APPLICATION OF REMOTE SENSING AND GIS TO IDENTIFY CHLOROPHYLL-A IN THE WEST LAKE AREA- HANOI CITY

DOI: 10.18173/2354-1067.2024-0032

Abstract

The decline of water quality in inlandlakes is an ongoing concern in large cities,seriously affecting the city outlook and the healthof the residents. Chlorophyll-a is one of theimportant indicators to evaluate the level ofeutrophication in lakes. The purpose of this studyis to identify the Chlorophyll-a in the West Lake,Hanoi based on Landsat 8-OLI satellite data andfield measurement results. Research results showthat the Chlorophyll-a in the West Lake area is veryhigh, ranging from 186 - 288 µg/L with a supereutrophication situation. The linear algorithm isused to determine the linear relationship betweenthe ratio of image bands and Chlorophyll–a.Accordingly, the Green/Blue band ratio (B3/B2) isconsidered the most suitable to determine Chl-alevel in the study area with R² = 0.78, average error44.7. The results of the study confirmed thepotential for Landsat data to be used as a free andeffective tool for monitoring water quality in inlandlakes.