المملكة العربية السعودية

الجمعية الجغرافية السعودية

المجلة العربية لنظم المعلومات الجغرافية

A Robust Model for Measuring and Extracting Ocean Surface Current Patterns from RADARSAT-1 SAR Images

عدد المشاهدات 78 

Mohamed A. Maiyas (*)

Shattri Mansor, Helmi Zulhaidi bin Mohd Shafri (**)

Vol (5), No. (1), 1433 / 2012

p.p. 25 – 47

Abstract:

A robust model was developed based on Doppler frequency shift that utilizes RADARSAT-1 SAR imageries to measure the sea surface current patterns (velocity and direction). The model applied to three different RADARSAT-1 SAR images (Wide-3, HighExtended-6, and Standard-2) which acquired during the period 20-31 March 2005 in the east coast of Peninsula Malaysia. In situ measurement performed using AWAC equipment to validate the result of the study. The area was divided into four main parts comprising the onshore, fieldwork area, mid-shore, and offshore. The study found a strong relation between the image backscatter, incident angle and Doppler frequency shift. The image processing of the spectral intensity of the SAR data in different modes displayed variation among the four areas. Statistical analysis was used to establish the coefficient of determination between the velocities extracted from SAR data and the real ocean current measurements measured by AWAC during the situ measurements. The present study provides an investigation between different radar modes which can be used as a tool for further research to investigate water current movement.

 Keywords: RADARSAT-1; Doppler frequency shift; robust model; sea surface current

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(*) Head of Geography Department, Faculty of Arts, Sana’a University, P. O. Box: 11412, Sana’a, Yemen, E-mail: mmaiyas@gmail.com.

(**) Department of Civil Engineering, Faculty of Engineering, University Putra Malaysia,  43400 UPM, Serdang, Selangor, Malaysia. E-mails:{shattri, helmi}@eng.upm.edu.my

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