dataset · Europe
RGE ALTI: IGN RGE ALTI Digital Elevation 1m
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 acc
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Licence: etalab-2.0
Evidence quality: 37.7
Listed in gee public catalogue API on 2026-10-16; relevance/value screened (haiku).
Metadata checked: 2026-10-14T13:20:00.000Z
What's in it
- Data offered docs-verified
- DEM 1m terrain elevation (MNT band) · elevation data source (SRC band) · distance to nearest point used for altitude calculation (DST band)
- Coverage docs-verified
- Metropolitan France · 2009-01-01T00:00:00Z to 2021-01-01T00:00:00Z
- Resolution docs-verified
- 1 m pixel size (all bands)
- Formats docs-verified
- Google Earth Engine ImageCollection
- Access docs-verified
- Google Earth Engine account required (free for research, education and nonprofit use); data terms etalab-2.0 licence
Useful for
- Use cases llm-inferred
- Flood-risk overland flow path and ponding analysis on 1m DEM for French sites · Drainage strategy catchment delineation for French project areas · Earthworks cut/fill and slope baseline from 1m terrain for French civils projects
- Audience llm-inferred
- flood consultants · drainage engineers · civils engineers · hydrologists · GIS analysts
Limitations
- Constraints docs-verified
- Coverage is metropolitan France only; not applicable to UK sites · Vertical accuracy is roughly 7 m on steep slopes · Wooded areas in correlation zones are filled with older 1987-2001 altimetry data (0.5-0.7 m accuracy) · Time span ends 2021-01-01, so the elevation model is not current · Requires Earth Engine access and registration
Evidence
- ee.ImageCollection('IGN/RGE_ALTI/1M/2_0')
- https://developers.google.com/earth-engine/datasets/catalog/IGN_RGE_ALTI_1M_2_0
Check upstream coverage, uncertainty and licence before use. Station observations are not forecasts or design levels.