https://ctech.com/studio_help/file-format-details/consistent-coordinate-systems/index.htmlConsistent Coordinate Systems C Tech’s software is designed to work with many types of data. However, because you are creating objects in a three-dimensional domain (x, y, and z extents) you must have all objects defined in a consistent coordinate system. Any coordinate projection may be used, but it is essential that all of your data files (including world files to georeference images) be in the same coordinate system.Hugoen-us