3D Forest Parameter Retrieval from TanDEM-X Interferometry

Forskningsprojekt, 2014

The research project will continue the investigation of TDM data for forestry applications which started in 2011. The forest variables of interest are mainly forest height, stem volume and above-ground biomass. TDM provides a direct elevation measurement of the upper part of the forest canopy. The technique is analogous to optical stereo but measures range difference between two separated radar antennas. The technique was pioneered by airborne systems in the 1990s and by the Shuttle Radar Topographic Mission (SRTM) during its 11-day mission in 2000. Our basic approach is to combine the TDM measurement with a high-resolution digital elevation model (DEM) of the ground which, after subtraction, generates a map of the forest canopy height. TDM data are also sensitive to forest structure, i.e. the vertical and horizontal distribution of scattering elements which affects both interferometric height and coherence.

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