57 = 
    
  
Photogrammetric Plotting Instruments. 
Ad 4.13 
Case c) is used most frequently. 
Second variant is used for accuracy 
check of the 3dimensional photogram- 
metric net construction on universal 
photogrammetric instruments by means 
of the CNIIGAiK dummies. They consist 
of two basic and two supplementary 
plates, by a special conjuction of 
which it is possible to construct ba- 
sic photogrammetric net of whatever 
length. The dummy points coordinates 
are computed for Hican = 000m, ) 
£,,=100mm. Different values of tilt 
are supposed e - 30? - « 25? 
&“ + 20 = = 30? 
= 0, B,-10- +5m. The values of grou 
point heights vary in relation to the 
mean plane from -400m to +400m on the 
basic plates and from -1000m to -*7001 
on the supplementary plates. Maximal 
mutuous angles of tilt Ad = 55’ and 
Aw = 50°, 
When using this method it is possible 
to find influence of those errors, Ivory 
which are compensated when using geo- 
detical orientation of a single model 
Analogue instruments, used for AT mus 
have following parameters: 
a) in grid measurements min.altimetri 
errors 1:10 000 of the height of 
flight (m, :H) and planimetric erm 
(mean square) max. O,O02mm at the | 
: Rhodes 
image scale, 
b) when using Oschurkov dummies rela 
ve altimetric error min.l:5 000 
(m,:H), mean square error in plan