public bool ConvertTargetToSource( CoordPoint targetPoint, ref CoordPoint sourcePoint )
A method to convert a CoordPoint in the TargetCoordSys to a CoordPoint in the SourceCoordSys. Note that this only handles single transformations. In order to perform more complicated concatenations (such as a vertical and horizontal transform, or a transform that requires an intermediate) you must use ConcatenatedTransform and generate a PointTransformer.