ee lei 
  
  
  
  
  
  
  
  
EEE ES PER STE 
    
    
  
    
  
  
  
  
  
   
   
au 
Lei 
  
  
  
  
  
  
\ / L “. V" e 2 -— ws 
LN 
1 
* e e v^ v v v" P. 
1 han v v Hz v e A 
v . ^ 
PN 
—————— 
05 mm 
~ di 7 
  
01 mm 
Fig. 20. Planimetrie errors in a 10-model grid triangulation in A 5. In alternative II 
every other model has been rotated 200^ 
A systematic planimetric deformation of the model was obtained with repel 
reciprocal orientation and levelling of a grid model in the autograph. The optic 
adjustment (“Schiefe- und Breitenfehler") was carefully made, but when cieli 
the projectors with a grid, certain errors were found, particularly at the come 
of the image field, probably due to minor faulty mechanic adjustments. 
In the levelled grid model the machine co-ordinates were measured for si 
points, the positions of which correspond as closely as possible to the ‘us 
points” of a model triangulation. The following co-ordinates were obtained fi 
the O-model. 
Point X y Point X y 
00. Ls actes 380.04 260.20 Ole eee 620.06 2608 
QUO Lo. ces ere» 380.15 500.27 019 ....... e 620.12 501 
00! cassure je 380.20 740.24 01” + vivisien es uani 620.18 7A 
If ten models are transformed into a O-system and this is fitted in an ikl 
grid net of size 2,400 x 480 mm on the base of two points (00° and 910 i 
were obtained at the other grid points, the magnitude and direction dl viii 
are shown in fig. 20 (Alt. I). The errors are stated in mm in the grid. 
60 
  
  
     
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
   
  
  
   
   
   
  
       
If alte 
ordinates 
point 
Ww. 
jr 
i 
The re 
The re 
recurring 
comes m 
inserted 
building 
porting 1 
sons), Né 
in actual 
tude and 
of level 
models. 
In this 
scale and 
amined a 
and the | 
and azim 
that ther 
grammeti 
003.2. Gi 
The fo! 
Grid: Y 
Project 
Base ir 
Distant 
Lin tl 
Numbe 
Numbe 
In the 
(Quse of 
In this c 
ciples we 
sively on 
Were me: 
The 0-