ES 
(398) 
Tilt determination by use of neighbouring photographs. 
This method is free of fixed points. The inquired elements of tilt can be 
determined much more accurately by measuring of distance parallaxes. 
  
  
da zZ 4 
Hy 
I 
A 
2 
& 
  
  
  
  
  
  
  
Fig. 3 
In order to get simple 
relations the distances 
should be chosen as fol- 
lows: 
1) The perpendiculars 1’ 
and u' in 
Hz to HiH?. 
The size shall be ap- 
proximately equal to 
Hi'H* — s. 
2) The distance d' and t’ 
starting from H^; and 
pointing towards the ends of the perpendiculars 1” and vu”. 
Measuring the distance parallaxes Ad’, At), AT 
tilt of the second photograph are resulting as follows: 
Au Ad 
uut 
S 450m eur iod dus 
r NT Rr 
/ / t 
ez 
Hereby the principal bearing o' relates to the line H» 
dy er- yu - 
and Au’, the elements of 
Ad? 
5) 
‘Hy’. 
SOME NEW GEOMETRIC KNOWLEDGE ON VERTICAL 
PHOTOGRAPHS 
by 
Dr. Ing. Josef Sutor, Miinchen, Germany. 
The distortion of a vertical photograph is chiefly marked by two elements, 
distortions of direction and of distance. In addition to that the deduced 
distortions of angle and plain are im- 
complicated 
  
  
ner. 
portant. All these distortions can be 
expressed by formulas which are too 
for practice. Only- by 
restricting to small nadir distances 
and by introducing of useful para- 
meters expressions can be developped 
» which are fit and can be geometrically 
x interpreted in the most simple man- 
Fig. 1 We suppose that the origin of