to Jidda, which will provide rail transport across the entire Arabian peninsula, 
will be based upon photogrammetry. 
The Jordan part of the Jordan River valley is being photographed as a 
preliminary to irrigation development. 
Point 4, under contracts with a Brazilian firm, is compiling a topographic 
map as a base for a geologic map of the mineralized area around Bello Hori 
zonte, one of the richest in the Western Hemisphere. Photogrammetry is 
making possible the development of this region in a fraction of the time that 
would be required by old methods. 
In Costa Rica, a small aerial photographic survey is the first step toward 
the development of the Tempisque River valley. 
I think you are familiar with the fact that we have been helping the Boli 
vian Government through technical advice and training to carry out aerial 
photography themselves. 
We have a number of other projects under consideration which will also 
involve photogrammetry, to be performed under contract, as is our practice. 
There have been many, many instances in which we have used existing aerial 
photographic surveys for planning development work. One was that of Ethi 
opia, where United States trimetrogon photographs taken during World War 
II were used in a preliminary survey of the Lake Tana-Blue Mile area. 
Vast regions of the world have hardly been explored. They have not been 
mapped, no census has ever been taken, their soils have not been classified, their 
rivers have not been bridged, their forests have not been cut through with 
roads. 
As I believe Professor James once said, a man traveling into country like 
this without an adequate map is like an ant on a Persian rug. He sees no 
pattern, he does not know what lies beyond his immediate range of vision. 
Economic development in an area without maps can work only at pro 
blems which are obvious and at opportunities close at hand. Sooner or later 
there must be maps, maps upon which all kinds of data can be plotted, maps 
from which all types of development may be planned. 
I have mentioned the matter of census several times. This is highly impor 
tant. In many regions of Liberia there has never been a census. When there 
are outbreaks of smallpox, or when a malaria-control campaign is being carried 
out, when you are planning roads, or planning where to send the few teachers 
you have at your disposal — it becomes very important to know where the 
people are and how many there are. Local officials did not know. But with 
aerial photographs one could count villages, even count houses. With a pretty 
good idea of how many people there are to a house, a man could make a census 
in a matter of hours that had never been made before in history — and the 
figures turned out to be pretty accurate. 
I have heard William Pryor in the Bureau of Public Roads say that aerial 
photography enabled them to save $ 700,000 in one 20-mile stretch of the Pan 
American Highway by locating a new route which saved a substantial amount 
of bridging and excavation. 
It is fortunate indeed that the world has a tool such as photogrammetry 
at its disposal at this particular period in history. Vast regions of the world 
are just beginning to realize their full potential for development, about to 
emerge from centuries of neglected progress. Their people are trying to do in 
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