At present, with the development of the affection in different layouts and decision-makings of
orthophotomap in various fields, the information quantity of digital orthophoto map reflects and
decides the affection of decision- makings on deep degrees, and it affects the dependability of
analytical result, thereby, to perfect the outputs of digital orthophoto map is a problem that should be
solved as soon as possible . The paper summarizes the current status of the digital orthophoto map,
introduces the backdrop, and analyses the main question in the development of digital orthophoto
map.The paper analyses three contents of information entropy: Shannon-Wiener entropy, Markov
information entropy and Co-occurrence Matrix entropy. Through the experiments we find out that
using Markov information entropy to account the information quantity of orthophoto character on the
digital orthophoto map is the best one. The map load is very important for the map. The paper analyses
the complexity and particularity of the digital orthophoto map laod through the introduction of map
load of general map. It studies on map load based on information and probability,and puts up a test to
try to express the map load of remote sensing orthophoto quantitatively.
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