most advantageous from the economic viewpoint, for the production of the 
orthophotomap since can be used photograms with scale 1/30.000 approxi- 
matively, which enable to cover large areas in a rather limited number. 
BIBLIOGRAPHY 
1) Amadesi E., Vianello G. et A., 1977 - Guide to a slope stability map. 
36th Photogrammetric Week, Stuttgart 1977; Regione Emilia-Romagna, Col- 
lana di Orientamenti geomorfologici ed agronomico-forestali, MB T6, Pi- 
tagora Editrice, Bologna. 
2) Blachut T.J., Van Wijk M.C., 1976 - Results of the International Or- 
thophoto Experiment 1972 - 1976. National Research Council of Canada, 
Photogrammetric Engineering, v. 42, n. 12, December 1976. 
3) Blachut T.J., 1976 - The stereo-orthophoto technique in cadastral and 
general mapping. National Research Council of Canada, Photogrammetric 
Engineering, v. 42, n. 12, December 1976. 
4) Marckwardt W., 1976 - The production of stereorthophoto with the Topo- 
cart-Orthophot C Instrument System. XIII Congress of ISP, II Commis- 
sion, Helsinky. 
April 1978.