Älternofip ] 
Nei 
« « l | 
Alternative I 
X a NA 
\ 4 Vd 
A 5. In alternative II 
vas obtained with repeats 
the autograph. The optici 
y made, but when checking 
particularly at the comer 
chanic adjustments. 
Les were measured for si 
as possible to the ‘ms 
rdinates were obtained fi 
X y 
i nans 620.00 26008 
i nini 62012 5000 
m 62018 74 
1 this is fitted in an il 
oints (00° and 910°), em 
de and direction oi whith 
in mm in the grid. 
  
Te ; . 5 9) oO . : > N 'Te0- A , > . : s 
ternate models are rotated 200^ in the stereo-plotter, the following co- 
I ie for the six grid points are obtained for the inverted model. 
wi x y Point X y 
n 
i | 620.18 740.11 128 00 hh 380.20 740.24 
ir I | 4 69012 | 500.18 12% ur + eo. 100, 380.15 500.27 
Ne N ecl 620.06 260.18 Bern 380.04 260.20 
The result of the triangulation is shown as alt. II in fig. 20. 
The result of the test shows that the effect of the planimetrie deformation 
yecurring in every model on the shape and scale of the triangulation strip be- 
comes much more favourable if alternate pairs of photos are rotated 200° when 
inserted in the stereo-plotter. In this way conditions have been prepared for 
building up photogrammetric control nets with the aid of sparse geodetic sup- 
porting measurements which do not have co-ordinate connection (bases or poly- 
cons), Naturally, the same favourable effect of the rotation cannot be assumed 
in actual practice, since then accidental and systematic errors of varying magni- 
inde and direction will come in owing to defects of the photo material, difference 
i level of the ground, etc. and the ensuing lack in orientation of the different 
models. 
I this connection it is particularly interesting to examine the variation of 
sale and azimuth in different parts of the O-system for the two alternatives ex- 
amined above. Connection lines between the different models were used as bases, 
and the result is shown in fable 14. The test shows that the variations in scale 
and azimuth in different parts of the strip are very small for Alt. II and thus 
that there are favourable conditions in this case for building up isolated photo- 
gammetric point systems on the base of length and azimuth-determined distances. 
3044 Grid triangulation in autograph A6 (test year 1956) 
The following data apply for the triangulation. 
Grid: Wild 24 x 24 em 
Projector constant: c = 150 mm 
Base in grid: 80 mm 
Distance of connection points from the image centre: 110 mm 
Lin the instrument: 375 mm 
Number of control points: 2 
Number of models: 10. 
In the autograph A6 the constant deformation of every model is greater be- 
Quse of the mechanical transference (pantograph) from the model to the map. 
In this case the O-system was formed graphically but otherwise the same prin- 
tples were used as in the preceding case. The models were connected succes- 
sively on a plastic base whereupon the co-ordinates for all plotted grid points 
vere measured in the co-ordinatograph. 
The O-system was fitted numerically in the ideal grid net with the aid of two 
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