": 53.4,
   "w": 420,
   "h": 421,
   "kmW": 2206.26,
   "kmH": 2211.49,
   "min": -5921,
   "max": 1553,
   "tileZoom": 6
  }
 }
}