Deriving Forest Canopy Height Models using multi-beam TerraSAR-X Imagery

Conference: EUSAR 2010 - 8th European Conference on Synthetic Aperture Radar
06/07/2010 - 06/10/2010 at Aachen, Germany

Proceedings: EUSAR 2010

Pages: 4Language: englishTyp: PDF

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Perko, Roland; Raggam, Hannes; Gutjahr, Karlheinz; Schardt, Mathias (Joanneum Research, Institute of Digital Image Processing, Austria)

The presented study focuses on the derivation and validation of digital surface models and digital forest canopy height models using multi-beam TerraSAR-X Spotlight data. The derivation of these elevation models is based on multi-image radargrammetry and the validation is based on a comparison to laser scanner DSM and DTM. It is shown that the resulting DSMs are very accurate (+/- 1 meter) on bare ground, while forest canopy heights are systematically underestimated. This bias is caused as the SAR signal in X-band penetrates into the forest canopy, where the penetration depth depends on the off-nadir look angle.