QGIS/resources/function_help/json/bearing

{
  "name": "bearing",
  "type": "function",
  "groups": ["GeometryGroup"],
  "description": "Returns the north-based bearing as the angle in radians measured clockwise on the ellipsoid from the vertical on point_a to point_b.",
  "arguments": [{
    "arg": "point_a",
    "description": "point geometry"
  }, {
    "arg": "point_b",
    "description": "point geometry"
  }, {
    "arg": "source_crs",
    "optional": true,
    "description": "an optional string representing the source CRS of the points. By default the current layer's CRS is used."

  }, {
    "arg": "ellipsoid",
    "optional": true,
    "description": "an optional string representing the acronym or the authority:ID (eg 'EPSG:7030') of the ellipsoid on which the bearing should be measured. By default the current project's ellipsoid setting is used."  

  }],
  "examples": [{
    "expression": "degrees( bearing( make_point(16198544, -4534850), make_point(18736872, -1877769), 'EPSG:3857', 'EPSG:7030') )",
    "returns": "49.980071"
  }, {
    "expression": "degrees( bearing( make_point(18736872, -1877769), make_point(16198544, -4534850), 'EPSG:3857', 'WGS84') )",
    "returns": "219.282386"
  }],
  "tags": ["measured", "clockwise", "points", "angle", "vertical", "north", "azimuth", "bearing", "radians", "ellipsoid"]
}