ENVISAT ASAR: A speed-gun in space

TittelENVISAT ASAR: A speed-gun in space
PublikasjonstypeConference Proceedings
ForfattereJohannessen, JA, Chapron, B, Collard, F, Mouche, A, Rouault, M, Tounadre, J
Refereed DesignationUnknown
Konferansenavn3rd International Workshop SEASAR 2010
Series/Publication TitleProceedings of the 3rd International Workshop SEASAR 2010. ESA SP-679
Conference Location and DateESA-ESRIN, 25-29 January 2010

Regular access to Doppler shift measurements from Envisat Advanced Synthetic Aperture Radar (ASAR) Wide Swath Mode (WSM) images is now possible. An increasing data set of the radar-detected ocean surface roughness velocities inverted from the Doppler shifts has therefore emerged dating back to mid 2007. This offers an innovative capability to establish time series and gridded maps of Doppler-derived ocean surface velocities. Building on more than 1000 acquisitions from the greater Agulhas Current, the robust results give confidence that the Envisat ASAR can be used as a speed-gun from space. Combined with surface drifter data and altimeter measurements, these new products strengthen the routine monitoring of the intense current regimes.

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