Vol. 5, No. 2, 199-207, 2006

Envisat ASAR polarization experiment in Peter the Great Bay, Japan Sea: Preliminary results
Leonid M. Mitnik, Vyacheslav A. Dubina and Oleg G. Konstantinov

A series of ASAR images with alternating polarization was acquired over Peter the Great Bay, Japan Sea in 2003-2005. A combination of horizontal-horizontal (HH) and vertical-vertical (VV) polarization was used with two different mean incidence angles q = 18.3° and 22.5°. Additionally, the same scenes were sensed on 23 September 2004 by ERS-2 SAR with a delay of about 30 min after the ASAR acquisition. The main aim was to study the polarimetric signatures of the sea surface caused by the oceanic dynamic phenomena as well as by natural and anthropogenic slicks for later use for their detection and classification. During the ASAR and SAR data acquisitions, ground-truth measurements of the sea surface temperature, wind speed and direction as well as polarization images of the sea surface recorded by a polarization video system were arranged at POI Marine Stations and at several coastal points. Wind fields were also retrieved from the SAR images using the CMOD-4 scatterometer algorithm. As a rule, the wind speed during the satellite observations did not exceed 7 m/s so that radar signatures of slicks, eddies, currents, and internal waves were revealed on the SAR images. The HH and VV radar cross-sections soHH and soVV computed from ASAR data decreased with q and the polarization ratio P = soVV/soHH increased. Variations of P in the area around the slicks reached 2-4 dB which calls for further investigations.

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Submitted: 11 June 2005
Revised: 23 Oct 2006
Accepted: 01 Dec 2006
Published: 22 Dec 2006

Mitnik L M, V A Dubina & O G Konstantinov, 2006. Envisat ASAR polarization experiment in Peter the Great Bay, Japan Sea: Preliminary results. EARSeL eProceedings, 5(2): 199-207


EARSeL European Association of Remote Sensing Laboratories, Strasbourg, France


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