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Journal Articles Comptes Rendus Géoscience Year : 2005

Assessment of C-band SRTM DEM in a dense equatorial forest zone

Abstract

A Digital Elevation Model issued from the SRTM mission was assessed on a study area located in a dense equatorial forest setting in French Guiana. The SRTM DEM defined on a 90-m grid was compared to three check sources: (1) airborne laser altimeter data, (2) an accurate heliborne DEM, and (3) spot heights. The paper also includes a comparison with a radargrammetric RADARSAT DEM. The results show that the accuracy of the SRTM DEM is about 10 m (standard deviation of errors). For a given slope aspect, the absolute value and the standard deviation of elevation errors increase almost linearly with the slope value. The slope aspect has a major influence on the sign of the elevation error: elevations are underestimated for slope facing SRTM signal (foreslopes, northwest), and conversely in the opposite direction (backslopes, southeast). Maximum errors are observed along these two directions

Domains

Applied geology

Dates and versions

hal-00614828 , version 1 (16-08-2011)

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Bernard Bourgine, Nicolas Baghdadi. Assessment of C-band SRTM DEM in a dense equatorial forest zone. Comptes Rendus Géoscience, 2005, 14, pp.1225-1234. ⟨10.1016/j.crte.2005.06.006⟩. ⟨hal-00614828⟩

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