In exceptional cases there might be a need to georeference a vector map, which has been digitized in an unknown or undefined projection, or without any projection references at all, for example, maps, which have been created in a graphics program, very often also maps drawn in AutoCAD (see also for the procedure to import GIS data from AutoCAD). These maps can be georeferenced in a crude way in UTM with following procedure. Only a linear rectification can be performed. Therefore, the best results will be if the source map is in TM, UTM or similar projection (War Office is ok, latitude / longitude is not ok) and covers only a small area (max. 10 km). 2. Load the map (with its ‘wrong’ projection) into Map Maker and measure the distance on the map, as displayed in Map Maker with the 3. Load a map with correct georeference (GPS-tracked, georeferenced photo or similar) and measure the true distance on ground. 4. Divide the figure of step 2 by the figure of step 3. This will give the multiplication factor. If it is >, 0, the map will be enlarged, if it is <, 0, it will be reduced. 9. Calculate the difference both for x and for y (the distance to shift). Consider carefully, if it is a positive or negative shift. 12. Check for the 2nd ground control point. If the map was in the correct north orientation, the point of the map matches the location on the ground. In this case, the procedure is completed. Otherwise, the map has to be rotated: 14. Read the angle to the ‘false’ 2. GCP by drawing a line (dragging the mouse) from the 1. GCP to the 2.GPC, as shown on the map (‘false’ 2. GCP) and read the angle 16. Calculate the difference between the values of step 14 and step 15. Consider carefully, if it should be a clockwise rotation (positive) or anticlockwise (negative). 18. Load the map and check the two ground control points. They should fit to the predefined locations. If not, repeat the steps before. Note 1: If majority of the map is ok, but only a part of it appears wrong, you might have to consider the tool of vector rubber sheet ( to be georeferenced, you can choose a faster approach by processing steps 7-11 above and then stretch it in the live layer: Source.