Bathymetry Mapping from Satellite Images for Ly Son Island, Quang Ngai Province

Abstract

Up to present, in Vietnam, the traditional methods used to map marine bathymetry are still very popular. These techniques have advantages of giving a high accuracy but still show big disadvantages of taking too much time for the data acquisition and processing and of being very expensive for the field works. Compensated to these cons the remote sensing technique seems to be an ideal solution since the images covers almost places on the earth with very high frequency (hours) of acquisition and served with a reasonable price even some of them can be downloaded from the internet for free of charge. In this paper, LANDSAT-7 (ETM+) optical-multispectral image, a space-born sensor, of Ly Son Island area, Quang Ngai Province where the water is relatively clear was used, some state-of-the-art methods of bathymetry mapping from optical-multispectral satellite images were reviewed and tested, the data from marine chart was used for the model calibration and quality assessment, and the discussion on the potential of these data sources for mapping coastal areas of Vietnam was also conducted.