The next group is termed derived maps. Like primary maps, they are facts, however these descriptors are difficult to collect and encode, so the computer is used to derive them.
NIMA produced 78 imagery-derived maps covering a total of 13 million acres. These maps not only helped the Indonesian authorities, but also the U.S. military reserve units deployed to the area to assist in fire suppression efforts.
The image-derived map has high classification accuracy for certain covertypes, but low classification accuracy for others.
This is often done for visual clarity in the creation of derived maps. Almost all GIS software provides the capability to easily dissolve boundaries based on the results of a reclassification.
 See also: Information, Map, Surface, Mapping, Geographic
  
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