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Radarkartering av skogsbiomassa med P-band Pol-InSAR

Radarkartering av skogsbiomassa med P-band Pol-InSAR Lars Ulander, Maciej Soja, Gustaf Sandberg, och Daniel Murdin. Contents. BIOMASS ESA candidate mission P-band satellite SAR Level-2 algorithm development Airborne SAR experiments Biomass retrieval evaluation. ESA:s Earth Explorers.

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Radarkartering av skogsbiomassa med P-band Pol-InSAR

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  1. Radarkartering av skogsbiomassa med P-band Pol-InSAR Lars Ulander, Maciej Soja, Gustaf Sandberg, och Daniel Murdin

  2. Contents BIOMASS ESA candidate mission P-band satellite SAR Level-2 algorithm development Airborne SAR experiments Biomass retrieval evaluation

  3. ESA:s Earth Explorers ESA has six Earth Explorers launched or under development in the Living Earth Program Launched: GOCE, SMOS, Cryosat-2 Under development: ADM-Aeolus, Swarm, Earthcare 7th Earth Explorer Launched currently planned for 2016 Three candidates in phase A: BIOMASS, CoreH20, Premiere Final mission selection with be in 2012 3

  4. BIOMASS: First P-band SAR in space Courtesy: ThalesAlenia Space • Synthetic aperture radar 432-438 MHz (l = 0.7 m) • Large deployable reflector antenna (diameter = 12 m)

  5. BIOMASS: Challenges & solutions Large deployable antenna Heritage from communication antennas (e.g. Inmarsat-4) Ionospheric corrections Faraday rotation corrected by polarimetric analysis Algorithms for global biomass mapping Polarimetry and repeat-pass interferometry (main orbital phase) Multiple baselines, i.e. tomography (initial orbital phase)

  6. Airborne P-band SAR experiments Objectives Temporal stability (correlation) Topography and moisture effects PolInSAR, tomography, P/L-band BioSAR (2007, 2008, 2010), Sweden Boreal forest at Remningstorp, and Krycklan TropiSAR (2009), French Guiana Tropical rain forest at Paracou and Nourages Krycklan Remningstorp Sweden Paracou Nourages French Guiana

  7. BioSAR-1, 2007: Remningstorp • Hemi-boreal forest in southern Sweden • Stand-level biomass 10-290 tons/ha; Managed forest • Topographic height variations are small (120-145 m)

  8. Radar backscatter coefficient vs Biomass SAR data from one date (2 May); similar for other dates HV HH VV Blue crosses: 58 training stands Red circles: 10 validation stands Correlation with biomass is high for HV & HH but low for VV

  9. BioSAR 2007: Height maps Low-altitude high-resolution helicopter scanning lidar 0.25 m grid Airborne P-band repeat-pass PolInSAR 2 m resolution Height (m)

  10. BioSAR 2007: Biomass maps Low-altitude high-resolution helicopter scanning lidar 0.25 m grid Airborne P-band HV-polarisation 2 m resolution Biomass [tons/ha]

  11. Biomass retrieval error Retrieval based on HV-polarisation 2 May, heading 200 deg Stable results for all dates

  12. Conclusions Phase-A for 7th Earth Explorer candidates ends 2011 BIOMASS mission concept matured Large deployable antenna Faraday rotation corrections Biomass retrieval algorithm Level-2 biomass algorithm needs further development Current estimates indicate RMSE = 30-40 t/ha (10-290 t/ha) Topography and moisture corrections Combination estimates BIOMASS end-to-end-simulator

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