RGE ALTI: IGN RGE ALTI Digital Elevation 1m

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dem elevation geophysical


The RGE ALTI dataset describes the digital elevation model (DEM) of France with the pixel size of 1m. It was created from surveys obtained by airborne lidar or by correlation of aerial images.

Lidar was deployed for flood-prone, coastal, and large forest areas. The vertical accuracy of the DEM in these areas is between 0.2m and 0.5m. Radar was used in mountain areas (Alps, Pyrenees, Cevennes, Corsica). Caution: in areas with steep slopes, the average vertical accuracy is the order of 7m.

The accuracy of these fields has been checked against various sources: the road and hydrographic networks of the BD TOPO, geodetic terminals and points calculated on the ground.

Aerial photo correlation techniques are used in the rest of the territory. On certain zones treated by correlation, ground measurements are absent over large extents due to the presence of vegetation (wooded areas, for example). 1987-2001 altimetry data (BD Alti) are used to fill these gaps. The vertical accuracy of the DEM on these areas is between 0.5m and 0.7m.

Currently the collection includes a single image IGN/RGE_ALTI/1M/2_0/FXX showing metropolitan France.

This dataset was prepared and ingested with the support of Guillaume Attard and Julien Bardonnet (AGEOCE). The preparation process is described here.

See also: user's guide.


1 meter


Name Units Min Max Description
MNT m -40* 4810*

Terrain elevation in meters.


The main source of the data used to calculate the altitude of the node. See Appendix B page 26 in the user guide.

DST m 0 255

The distance in meters between the node and the nearest point used to calculate its altitude.

* estimated min or max value

Terms of Use

Terms of Use



  • IGN (2021). RGE ALTI 1m [Data set]. Accessed 2022-07-01 from IGN website

Explore with Earth Engine

Code Editor (JavaScript)

var dataset = ee.Image('IGN/RGE_ALTI/1M/2_0/FXX');
var elevation = dataset.select('MNT');

var elevationVis = {
  min: 0,
  max: 1000,
  palette: ['006600', '002200', 'fff700', 'ab7634', 'c4d0ff', 'ffffff']

Map.addLayer(elevation, elevationVis, 'Elevation');
Map.setCenter(3, 47, 5);
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