PREFACE 
Compania Mexicana Aerofoto, S. A., authorized by the Department of Agrarian Affairs 
and Colonization (1), has been taking part in surveying and locating large tracts of land 
in the Mexican Republic, which, through legal provision, should come under the control of the 
nation in order to satisfy agrarian needs. 
Th carrying out of the afore-mentioned task has required studies, through different 
methods, of two million square kilometers which is the total area of the Mexican Republic. 
The Agrarian Department considered convenient to seek help trom private companies to 
develop this research; (2) among these, Compania Mexicana Aerofoto, S. A., has been 
playing a special role, considering that it has surveyed 65% of the area covered up until 
now. 
It is believed to be of general interest to present a resume of the works that were 
carried out, on land location, to the delegates of the International Society of Photogram- 
metry in their meeting at Lausanne; as they were presented in the last annual meeting 
of the ACSM and ASP last March, at Washington, D. C. U.S.A,, where the technicians from 
different countries discussed their experiencies on the matter, setting the bases for future 
similar projects. 
One should therefore consider this publication as the specific contribution of the Compañia 
Mexicana Aeroofto, S. A., and in no way should it be considered as the official report 
of the Mexican Government. 
  
(1) The Department of Agrarian Affairs and Colonization is the Mexican Government body, 
authorized by the law for the management of all matters related to land tenure. 
(2) The possibility of participation by some foreing companies was analyzed, but as will 
be explained below, it was considered to be unnecessary.