-7- 
A separate (smaller scale) photographic coverage is used for the determin- 
ation of minor control (in order to save ground control and A.T. work). 
The larger scale photographic coverage (determined by the need for semantic 
information) is used for plotting. 
  
  
e) [AERIAL PHOTOGRAPHY] | GROUND CONTROL] 
  
  
  
Y 
>| MINOR CONTROL 
DETERMINATION 
  
  
  
  
  
  
  
  
  
  
  
  
  
TOPOGRAPHIC ^ PRODUCTION OF 
o ground control. PHOTO INTERPRETATION ORTHOPHOTOS |. 
& DROP LINES 
  
  
  
i much wider 
  
1 
TRANSFER OF INTERPRETATION 
RESULTS TO PHOTOMAP 
' 
Pig. 6 
  
  
  
  
‘A procedure applicable to the production of annotated photo maps. Topographic 
photo interpretation of the orginal aerial photographs is applied because 
of the loss of semantic information and the difficulty of stereoscopic 
observations of the orthophoto maps. 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
f) AERIAL PHOTOGRAPHY AERIAL PHOTOGRAPHY | GROUND CONTROL | 
AT LARGER SCALE AT SMALL SCALE 
. 4 1 1 
are consider- MINOR CONTROL 
e.g. s 
TOPOGRAPHIC PRODUCTION OF 
iy PHOTO INTERPRETATION "| ORTHOPHOTOS 
'ONTROL | & DROP LINES 
  
  
  
  
  
1 $ 
TRANSFER OF INTERPRETATION 
RESULTS TO PHOTOMAP 
; 
Fig. 
  
  
  
  
A more consequent application of the principle applied in the foregoing 
procedure: Small scale photography is nsed for A.T- and orthophoto