Title :
Retrieval of Sea Surface Range Velocities From Envisat ASAR Doppler Centroid Measurements
Author :
Hansen, M.W. ; Collard, Florian ; Dagestad, K. ; Johannessen, J.A. ; Fabry, P. ; Chapron, Bertrand
Author_Institution :
Nansen Environ. & Remote Sensing Center, Bergen, Norway
Abstract :
The processing steps and error corrections needed to retrieve estimates of sea surface range Doppler velocities from Envisat Advanced Synthetic Aperture Radar Wide Swath Medium resolution image products are presented. Retrieval accuracies based on examination of the corrected Doppler shift measurements are assessed. The root-mean-square errors of the Doppler shift after bias corrections are found to be 4.7 and 3.9 Hz in VV and HH polarizations, respectively. At 35° incidence angle, this corresponds to horizontal Doppler velocities of 23 and 19 cm/s.
Keywords :
oceanographic regions; oceanographic techniques; remote sensing by radar; synthetic aperture radar; Advanced Synthetic Aperture Radar; Doppler shift measurements; Envisat ASAR Doppler centroid measurements; HH polarization; VV polarization; Wide Swath Medium resolution image; bias corrections; error corrections; incidence angle; processing steps; root-mean-square errors; sea surface range Doppler velocities; Azimuth; Doppler shift; Pixel; Sea surface; Spaceborne radar; Doppler measurements; remote sensing; sea surface; synthetic aperture radar (SAR);
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
DOI :
10.1109/TGRS.2011.2153864
