API Reference > imodeljs-common > Geometry > GeodeticDatumProps GeodeticDatumProps Interface This interface represents a geodetic datum. Geodetic datums are based on an ellipsoid. In addition to the ellipsoid definition they are the base for longitude/latitude coordinates. Geodetic datums are the basis for geodetic transformations. Most geodetic datums are defined by specifying the transformation to the common base WGS84 (or local equivalent). The transforms property can contain the definition of the transformation path to WGS84. Sometimes there exists transformation paths direct from one non-WGS84 datum to another non-WGS84. The current model does not allow specifications of these special paths at the moment. Implemented by GeodeticDatum Properties Name Type Description deprecated undefined | boolean If true then indicates the definition is deprecated. description undefined | string Description ellipsoid undefined | GeodeticEllipsoidProps The full definition of the geodetic ellipsoid associated to the datum. ellipsoidId undefined | string The key name to the base Ellipsoid. epsg undefined | number The EPSG code of the geodetic datum. id undefined | string GeodeticDatum key name source undefined | string A textual description of the source of the geodetic datum definition. transforms undefined | GeodeticTransformProps[] The transformation to WGS84. Defined in core/common/src/geometry/GeodeticDatum.ts Line 456 Last Updated: 12 June, 2024