RGE ALTI 2015 is a gridded numerical terrain model describing the shape and elevation of the French terrain. It is produced by the Bureau de Recherches Géologiques et Minières and was last updated in March 2019. The model is designed for use at scales between 1:3,000 and 1:20,000 and is available in 1-meter and 5-meter grid resolutions.
Use Cases
- Generate topographic maps and 3D visualizations based on the gridded elevation data.
- Perform hydrological modeling for flood risk analysis based on the terrain surface representation.
- Calculate slope and aspect for land-use planning or agricultural studies based on the elevation grid.
- Create elevation profiles for infrastructure planning based on the 1m or 5m resolution data.
Strengths
- Designed for use at a specific scale range (1:3,000 to 1:20,000), indicating intended application precision.
- Offers two resolution options (1-meter and 5-meter grid steps) for different detail needs.
- Described as having better quality compared to a previous ALTI version 1.0.
Limitations
- Description metadata is limited; actual data quality requires manual inspection after download.
- Last updated 2019-03-27 00:00:00; freshness should be verified.
- The description notes it is an interpolated representation and 'not always strictly in line with reality'.
Provenance
- Source
- BUREAU DE RECHERCHES GÉOLOGIQUES ET MINIÈRES
- Collection Method
- Obtained through processes that ensure better quality compared to ALTI® version 1.0; likely involves aerial or satellite data interpolation.
- Freshness
- Last updated 2019-03-27 00:00:00
- Geography
- Gironde department, France