Satellite-based remote sensing of suspended sediments along the coast of Guyana.

摘要

This study utilized Landsat Multi-spectral, Thematic Mapper, and Enhanced Thematic Mapper + data from the Guyana coast for obtaining insights on the temporal variations and spatial distribution of suspended sediments in the nearshore environment.;The obtained results permitted testing and acceptance of two hypotheses. The spectral wavelength range of 0.52-0.7 micrometers was found to be very appropriate for identifying suspended sediments in coastal waters. The regression plot and percentage difference maps permitted the claim that there were temporal increases in suspended sediments in the coastal waters of Guyana.;Data from twenty-five spectral bands representing 1985, 1992, 1999 and 2002 were analyzed with the Idrisi and the ArcGIS 9.0 software. Results from the principle components analysis (PCA) highlighted the importance of Band 2 (0.6-0.7 micrometers) for the 1985 image, Band 3 (0.63-0.69 micrometers) for the 1992 image, Band 2 (0.52-0.60 micrometers) for the 1999 image and Band 3 (0.63-0.69) for the 2002 image. The PCA bands were integrated in ArcGIS 9.0, and sediment polygons were delineated. Sediment difference maps were produced which demonstrated that suspended sediments in the coastal waters increased for the period 1985 to 2002.