материалы конференции

En

International Geoscience and Remote Sensing Symposium (IGARSS)

ISSN:2153-6996

2018

Chapron, B.²

Rascle, N.²

Collard, F.¹

10.1109/IGARSS.2018.8518459

The reconstruction of ocean surface wave characteristics, i.e. directional energy distribution and dispersion, from ocean sunglitter images is discussed. Wave spectral analysis is performed, through the definition of linear transfer functions, to relate image brightness variations and sea surface slopes. Surface-current Doppler shift modifies the wave dispersion relation and can be obtained from cross-correlating two images and tracking glint changes over a known time. The technique is tested on photographs, taken from an aircraft in the Gulf of Mexico, and from a drone in the Black sea. The method is further extended to satellite sunglitter imagery, taking advantage of the technical peculiarities of Sentinel-2 sensors helping to infer both the brightness gradient in the along-track direction. Wave dispersion information through the inter-channel time delay allows to reconstruct the current vector. The results demonstrate encouraging prospects of using the sunglitter imagery for the sea state monitoring, including formation of abnormally high waves and the study of wave-current interactions at different scales.

WAVE SPECTRUM, OCEAN CURRENTS, SUNGLITTER, SEA SURFACE PHOTOGRAPHY, SENTINEL-2

2018-12-12 15:49:00