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Producing Science-Ready Radar Datasets for the Retrieval of Forest Structure Parameters from Backscatter: Correcting for Terrain Topography and Changes in Vegetation ReflectivityRadar backscatter data contain both geometric and radiometric distortions due to underlying topography and the radar viewing geometry. Our objective is to develop a radiometric correction algorithm specific to the UAVSAR system configuration that would improve retrieval of forest structure parameters. UAVSAR is an airborne Lband radar capable of repeat?pass interferometry producing images with a spatial resolution of 5m. It is characterized by an electronically steerable antenna to compensate for aircraft attitude. Thus, the computation of viewing angles (i.e. look, incidence and projection) must include aircraft attitude angles (i.e. yaw, pitch and roll) in addition to the antenna steering angle. In this presentation, we address two components of radiometric correction: area projection and vegetation reflectivity. The first correction is applied by normalization of the radar backscatter by the local ground area illuminated by the radar beam. The second is a correction due to changes in vegetation reflectivity with viewing geometry.
Document ID
20150007168
Document Type
Conference Paper
External Source(s)
Authors
Simard, M.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Riel, Bryan
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Hensley, S.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Lavalle, Marco
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
May 1, 2015
Publication Date
July 25, 2011
Subject Category
Earth Resources And Remote Sensing
Meeting Information
Meeting: IGARSS (IEEE Geoscience and Remote Sensing Society) Conference
Location: Vancouver
Country: Canada
Start Date: July 24, 2012
End Date: July 29, 2012
Sponsors: Institute of Electrical and Electronics Engineers
Distribution Limits
Public
Copyright
Other
Keywords
polarimetry
vegetation
radar
radiometric correction
Synthetic aperture radar (SAR)

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