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3 EXPERIMENTS 
The experiments on the production of orthophotos were carried out 
not only with the wide-angle photograph but also with wuper-wide 
angle photographs. 
Experiment A: 
Photographic Area: Guang Dong, China 
Photograph: Super-wide angle, scale - 1:36000 
Product: Map scale - 1:10000; Contour well registered. 
Experiment B: 
Area: Switzerland 
Photograph: Wide angle, scale ~ 1:5000, MSE of point position -- 
O.4mm.