Photogrammetric surveys

The department of photogrammetry is responsible for the photogrammetric stereo-compilation at different scales. These surveys are executed on high performance photogrammetric stations.

Planicomp instrument	Digital station

Two kinds of survey are executed:

Surveys at medium scale

• Mainly intended for works of basic cartography at scale 1:50 000 and for supplying the topographic data base.
• Scale of photographs: 1:40 000° for the surveys at 1:25 000; 1:60 000° for the revision surveys of base map
  at 1:50 000° and 1:75 000 for the base survey at 1:50 000.

Surveys at large scale

The INCT execute the surveys on large scales for the institutions, national and foreigner research department:

• Surveys at 1:1 000 for the needs of cadastre, Sonelgaz;
• Surveys at 1:2 000 mainly for the habitation ministry ;
• Surveys at 1:5 000 irrigation, barrages roads projects ...