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  • The DTM is a homogeneous and regular point grid indicating the elevation of the ground level in order to make a model of its surface. The DTM is drawn up by interpolation (adaptable prediction) of raw altimetric data (contour lines, structure lines and spot heights).

  • The contour lines contain all lines which connect points which are situated on the same altitude, in a model which is used to represent the relief on a large scale.

  • The contour lines contain all the lines connecting points with the same elevation, in a model which is used for a cartographic representation of the relief.