SIMULATION OF CHLOROPHYLL-A ESTIMATION BY WORLDVIEW-2 IN THE URBAN RIVERS OF THE DOMINICAN REPUBLIC USING FIELD SPECTRAL DATA

摘要

The objective of this study is to simulate chlorophyll-a (Ch1) estimation in the urban rivers of Dominican Republic (DR) by "Worldview-2" (WV-2) satellite which is able to provide high spatial/spectral resolutions. In addition to this, WV-2 has 8 observation bands and among them the Red Edge band (705-745 nm) is attracting attention since it can be used as a new estimation method for high Chi content with high SS (suspended sediment) concentration water bodies. The spectral reflectance and in situ Chi data set were collected from Haina and Ozama-Isabela rivers using a small boat on March 9-10 and June 8-9,2011. The estimation algorithm of Chi using WV-2 data was developed from the data set. Results revealed that in Chi estimations, the reflectance ratio of WV-2 Band 5 (Red band: 630-690 nm) and Band 6 (Red Edge band: 704-745 nm) under eutrophic conditions were effective. Finally, WV-2 data could be considered as a good monitoring tool for the mouth of the rivers which flow into the Caribbean Sea.