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  • Classification of ground/non-ground: TerraScan from Terrasolid ( DEM: average of ground-points within raster cell, TIN-interpolation of empty raster cells.
  • 271-214: young forest plots
  • 271-214: young forest plots
  • Transcript

    • 1. BioSAR 2010 – A SAR campaign in support to the BIOMASS mission Lars Ulander, Anders Gustavsson Swedish Defence Research Agency (FOI), Sweden Pascale Dubois-Fernandez, Xavier Dupuis Office National d’Études et de Recherches Aérospatiales (ONERA), France Johan Fransson, Johan Holmgren, Jörgen Wallerman Swedish University of Agricultural Sciences (SLU), Sweden Leif Eriksson, Gustaf Sandberg, Maciej Soja Chalmers University of Technology, Göteborg, Sweden
    • 2. BioSAR 2010: Background
      • ESA has funded multiple SAR campaigns in support of the P-band BIOMASS satellite candidate mission
      • Tropical rain forest
        • 2009: TropiSAR in French Guiana
      • Boreal forest
        • 2007: BioSAR-1 in Sweden (Remningstorp)
          • Demonstrated high temporal coherence over 2 months
          • Developed soil moisture corrections using multiple dates
        • 2008: BioSAR-2 in Sweden (Krycklan)
          • Developed topographic corrections using multiple headings
        • BioSAR 2010 in Sweden (Remningstorp) ← this presentation
    • 3. BioSAR 2010: Objectives
      • Ability of detecting, mapping and updated retrieval of changes in forest parameters (due to forest growth or disturbances such as thinning or clear-cuts)
      • Cross-calibration between the ONERA SETHI airborne SAR system (used in 2010) and DLR E-SAR (2007)
      • Robustness of biomass retrieval algorithms with respect to changes in forest conditions
      • Long-term coherence of P-band over forested and other natural surfaces
    • 4. Test Site at Remningstorp Estate, Sweden Stand-level biomass: 0-370 tons/ha Ground topography: 110–150 m asl 1200 hectars divided into over 300 stands Test site location
    • 5. Remningstorp: Tree species Photos of Norway spruce, Scots pine and birch stands
    • 6. BioSAR 2010: Data collections
      • Airborne SAR data using ONERAs SETHI system
        • P-band (260-460 MHz) and L-band (1250-1400 MHz), full polarimetry
        • 10 data acquisition tracks in one flight mission
          • 2 tracks from 2007 repeated to study long-term coherence (challenge!)
          • Vertical offset for PolInSAR (horizontal offset used in 2007)
          • 3 headings to study topographic corrections (2 headings used in 2007)
      • Helicopter lidar data using TopEye MKIII
        • Small footprint (< 0.2 m) and high pulse density (> 10 pulses/m 2 )
      • In situ data
        • Field notes, soil moisture and weather data during the flight
        • Extensive forest field measurements after the flight
        • Maps of clearings and thinnings between 2007 and 2010
    • 7. SAR flights by ONERA on 23 September Two calibration trihedrals P + L, full polarimetry SETHI SAR system
    • 8. Geocoded SAR images (3 headings) R=HH, G=HV, B=VV Geometric error < 2m
    • 9. Helicopter lidar data collection Lidar data in 2007 covered only central part Lidar data in 2010 covered the full extent of the test site
    • 10. Lidar DSM 0.5 raster cell size
    • 11. Field Inventory (200-m grid) by SLU
      • 10 m radius plots
      • Species and diameter for all trees (>40 mm dbh), height and age for a subsample
      • Site variables (field layer, soil type, peat/mineral soil, lateral water movement, production capacity, ground structure)
      • Accurate determination of plot center using post-processed dGPS
      • Total 271 plots surveyed, 214 of these in forest > 50 mm mean dbh
    • 12. Field Inventory (individual trees) by SLU
      • Ten 80 m x 80 m square plots defined and measured in 2007
      • All trees with dbh > 50 mm marked with number tags
      • Accurate determination of position using post-processed dGPS
      • Seven plots remained in 2010 after three were clear-cutted
      • Species, dbh updated 2010-11
      • Additional plots are being measured during summer 2011
    • 13. Initial SAR imagery comparison HH = red HV = green VV = blue Images geocoded to UTM 33 N SETHI has higher (2x) bandwidth E-SAR 2007 SETHI 2010
    • 14. Initial SAR imagery comparison HH = red HV = green VV = blue Clear-cutting easily delineated (red circles) Thinning and growth result in subtle changes E-SAR 2007 SETHI 2010
    • 15. First analysis of mapping changes Color-coded change images 2007 vs 2010 Red: Lower value in 2010 Cyan: Higher value in 2010 Gray: Unchanged value Lidar: Biomass SAR: PHV-pol PHH-pol PVV-pol thinning clear cut
    • 16. Conclusions
      • All planned P/L SAR data acquisitions were collected
        • 10 successful passes; 6 processed and calibrated
      • Ground data collected according to plan
        • Lidar data processed and biomass maps produced
        • Processing of forest field data partly done
      • First results
        • Data are generally of very high quality
        • Change maps from P-band SAR images (SETHI 2010 vs E-SAR 2007) delineate clear-cuts but also other forest features – to be further investigated.