Section of an orthophotogram 
prepared by means of 
Gigas-Zeiss GZ 1 Orthoprojector 
Scale of orthophotogram: 1 : 5000 
Original scale of aerial photos: 1 : 12000 
Aerial camera: ZEISS RMK A 15/23 standard wide-angle camera 
Time required: for entire base map sheet consisting of two models: 
— 2 X 2 1 /: hours. 
A planimetric photogrammetric plot was superimposed on the upper part of 
section for a comparison of accuracy (German Base Map 5, Sheet 
Hennef West (Sieg) — Air photos 5209/97, 98, 99). 
Reproduction by courtesy of the Topographic Survey of Nordrhein-Westfalen 
(14/7/1964 - 1592). 
Aerial Dhotographs released by the President of the administrative district of Düsseldorf under 
No. 18/104 on November 21, 1963. 
Bibliothek 
Tech nit ?* H h schul a 
Picture plate for publication Ahrend, Brucklacher, Meier, Utz "The Gigas-Zeiss 
Orthoprojector" in "Bildmessung und Luftbildwesen" No. 3/1964.