1• Classic methods for point transfer 
.1 
1.1 The most rigorous method for this purpose is to use 
signalized tie points. However costs for field crews 
are considerable. 
1.2 Another method uses natural points (stones, tufts of grass..) 
that can easily be identified on the photographs. Some 
manufacturers offer point transfer devices which permit 
to engrave a circular mark around around the selected 
points. 
1.3 In Cctse that no natural points can be found, artificial 
points must be marked by a mechanical device. 
1 •k Three-stage-comparator permit point transfer without 
mechanical dammage of the emulsion. However the price 
for such an instrument is likely to be higher than for 
an ordinary stereocomparator. 
1,5 In order to avoid the disadvantages of the different 
point transfer methods, Albertz, Kreiling, Wiesel 
developed a block adjustment program which is based 
on parallax measurements in overlapping photographs. 
Point transfer is no more necessary. 
2, Use of an analytical plotting instrument for point transfer 
2.1 Principle 
The conception of an analytical photogrammetrie instrument 
permits to store coordinates of transfer points in core 
№ mory of the control computer. When in course of strip 
measurements photo 1 will be replaced by photo 3 , the 
photo coordinates of tie points in photo 2 are still 
available. This permits to move the floating mark