digital map data to be revised 1:2,500 scale digital map data 
m scale of aerial photograph 1:12,500 
digital map, scanning pitch 11.5 um x 13.5 um 
ire special accuracy of roads 0.57 m (52) 
but common accuracy of buildings 1.23 m (28) 
m Td anyone rate of omission for building revision | 7 96 
) m OU scale - planimetric accuracy of the revision by simple updating method 
eloped by GSI assuming revison results by stereo plotter true 
to be adopted - figures in parenthesis are numbers of points where differences are measured 
p 
rom this year. 
cale mapping 
systems show 
interpretation 
otograph such 
fficult unless 
igh resolution. 
Table 1 Specification of data used for experiment and the accuracy of simple updating method 
  
hinari, and B. 
ed  1/25,000 
International 
and Remote 
22. 
  
  
  
  
solid lines: revision by simple updating system 
broken lines : revision by stereo plotter 
Figure 4 : Example of 1:2,500 scale digital map revised by simple updating system 
411