P2-1-5 
Figure 10 shows stereo image taken from moving car. 
Figure 10 Stereoimage 
6 CONCLUSION 
We have mentioned about the method of field investigations 
using digital image and GPS. Finally, problems of this method on 
use are follows. 
(1 ) The area that field surveyors can catch FM multi-channel 
wave is restricted. Also, positional precision of DGPS is 
reduced because of using FM multi-channel wave. 
( 2 ) When field surveyors input data on field, usual laptop 
computer is not convenience to use. 
( 3 ) Before field surveyors start field investigation, it is 
necessary to check that batteries are full. 
REFERENCES 
T.FUSE, E.SHIMIZU, S.MORICHI, 1988 
A STUDY ON GEOMETRIC CORRECTION OF HISTORICAL 
MAPS 
International Archives of Photogrammetry and Remote Sensing. 
Vol. XXXD, Part 5. Hakodate 1998