Delorme 6 Manuel D’Utilisation

XMap User Guide 

298 

If your image covers relatively flat terrain 
and/or has some distortion, the easiest 

method for registering an image on a map 
is to find four matching points on the image 

and the map. These four matching points 
can be on or near the four corners of the 

image and base map (see example to the 
right). Selecting matching points ties the 

image you are registering to the map and 
warps it accordingly. The resulting map will 
be the most accurate in areas where the 

points were more closely matched.  
Note  If your image covers a large area, 

you may want to add some matching points 
in the center of the image and map. 

 

If your image is distorted or covers terrain 

with varied elevation, the best method for 
registering your image to the map is to 

have control points distributed evenly 
around the image and the map (see 

example to the right).  
Note  For this method, it is preferable, but 
not essential, for the points to be evenly 

spaced.