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THE APPLICATION OF PHOTOGRAMMETRY TO HIGHWAY AND RAILWAY DESIGN 
IN MEXICO DURING THE PERIOD 1972 - 1976 
  
by Mr Bulmaro Cabrera Ruiz 
Ministry of Public Works, Mexico. 
During the period 1972-1976, at the Ministry of Public Works in 
Mexico, we have been applying photogrammetry for highway and 
railway design, in route selection, preliminary design and de- 
tailed design. 
As the main portion of the new roads and railways now under const- + 
ruction in our country are located in areas with heavy vegetal : 
cover, the main volume of photogrammetric work corresponds, in 
the first place, to the production of stereoscopic models and 
maps at scale 1:5 000 in Balplex instruments, through aerial pho- 
tographs at scale 1:25 000 for routes studies, and secondly to 
map plotting at scales 1:2 000 and 1:1 000 from 1:10 000 and 
1:5 000 photos, respectively, for preliminary design. 
Photogrammetric cross-sectioning for detailed design has rated 
340 km per year, as a mean, during the last four years. 
In order to increase the accuracy of cross-sectioning, we have 
established, as a common practice, the use of compensation plates 
to correct radial distortion. By means of this procedure, the dif- 
ferences between earthwork volumes calculated by photogrammetric 
data, and those obtained directly in the field have been reduced 
to 2,5%, 
Finally, we have been placing special interest in the broadcasting + 
of photogrammetric procedures for highway and railway design in 
several professional organizations, and in many universities of 
Mexico. 
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