API Reference > imodeljs-common > Geometry > ProjectionProps > standardParallel standardParallel standardParallel: undefined | number Standard parallel for projection that only use one. For cylindrical projections (mercator, transverse mercator ...) it defines the parallel at which the cylinder crosses the ellipsoid resulting in a scale factor being applied. For conic projections (Lambert Tangential ...) it defines the standard parallel at which the cone is tangent to the ellipsoid. Defined in core/common/src/geometry/Projection.ts Line 196 Last Updated: 11 June, 2024