As the simple examination of photographs taken for the Large scale mapping some visual tests and simple criterions are adopted: that is, overlapping Oii-1, on Fig. 1, Connection angle αi R on Fig. 2, Rotation angle on βi on Fig. 3, and Deviation yi from the mean flight line and take statistical mean of these values and absolute values, which are defived as P1, P2by formula (1), P3, P4 by formula (2), P5, P6 by formula (3) and P7, P8by (4) . The Results are shown on Table I and II, and Conclusions are as follows; the standard overlap can be taken about 56%, the single eingised aeroplane is not favorable in our case, the number of photographs in one strip is desired to be less than 30.
