This command presents a dialog to load a Picture World File. VSP uses the Picture World File to match locations on the map with points on the picture.
If the World file exists in the same folder as the background picture, VSP will automatically load the world file when you load the background picture. In such a case, this command is not needed. This command is only needed if the world file is not automatically loaded.
If more than one background picture has been loaded, only the first selected background image will be calibrated. See the Layer Control Bar for details on selecting background pictures.
As an example, load the background picture VSPEx2.jpg, then load the world file VSPEx2.jgw.