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The ALTI® EGR describes the normal shape and altitude of the soil surface on a large scale.

The ALTI® RGE is the complete rehabilitation of the "altimetry" theme of the topographic component of the large-scale repository (RGE®). A repair program was initiated in 2009; its objective is to build a digital field model (MNT) at a 1-meter pitch over the whole of France.

The accuracy of the MNT actually varies according to the areas and the stakes: it is increased to 20 centimeters EMQ in flood or coastal areas to meet the needs related to the implementation of the European flood directive.

Model wearing light green backpack with black canvas straps and front zipper pouch.

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