Title :
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
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;
Conference_Titel :
Synthetic Aperture Radar (APSAR), 2011 3rd International Asia-Pacific Conference on
Conference_Location :
Seoul
Print_ISBN :
978-1-4577-1351-4
