(53) 
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listère d’Agriculture et 
NATIONAL REPORT OF BELGIUM 
by 
L. Vander Ryt. 
The working-out of the new standard map of Belgium at 1 : 25.000 scale 
by aerophotogrammetric methods has taken place within the Institute Géogra 
phique Militaire during this period. Two essentially different methods are used 
depending on the character of the terrain. Upper and Mid-Belgium are survey 
ed by aerophotogrammetry, whereas Lower Belgium is mapped by ground 
methods. 
Moreover, the Institut Géographique Militaire has progressed rapidly on a 
1 : 50.000 scale map of the entire country. This work is to be completed in two 
years. This procedure today is made with the aid of recent photographic cover 
age and by using simplified plotting procedures. 
The Section of Topography and Photogrammetry of the Ministry of 
Public Works has pursued the production of maps of large areas at the scale oi 
1 : 5000. In 42 months, 53.000 hectares (13.600 acres) of land were plotted. It 
produced also the necessary plans for the study of public work projects in Bel 
gium. An effort was made to conform to a uniform scale of 1 : 1000 for these 
plans. It is only in exceptional cases that a scale of 1 : 5000 was chosen. The 
Section of Topography and Photogrammetry has completed the plans for the 
study of 300 kilometers of communication routes in 2 years. 
The Cadastral Administration made in 1950 a study of a cadastral plan of 
the community of Waterloo by means of aerophotogrammetry. The conclusi 
ons are not yet definite. Although the necessary accuracy seems to have been 
obtained, the solution is excepted to be too costly and of insufficient returns. 
Other tests are being studied. 
Concerning the plan of the work of the Cartographie Coloniale (Colonial 
Mapping), the creation of the Geographic Institute of the Belgium Congo is 
important — an organization charged with the compilation and publication of 
the map of the Belgium Congo and of Ruando-Urundi in conjunction with the 
necessary geodetic, topographic and cartographic work. During its existance, 
since the first of January in 1950, it completed 90.000 square kilometers of 
aerial photography, and plotted planimetry and topography 445 square kilo 
meters at large scale, 520 square kilometers of planimetric mapping at 1:100.000 
scale and made 33.000 square kilometers of mosaics. 
In the unit of Colonial Cartography, the Institut Géographique Militaire 
plotted for the Institut Cartographique Coloniale Belge a survey of 1500 sq.km, 
in the region of Bokwanga at a scale of 1 : 10.000. It made the photographs in 
four areas (7 months were used) for the standard coverage of 116.000 sq.km, at 
1 : 40.000 scale, and 6500 sq.km, at 1 : 20.000 at 1 : 10.000 in the region of 
Katanga. It prepared 22.000 sq.km, of uncontrolled mosaics, 45.000 sq.km, of 
controlled mosaics, and 8000 sq.km, of photoplans (annotated mosaics). The 
plotting of the photographs and the compilation of the map at 1 : 100.000 
scale for 2 degrees square in Sakele and Haute-Lomami was begun. The ground 
control was surveyed by the geographic and geologic services of a Special Com-