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Aerial triangulation is extensively used to improve the density of 
existing geodetic triangulation networks in mountaineous areas. An 
instrumental aerial triangulation method has been developed bas 
wn methods. Block adjustment is executed by the method of least 
The computations are catried out either via the computer of 
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sguares. 
the Nuclear Center (Democritus) using a program prepared for this 
purpose or via desk caluulators. 
2. Tonographic and Ca stral Service of the Ministry of Public Works 
9 M DD WW) 
(0.0. S, M. P. W, ) 
pm————— SEE (— 
This Service is well equipped with all types of conventional surveying 
instruments such as theodolites, tacheometers, levels etc. for photogrammetric 
control surveys. oreover its photogrammetric branch possesses a gee 
collection of photogrammetric instruments and machines among which there are: 
— Zeiss Stereoplanigraphs C7 
Zeiss Jena Ster a an POL 
Wild Autographs A8, AT, & A6 
Zeiss ene Stecometers for analytical aeroiriangulátion 
pa 
Nistri Photomappers & & Kelsh plotter. These instruments 
are used mostly for the on the job training of ihe operators. 
A photocopy Camera 
-.À Zeiss SEC V rectifier 
In addition to the preceding instruments qT.C.S.M.P.W. possesses 
cameras and a good deal of auxiliary equipment for the better and easier 
execution of its work. 
An IBM 11/30 computer which has been installed at the Ministry of 
Public Works main offices serves for the solution of the pertiment photo- 
grammetric and/or geodetic problems of the T.C.S. M. P.W. 
This Service so far has compiled photog crammetrically maps at a scale 
of 1:20,000 covering over 25% of the total area of the country : which amounts 
to about 131,000 km . The main use of these maps is for feasibility studies 
and engineering works. Also large scale maps and diagrams have been compiled 
ome parts of Greece i.e, certain districts for the design of engineer- 
covering S 
ale of 1:5,000, and rural development studies for a number 
ing works Rs a sca 
of towns and villages at scales of 1:1000 and 1:500.