5 
boundaries by field personnel assigned to interview property owners for a 
description of their holdings. 
The third phase, which was made possible by a loan to the Government of 
Chile by the Inter-American Development Bank, involved a broad resources inventory 
survey and study. This work was designed to provide basic investigations of 
geology and geomorphology, soils, forestry, hydrology, canal mapping, metrological 
and climatological information, and economic studies. Then the correlation of 
these data into an overall land use capability designation for each of the proper 
ties was established and integrated with the property inventory survey conducted in 
phase two. 
Phase four was initiated at the request of the Empressa Nacional de Petroles 
(ENAP - the government agency responsible for exploration for and production of 
petroleum) for the purpose of investigating subsurface structures in the Project 
area and to direct further ground investigations for possible petroleum resources 
there. 
An essential part of the entire program was the collaboration with Chilean 
personnel who performed substantial portions of the work. Existing maps, ground 
control and resource studies that had been conducted in times past were used. 
The work of existing Chilean agencies was not superceded in any way; rather, an 
effort was made to provide these agencies with new, urgently needed data that 
could be of immediate use to the country. 
Those were the major functions of the Proyecto Aerofotogrametrico - Chile. 
This report is designed to provide information concerning the work of the 
consortium of photogrammetrie engineering companies and a brief analysis of the 
methods and techniques used in this study. 
Figure 1 shows the position of Chile in the South American Continent and 
outlines the general area of the work of the Project. 
AERIAL PHOTOGRAPHY 
The Project's first step was to obtain aerial photographs of the assigned 
area, Figure 2. This was essential to the later steps of the program which