API Reference > imodeljs-common > Geometry > GeodeticTransformProps > targetEllipsoid targetEllipsoid targetEllipsoid: undefined | GeodeticEllipsoidProps The complete definition of the target geodetic ellipsoid referred to by ellipsoidId. The target ellipsoid identifier enables obtaining the shape of the Earth mathematical model for the purpose of performing the transformation. Defined in core/common/src/geometry/GeodeticDatum.ts Line 350 Last Updated: 12 June, 2024