APPLICATION OF REMOTE SENSING AND GIS TO IDENTIFY CHLOROPHYLL-A IN THE WEST LAKE AREA- HANOI CITY
DOI:
https://doi.org/10.18173/2354-1067.2024-0032Keywords:
Chl-a, West Lake, Remote Sensing, GIS, HanoiAbstract
The decline of water quality in inland lakes is an ongoing concern in large cities, seriously affecting the city outlook and the health of the residents. Chlorophyll-a is one of the important indicators to evaluate the level of eutrophication in lakes. The purpose of this study is to identify the Chlorophyll-a in the West Lake, Hanoi based on Landsat 8-OLI satellite data and field measurement results. Research results show that the Chlorophyll-a in the West Lake area is very high, ranging from 186 - 288 μg/L with a super eutrophication situation. The linear algorithm is used to determine the linear relationship between the ratio of image bands and Chlorophyll–a. Accordingly, the Green/Blue band ratio (B3/B2) is considered the most suitable to determine Chl-a level in the study area with R² = 0.78, average error 44.7. The results of the study confirmed the potential for Landsat data to be used as a free and effective tool for monitoring water quality in inland lakes.
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