19 - 
measure then! first. The analytical plotter may be the best tool 
to do this. On the other hand it may be feasible to include 80 % 
longitudinal or 60 % lateral overLap more efficiently in aerial 
triangulation. This sofar has been prohibitive due to the measuring 
effort. It may in turn help to reduce systematic errors significantly and 
to provide the wanted redundancy of point determination which is 
lacking in standard photogrammetric measurements, but which is requested 
by some users, for example in cadastral surveys. 
' t 
The increase of efficiency comes about through the possibility of 
automatic point slewing to its approximate position avoiding a search, 
but also through semiautomatic point transfer made possible with 
the AP/C. 
While points are selected and recorded in the first model, they 
are reset by second photo photocoordinates in the second model, 
if they fall within the photo-limits of the model. 
After relative orientation of the second model and stereoscopic 
removal of x and y-parallaxes the third photo-photocoordinates are 
recorded for the transferred points. New points are selected and 
ili.'i- 1 ■ ; ■ ■ ' *} t ■ • . 
stereoscopically measured for transfer to the third model. 
t . ' ' • , 
v 
The procedure repeats itself along the strip. 
For the cross strip transfer adjacent photos overlapping by 
20 % are oriented as well. In this way the transfer points from 
£"• i * ' 1 • \ • ' , • ■ i ’ • ' ' . ’ 
the old strip are transferred to the new strip. 
i • ■ > • i 
The transfer for the newstrip proceeds as before, with the old 
f • • : 4 - i ^ , ; • . • , ; . t ■ ' y ’ \ 
points set by previously established photo-coordinates. ,