{
  "name": "sinuosity",
  "type": "function",
  "groups": ["GeometryGroup"],
  "description": "Returns the sinuosity of a curve, which is the ratio of the curve length to the straight (2D) distance between its endpoints.",
  "arguments": [
    {"arg":"geometry", "description": "Input curve (circularstring, linestring)"}
  ],
  "examples": [
    { "expression":"round(sinuosity(geom_from_wkt('LINESTRING(2 0, 2 2, 3 2, 3 3)')), 3)", "returns":"1.265"},
    { "expression":"sinuosity(geom_from_wkt('LINESTRING( 3 1, 5 1)'))", "returns":"1.0"}
  ]
}