Forest stem volume retrieval with VHF-band SAR

Details Forest stem volume retrieval with VHF-band SAR Forest stem volume retrieval with VHF-band SAR

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.475...13s&link_type=abstract

In: Proceedings of the Third International Symposium on Retrieval of Bio- and Geophysical Parameters from SAR Data for Land Appl

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4

Forests

Scientific paper

Forest stem volume is an important parameter to retrieve using remote sensing; for global biomass studies as well as local forestry planning. In this paper, we use a polarimetric scattering model to discuss the possibilities of using low frequency SAR to retrieve stem volume. The benefits of using low frequencies (low attenuation, Rayleigh scattering and low sensitivity to terrain slopes) are presented, and we discuss some of the problems restricting the accuracy of stem volume retrieval, related to attenuation by the forest canopy, and the dependence of the backscatter on the ground properties due to the dominance of the dihedral trunk-ground scattering. For the essentially HH-polarised backscatter measured by the CARABAS airborne SAR system, terrain slopes are a major disturbing factor on the accuracy of stem volume retrieval, and we present results of using images from different flight directions to compensate for this effect.

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