Forest Biomass Estimation Using ALOS PALSAR Images in Challenging Natural Forest Area in Finland

Mika Karjalainen(1), Ulla Pyysalo(1) and Juha Hyyppä(1)

(1) Finnish Geodetic Institute, Geodeetinrinne 2, 02430 Masala, Finland


SAR images are feasible to estimate the forest biomass to some extent. Particularly, L and P bands have provided relatively good correlations with the SAR backscattering coefficient and stem volume. Moreover, polarimetric and interferometric capabilities of the SAR systems have increased the estimation accuracy. However, the biomass estimation is more challenging in the case of natural mixed forests developing free from the influence of humans. Additionally, in Finland, the natural forests are located in areas of intermediate relief, which complicates the biomass estimation. This paper shows some results of the forest biomass extraction using ALOS PALSAR Fine beam polarimetric and dual polarization images. High-density airborne laser scanning was used as reference data. The test area is located in southern Finland in Nuuksio National Park, which mainly consists of natural forest. Airborne laser scanning is the only available method to produce relatively accurate biomass estimates when the extent of the test area is considered.



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