radarkartering av skogsbiomassa med p-band pol-insar
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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Radarkartering av skogsbiomassa med
P-band Pol-InSAR
Lars Ulander, Maciej Soja, Gustaf Sandberg, och Daniel Murdin
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Contents
• BIOMASS
• ESA candidate mission
• P-band satellite SAR
• Level-2 algorithm development
• Airborne SAR experiments
• Biomass retrieval evaluation
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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
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BIOMASS: First P-band SAR in space
Courtesy: ThalesAlenia Space
• Synthetic aperture radar 432-438 MHz ( = 0.7 m)
• Large deployable reflector antenna (diameter = 12 m)
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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)
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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
Sweden
Finland
Norway
Denmark
Remningstorp
30°E
20°E
20°E
10°E
10°E0°
70°N70°N
65°N65°N
60°N60°N
55°N 55°N
Remningstorp
Krycklan
French Guiana
Paracou
Nourages
Sweden
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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)
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Radar backscatter coefficient vs Biomass
Blue crosses: 58 training standsRed circles: 10 validation stands
HV HH VV
SAR data from one date (2 May); similar for other dates
Correlation with biomass is high for HV & HH but low for VV
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BioSAR 2007: Height maps
Low-altitudehigh-resolution helicopter scanning lidar
0.25 m grid
Hei
ght
(m)
Airborne P-band repeat-pass PolInSAR
2 m resolution
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BioSAR 2007: Biomass maps
Low-altitudehigh-resolution helicopter scanning lidar
0.25 m grid
Airborne P-band HV-polarisation
2 m resolution
Bio
mas
s [t
ons/
ha]
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Biomass retrieval error
2 May, heading 200 deg
Retrieval based on HV-polarisation
Stable results for all dates
9 Mar 2 April 2 May
RMSE validation
32 t/h 35 t/h 42 t/h
RMSE cross-validation
33 t/h 34 t/h 34 t/h
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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