Extraction of ocean wave parameters by ALOS/PALSAR

Author

Isoguchi, Osamu ; Shimada, Masanobu

Author_Institution

ALOS Data Anal. & Res. Project Group, Remote Sensing Technol. Center of Japan (RESTEC), Tsukuba, Japan

fYear

2011

fDate

26-30 Sept. 2011

Firstpage

1

Lastpage

4

Abstract

Wave parameters were extracted from L-band Synthetic aperture radar (SAR), PALSAR aboard ALOS. About 200 match-ups between PALSAR 3.8×3.8km images observed with HH polarization and 34.3° off-nadir angle and buoy wave information were collected for the detection. We applied two methods, an empirical approach and a two-step inversion based on forward non-linear modulation transfer function (MTF). Comparisons with buoy data showed that significant wave heights (SWHs) correlated relatively well with the correlation of 0.85 and the RMS error of 0.66m. Whereas dominant wave periods tended to be overestimated for higher frequency waves, which is attributed to cases having double-peak and/or wind waves propagating in azimuth direction. In the two-step inversion, accuracy of included wind information is critical for better extraction.

Keywords

geophysical signal processing; inverse problems; ocean waves; oceanographic equipment; oceanographic techniques; optical transfer function; remote sensing by radar; synthetic aperture radar; wind; ALOS-PALSAR; HH polarization; L-band SAR; buoy wave information; double peak waves; empirical approach; forward nonlinear MTF; modulation transfer function; ocean wave parameter extraction; off nadir angle information; significant wave height; synthetic aperture radar; two step inversion; wind waves; Accuracy; Azimuth; Estimation; L-band; Ocean waves; Oceans; Synthetic aperture radar; ALOS/PALSAR; Ocean Wave; SAR;

fLanguage

English

Publisher

ieee

Conference_Titel

Synthetic Aperture Radar (APSAR), 2011 3rd International Asia-Pacific Conference on

Conference_Location

Seoul

Print_ISBN

978-1-4577-1351-4

Type

conf

Filename

6087003