{
 "description": "Get elevation values at a location, along geometries, or interpolated over an extent, LOS (line of sight), contour, aspect, slope, locate, locate all, steepest path, normal, surface lenght ...",
 "surfaceLayers": [
  {
   "id": 0,
   "name": "va_dem",
   "type": "Raster Layer",
   "full extent": {
    "xmin": -376537.8196122456,
    "ymin": 57446.043437353335,
    "xmax": 383902.1803877544,
    "ymax": 395696.04343735334,
    "spatialReference": {
     "wkid": 6591,
     "latestWkid": 6591
    }
   },
   "description": ""
  }
 ]
}