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TOPOGRAPHIC MAP

In the early 1980s, the national institute of cartography and remote sensing launched a new program of a basic regular topographic cartography at a 1:50 000 scale. It replaces the old cartography which became obsolete.

The projection system conical lambert was abandoned for the UTM system and for a new installed cutting (geographic).

The photogrammetric restitution from an aerial photography at the scale 1:40 000 allows a detailed and precise surveys for a photography at the scale 1:25 000. It allows too a photographic cover mainly for the coastal area at the scale 1:25 000.


topographic map
Topographic map


The INCT publishes and commercializes a several series of basic topographic maps and derivatives at different scales.

Two scales are defined for the basic cartography: 1:50 000 for the north and 1:200 000 for the south. The actually limit of 1:50 000 is the parallel 34°.



The basic cartography

Topographic map at 1:50 000

  • Source: photogrammetric surveys resulting from the aerial photography at scales 1:40 000, 1:63000 or 1:75 000 (according to the density of details of the areas.
  • Projection: U.T.M (Universal Transverse Mercator)
  • Meridien origine : Greenwich
  • Ellipsoïde : Clarke 1880
  • Découpage : géographique 0° 15' en longitude et latitude
  • Edition des feuilles : 07 couleurs
  • Région couverte : Nord du paralléle 34°

Map at 1:50 000 old edition

Topographic map at 1:200 000

  • Source: completed or no completed photogrammetric surveys on the terrain
  • Projection : UTM
  • Ellipsoid: Clarke 1880
  • Zero meridian: Greenwich
  • Cutting : geographic 01° on longitude and latitude
  • Map sheet edition: 04 colours
  • Covered region: south of parallel 34°

Map at 1:200 000


NB: the cartographic cover of north at 1:200 000 is a derived cartography.


The cartogram of the cartography at scale 1:25 000 can be visualized here.


The derived cartography

Topographic map at 1:500 000

  • Source: generalized reduction of African maps at 1:200 000
  • Projection: lambert on small field
  • Ellipsoid: Clarke 1880
  • Zero meridian: Greenwich
  • Cutting: resulting from the international map world. Sheet map of 2° on latitude in 3°on longitude
  • Useful format: 34 x 57 cm ( varying according to the latitude)
  • Map sheet edition: 07 colours

Map of Algeria at 1:500 000


NB:/ the sheet map of ADRAR resulting from planimetric outline includes not the altitude. The sheet map of IN Guezzem is edited in black and white


International map of world at 1:1 000 000

  • Projection : conic lambert secant on small field by area of 4°
  • Ellipsoid: Hayford 1929
  • Zero meridian: Greenwich
  • Cutting: sheet map of 4° on latitude, 06° on 08°30’ on longitude (according to the sheet maps) in accordance with a specifications of international map of world (BONN 1962)
  • Sheet map edition: 07 to 10 colours.

Map of Algeria on 1:100 000


   Normal edition in 06 or 07 colours: this edition contains the same elements as the international edition except the hypsometric colour. The road mileage is indicated on red. In the Saharan area, the silted area are represented on yellow.
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