Dual-band radar estimation of stem volume in Boreal forest

Yrjö Rauste, Heikki Astola, Heikki Ahola, Tuomas Häme, Felicitas von Poncet

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

    Abstract

    Forest stem volume information is needed in planning of sustainable forestry, mapping of exploitable forest resources, carbon balance studies and many other environmental applications. Radar sensors offer an efficient and weather-independent means for stem volume mapping. The radar dataset consisted of an ALOS/PALSAR dual-polarised scene from September 2008 and four TerraSAR-X spotlight scenes from February-March and July-August 2009. Ground data consisted of plot-wise data and stand-wise data. Regression models were developed with stand-wise training data where the stem volume varied between 0 and 390 m3/ha. The best 3-predictor model - 2 ALOS-PALSAR amplitudes and the phase difference between HH and VV data in a TerraSAR-X scene - produced an RMSE of 46 m3/ha (R2 = 0.7) when evaluated against stands not used in the model training. Stem volume estimation with plot-wise ground data produced lower estimation accuracies. The main reason was most likely mis-registration between the oppositelooking ALOS/PALSAR and TerraSAR-X scenes, which was caused by canopy height and which was not corrected by ortho-rectification with terrain elevation model. In future work, similar look directions should be used when no canopy surface model is available for orthorectification. A filtering approach was developed for using the stand-wise stem-volume model in areas with no forest stand information.
    Original languageEnglish
    Title of host publicationProceedings of the ESA Living Planet Symposium, Bergen, Norway
    Place of PublicationNoordwijk, The Neatherlands
    PublisherEuropean Space Agency (ESA)
    Editioncd-rom
    ISBN (Print)978-92-9221-250-6
    Publication statusPublished - 2010
    MoE publication typeNot Eligible
    EventESA Living Planet Symposium 2010 - Bergen, Norway
    Duration: 28 Jun 20102 Jul 2010

    Conference

    ConferenceESA Living Planet Symposium 2010
    CountryNorway
    CityBergen
    Period28/06/102/07/10

    Keywords

    • radar
    • forestry
    • biomass
    • TerraSAR-X
    • ALOS

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