(89) 
NATIONAL REPORT ON THAILAND 
by 
Phya Salwidhan Nidhes. 
It is a great honor for me to be given an opportunity to report to you on 
the activities of work on photogrammetry in Thailand. My country has long 
been interested in photogrammetry, but no practical work was undertaken 
until the formation of the Aerial Mapping Organization of Thailand. This was 
organized in 1950. 
This organization has as its objective to produce maps for the require 
ments of various government agencies. It has charge of all mapping by means 
of aerial photography for industrial and economic development of the country 
as required by the various civil agencies as well as for defense departments. 
Commencing late in 1950, a contract was given to Hunting Aerosurveys 
Ltd. of England to fly and photograph an area of about 20.000 square kilo 
meters for turning out topographical maps on the scale of 1/50.000 and for 
railway location surveys of a new railway line on the scale of 1/5.000. We start 
ed this way because we started from scratch, having practically no equipment 
nor staff. 
In addition to the above-mentioned work, we have also undertaken to 
produce maps for education purposes, for electrification purposes, and for irri 
gation purposes. An area of approximately 2.000 square kilometers was photo 
graphed for forest inventory purposes and an area of about 6.200 square kilo 
meters for hydroelectric power supply and construction of a reservoir. All of 
this is being done while we are procuring equipment from America, some from 
England, and some from Switzerland. This is coming in, but is not yet being 
put up. But we hope that within the very near future we shall be able to un 
dertake some of the plotting within our country, and eventually the aerial 
photography is to be undertaken by our own staff. But we are starting from 
scratch, and what we have accomplished so far has been without a lot of ex 
perience which we shall have to obtain. The country is not quite the same as 
what one usually finds in this country. Some parts of the country itself are 
very difficult, quite forest covered. And there is a lot to be learned even by 
the firms that have been given the contract for one of the projects already 
undertaken. 
I beg to thank you for this opportunity to report to you on the activities 
in photogrammetry undertaken for my country. 
RAPPORT NATIONAL THAÏLANDAIS 
par 
Phya Salwidhan Nidhes. 
Ce m’est un grand honneur qu’avoir l’occasion de vous faire un rapport 
sur les activités photogrammétriques en Thaïlande. Mon pays s’est intéressé