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These coordinates are used for the compilation of a base map from rectified photographs 
in a scale 1 : 12.500. From this topographical maps 1 : 25.000, 1 : 50.000 and 1 : 100.000 
and in addition a technical map 1 : 10.000 are derived. 
III. 7. Aerial triangulation in the Cadastral Service 
Although this service only carried out surveys of blocks, the triangulation is treated in 
strips using the stereoplanigraph C 8 with numerical orientation. The photographs in the 
scale 1 : 10.000 are taken with the following cameras: Wild RC 7: 35 strips total 105 km 
with an average of 5 pairs per strip; Zeiss twin camera 60 strips total length 300 km, as 
an average 5 pairs per strip. 
Ground control points are available at each 3rd pair, which means 1 set of points in 
the beginning, in the middle and at the end of each strip. These points are signalized with 
discs of 30 cm. For the absolute orientation it is assumed that the terrain is horizontal. 
The triangulations are carried out once for each strip. The machine coordinates for each 
strip are corrected by means of a second order curve. The coordinates determined in this 
way have an accuracy of about 15 cm, which represents a mean square error of 15 microns 
in the plane of the negative, which, without any doubt is remarkably good. This is probably 
also due to the short interval of ground control. Since only one pair is really bridged, 
there will be in general very few cases, in which aerial triangulation with so much ground 
control is really justified from the economic point of view. 
CHAPTER IV. THE APPLICATION OF PHOTOGRAMMETRY TO 
THE SURVEY OF THE EARTH SURFACE 
We will deal in this chapter separately with the subject of each of the subcommissions 
in order to facilitate the comparison of this national report with the various reports of 
Commission IV. 
Subcommission IV/1. Production of large scale maps and cadastral surveys 
The services dealing in this country with large scale photogrammetric map production 
are: 
a. Cadastral Service. 
b. Survey Department of the Ministry of Transport and Waterstaat. 
c. K.L.M. Aerocarto. 
IV/1.a. Cadastral Service 
The surveys for reallotment (landconsolidation) and resurvey of old cadastral maps is 
exclusively executed by the Bureau of the Cadaster, which has since 1955 had a special 
Department for Photogrammetry. The Wild RC 7 camera was used until 1958, later the 
Zeiss Twin camera. 
  
  
TABLE 5 
Scale of Scale of Scale of Signal 
negatives (S,) model (S,,) map (S,) dimension cm 
+ 1 : 10.000 ] : 4.000, 1 : 5.000 ].:.2.000 30 x 30 
+ 1: 5.000 1 : 2,000, 1 : 2,500 1 : 1.000 15x 15 
  
  
  
  
  
  
21