{
  "name": "raster_value",
  "type": "function",
  "description": "Returns the raster value found at the provided point.",
  "arguments": [ {"arg":"layer","description":"the name or id of a raster layer"},
                 {"arg":"band","description":"the band number to sample the value from."},
                 {"arg":"point","description":"point geometry (for multipart geometries having more than one part, a null value will be returned)"}],
  "examples": [ { "expression":"raster_value('dem', 1, make_point(1,1))", "returns":"25"}]
}