The main points of the new method are: the digital map 
can be produced from aerial films directly; EPSA 
identificating and mapping in the field work; editting, 
updating and lettering in real time. It ensure the 
perfectness and correctness of maps. After approciate 
editting and modifying in office work,the maps can be 
plotted on paper,or transferred to GIS,or input to 
mapbase. 
The key point is that it must be provided with a mature, 
perfect and practical software — EPSA. 
This new method is available for large scale 
photogrammetric mapping,and is also available for 
small scale photogrammetric mapping,.Only the three 
modules listed as follow should be installed: 
Module of projective coordinate system 
transformation; 
Module of small scale symbol system; 
Module of pattern wandering function. 
Then the small scale map can be identified by EPSA. It 
can be mapped directly and the procedure of film 
idendificaion is not needed. 
The new method has been improved obviously in many 
aspect, such as: operating convienietly, raising accuracy 
of maps, efficiency in mapping and drawing. 
This method is now utilized in practical applications. 
410 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B2. Vienna 1996 
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