Potential of ASAR/Envisat Data for Mud Bank Monitoring in French Guiana Compared to ASTER Imagery
- 1 November 2007
- journal article
- Published by Coastal Education and Research Foundation in Journal of Coastal Research
- Vol. 236, 1509-1517
- https://doi.org/10.2112/05-0477.1
Abstract
In French Guiana, the constant migration of large mud banks resulting from the Amazon River's sedimentary discharge has a negative impact on the local economy. Two radar images from the new ASAR/Envisat sensor have been analysed and compared to one ASTER image to assess their potential for mud bank monitoring. Bathymetric data were also recorded at times close to those of the satellite acquisitions, enabling a comparative study of the mud bank morphology and bathymetry and satellite information. The emerged parts of the mud banks, whether consolidated/solid (slikke or mudflats, mud bars, etc.) or fluid mud are easily detectable on the ASAR images. However, the results show that mud bank covered by a shallow layer of water (a few tens of centimetres) is not detectable on ASAR images. For deeper waters the ASAR signal is independent of water depth. ASAR's multipolarized images provide little more information than that obtained from older sensors having only a single polarization (ERS-1/2 and RADARSAT-1). The Horizontal transmit and Horizontal receive (HH) and Vertical transmit and Vertical receive (VV) polarizations have equivalent cartographic potentials, markedly superior to that provided by the VH polarization. However, the VH brings out certain information that is hard or impossible to see in HH or VV, for example, some offshore emerged portions of the banks, and provides a better separation between water and coastal mangrove forest. The ASTER image enables effective mapping of the extent of emerged mud banks and identification of three classes of water depth.Keywords
This publication has 9 references indexed in Scilit:
- Mudflats and mud suspension observed from satellite data in French GuianaMarine Geology, 2004
- Geomorphic evolution of a coastal mudflat under oceanic influences: an example from the dynamic shoreline of French GuianaMarine Geology, 2004
- Coastline and mudbank monitoring in French Guiana: contributions of radar and optical satellite imageryCanadian Journal of Remote Sensing, 2004
- Potential of ERS and Radarsat data for surface roughness monitoring over bare agricultural fields: Application to catchments in Northern FranceInternational Journal of Remote Sensing, 2002
- Remote sensing of temporal and spatial variations in pool size, suspended sediment, turbidity, and Secchi depth in Tuttle Creek Reservoir, Kansas: 1993Geomorphology, 1998
- Interpretation of SAR Images for Coastal Zone Mapping in GuyanaCanadian Journal of Remote Sensing, 1996
- The use of Landsat imagery to map fluvial sediment discharge into coastal watersMarine Geology, 1995
- Recent and subrecent changes in the dispersal of amazon mudNetherlands Journal of Sea Research, 1991
- Migration of mud banks and changing coastline in French GuianaMarine Geology, 1988