Digital Elevation Models from Aerial and Satellite Stereo Imagery

ISTAR company has produced elevation data covering a total area of 1 million square kilometers since 1986. The data is derived from aerial photographs and SPOT satellite imagery using automatic correlation techniques. Products include digital elevation models, orthoimages, and extracted linear and area features.

Use Cases

• Generate contour lines from DEM data for topographic map production.
• Create orthoimages corrected for terrain distortion using elevation models.
• Extract linear features like roads or rivers from imagery via semi-automatic methods.
• Analyze land cover changes by integrating DEMs with classified land cover files.
• Model terrain for hydrological analysis using elevation data at 20m or 40m resolution.

Strengths

• Covers 1 million square kilometers of terrain data.
• Uses SPOT imagery with typical pixel resolutions of 20m (PA) and 40m (XS).
• Supports complex databases with capacities from 1 to 20 GB.

Limitations

• Specific row count, column names, and sample data are unavailable.
• The description is from a secondary catalogue, not the primary data source.
• Data freshness, specific geographic coverage, and update frequency are unknown.

Provenance

Source

ISTAR (Imagerie STereo Appliquee au Relief)

Collection Method

Derived from aerial photography and SPOT satellite imagery using automatic correlation techniques.

Time Range

Production activities reported since 1986.