API Reference > imodeljs-common > iModels > EcefLocationProps EcefLocationProps Interface Properties that position an iModel on the earth via ECEF (Earth Centered Earth Fixed) coordinates Implemented by EcefLocation Properties Name Type Description cartographicOrigin undefined | LatLongAndHeight Optional position on the earth used to establish the ECEF coordinates. orientation YawPitchRollProps The orientation of an iModel on the earth. origin XYZProps The Origin of an iModel on the earth in ECEF coordinates xVector undefined | XYZProps Optional X column vector used with EcefLocationProps.yVector to calculate potentially non-rigid transform if a projection is present. yVector undefined | XYZProps Optional Y column vector used with EcefLocationProps.xVector to calculate potentially non-rigid transform if a projection is present. Defined in core/common/src/IModel.ts Line 54 Last Updated: 29 November, 2022