API Reference > imodeljs-common > Geometry > AdditionalTransform AdditionalTransform Class Additional Transform implementation. An additional transform is a transformation that can apply to either the horizontal or vertical coordinates of a geographic CRS. The transformation is applied after the latitude/longitude have been reprojected thus the process is applied to the result Cartesian coordinates of the projection process. Implements AdditionalTransformProps Methods Name Description constructor(data?: AdditionalTransformProps): AdditionalTransform equals(other: AdditionalTransform): boolean Compares two additional transforms applying a minuscule tolerance to comparing numbers. toJSON(): AdditionalTransformProps Creates a JSON from the Additional Transform definition fromJSON(data: AdditionalTransformProps): AdditionalTransform Static Creates an Additional Transform from JSON representation. Properties Name Type Description helmert2DWithZOffset Readonly undefined | Helmert2DWithZOffset The properties of a 2D Helmert transform with Z offset if one is defined. Defined in core/common/src/geometry/AdditionalTransform.ts Line 102 Last Updated: 12 June, 2024