tions special Funds for executing a four years project for eO 
strenghening the survey Department Topographical Division. 
The existing 1:25 000 reconnaissance maps have no proper to- 
pography and in addition the limited 1:100 000 map coverage 
around Khartoum is very poor for the study or planning of 
development projects Developing the professional capability 
to produce a multipurpose 1:100 000 map series on a regular 
and accurate basis through the improvement of technical and 
metodological procedures, has been the main objective of the 
UNDP project which decided to extend the photogrammetric ac- 
tivities until June 1976. 
Tor the aerial survey in 1975 the old Dakota Air Craff 
was repleced by the Twin Otter Plane from Canada. The com- 
puterized Block Adjustment using the Elliott 803 Khartoum eo 
University introduced in 1971 has vastly improved the speed 
of obtaining Photogrammetrio coordinates vhich had previo- 
 n8ly been determined from Zarzyoki's Graphical Adjustment 
Method. Map Compilation has been introduced using Wild A 10 
autograph for the independent Model triangulation and Wild 
TS 
ile 
instrument for plotting. 
The Photogrammetric section has become more organized 
and its primary work has been the compilation of the 1:100 000 
national mapping series for Sudan which 1s covered by 920 
sheets, each 30° square at this scale. The mapping priori- 
ties have been governed by the trigonommetric network's 
existence, the availability of suitable photocoverage, and o 
various departments requests. 
Thailand /Gen. Phayon Phumhiran/ 
The progress of photogrammetry during the 1971-1975 pe- 
riod in the field of aerial mapping vas performed at the 
Royal Thai Survey Department and other Governmental Units. 
At the Survey Department the aerial mapping projects was 
conducted for 1:25 000 scale topographic maps, totalling 
129 sheets and for 1:20 000 and 1:12 500 scale city map, 
totalling 21 sheets. For several projects the other Units 
carried out 959 sheets of photo-maps at the scale 1:4000 
and topographic maps at the scale 1:10 000 as well as ot- 
her photogrammetric measurements using over 400 models and | 
more than 200 rectified photos. o 
18 
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