— 
A pa 
  
10. 
10.1. 
11. 
11.1. 
12. 
Influence of scale, in the case of small scale maps, on new photogrammetric methods (B.1/Panel 4) 
The drafting error is preponderant in maps at scales 1:100 000 or 1:200 000. In large classes of 
photogrammetric surveys of this type it is useless, consequently, to pay much attention to the 
horizontal accuracy. This means that one can save the costs of terrestrial or aerial triangulation 
and use less expensive, airborne means of orientation. A discussion of these means, and of the 
circumstances limiting their application (especially with regard to vertical accuracy), should 
provide the countries lacking both triangulations and maps with economically important infor- 
mations. 
The marking of controls and boundary points as a tool of high precision photogrammetry 
(B.1/Panel 5) 
High precision photogrammetry requires the possibility of making certain ground points visible 
on photographs by field marking. The means securing satisfactory results in this respect are 
dictated much more by the needs of economy and organization than by purely photogrammetric 
considerations. An exchange of information about practical and successful marking devices should 
be beneficial to the production of coordinates and maps. The supervised tests have shown that 
unacceptable coarse errors in plotting happen in spite of careful marking and identification of 
points. It is hoped that the discussions might reveal some means for avoiding such errors. 
Each panel should record its main conclusions as short theses and resolutions. Otherwise the 
results of the discussions of Commission IV might well volatilize, instead of becoming the basis 
for further work and development. 
Berne, August 4, 1960 
The President of Commission IV/ISP: 
Härry 
  
  
1.1. 
1.2. 
1.3. 
1.4. 
1.5. 
1.6. 
1.7. 
1.1