- Dataset Availability
- 2009-01-01T00:00:00Z–2021-01-01T00:00:00Z
- Dataset Provider
- IGN
- Earth Engine Snippet
-
ee.ImageCollection("IGN/RGE_ALTI/1M/2_0") - Tags
Description
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.
Bands
Resolution
1 meter
Bands
| Name | Units | Min | Max | Description |
|---|---|---|---|---|
MNT |
m | -40* | 4810* | Terrain elevation in meters. |
SRC |
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. |
Terms of Use
Terms of Use
Citations
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);