Modelo Batimétrico derivado de imágenes Landsat ETM+ en zonas de arrecifes tropicales

Abstract

For mapping and monitoring coral reefs, a bathymetric map is useful as a base map. Different methods have already been developed to map bathymetry using remote sensing. Two main groups can be distinguished. One group is using active remote sensing data; the other is based on passive sensor generated multi-spectral infor- mation. In this article, the focus is on the passive data method. A modified DOP “depth of penetration” mapping method was implemented on a Landsat ETM+ image over Archipélago San Andrés (Colombia). Depth measurements used in the validation of the model were derived from the interpolation of bathymetric maps. The accuracy test revealed that the resulting bathymetric map is useful for coral reef mapping, but care should be taken when using it. Deviations from reality were caused by assumptions inherent to the theory used, data interpolation, satellite im- age characteristics and errors during implementation of the method.