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Stem volume estimation for boreal forest using ALOS PALSAR

Leif E.B. Eriksson (Institutionen för radio- och rymdvetenskap, Radarfjärranalys) ; M. Magnusson ; J.E.S. Fransson ; Gustaf Sandberg (Institutionen för radio- och rymdvetenskap, Radarfjärranalys) ; Lars M. H. Ulander (Institutionen för radio- och rymdvetenskap, Radarfjärranalys)
5th International Symposium on Retrieval of Bio- and Geophysical Parameters from SAR Data for Land Applications, Bari, Italy, September 25-28, 2007, ESA, Istituto di Studi sui Sistemi Intelligenti per l´Automazione p. CD. (2007)
[Konferensbidrag, övrigt]

An evaluation of ALOS PALSAR data for standwise forest stem volume estimation has been performed at a Swedish test site. The site is dominated by coniferous tree species. SAR data from three operational PALSAR modes, including single, dual and quad polarization, have been analyzed. In total, images from 18 different dates were included. Altogether, 56 forest stands with stem volume in the range of 45-650 m3 ha-1 (average 325 m3 ha-1) were analyzed by relating backscatter intensity to field data. The estimation accuracy of stem volume at stand level was calculated in terms of root mean square error (RMSE). For the best case investigated an RMSE of 30% was obtained for one of the single polarization images acquired in the winter season. In this case no saturation was observed for high stem volumes. The corresponding RMSEs for the dual and quad polarization images were between 62%, and 81%. The better results for single polarization might be explained by particularly favourable weather conditions at image acquisition. An extended evaluation will be performed to verify the cause.

Nyckelord: Stem volum, SAR, ALOS, boreal forest



Denna post skapades 2008-01-09. Senast ändrad 2016-05-24.
CPL Pubid: 65287

 

Institutioner (Chalmers)

Institutionen för radio- och rymdvetenskap, Radarfjärranalys (2005-2010)

Ämnesområden

Rymd- och flygteknik
Miljöteknik
Fjärranalys
Skogsuppskattning och skogsindelning

Chalmers infrastruktur