Comisión Constructora e Ingeniería Sanitaria, 
Secretaría de Salubridad y Asistencia. 
U.N.A.M. Instituto de Geografía, Universidad Nacional 
Autónoma de México. 
Private Companies. 
AEROCARTO Aerocartografia de México,S.A. 
AFGSA Aerofotogrametria, S.A. 
C.M.A. Compañia Mexibatin Aerofoto, S.A. 
FOTOCA Foto Cartográfica Catastral, S.A. 
FOTOINTER Fotogramétrica Internacional, S.A. 
CHAPTER I 
AERIAL PHOTOGRAPHY 
Eight metric cameras were bought in the period reported. The 23 x 23 
cm format and 153 mm focal lenght was the most usual. 
It was reported only one super wide angle camera but there is increasing 
interest for these type of lenses. 
Two organizations are trying sets of four 70 mm format cameras for - - 
photointerpretation purposes, using multispectral imagery. 
The use of color photography has increased mainly in photointerpretation 
in scales of 1:25 000 or larger. 
Considering the rather elevated terrain of the country, nine of the twenty 
aircrafts in use are Riley Rocket (Cessna 310 modified to have ceiling of 
the order of 10 000 meters). The number of photographic planes were - 
almost doubled in this period. There are as many planes in private com - 
panies as in gobernmental organizations. 
Continuous processing machines for black and white or color, are in use 
at the bigger organizations.