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Spectral analysis using LANDSAT images to monitor the chlorophyll-a concentration in Lake Laja in Chile

2020; Elsevier BV; Volume: 60; Linguagem: Inglês

10.1016/j.ecoinf.2020.101183

1878-0512

Lien Rodríguez‐López, Iongel Duran-Llacer, Lisdelys González-Rodrı́guez, Rodrigo Abarca‐del‐Rio, Rolando Cárdenas, Óscar Parra, Rebeca Martínez-Retureta, Roberto Urrutia,

Remote Sensing and Land Use

In this study remote sensing was used as an early alert tool for chlorophyll-a changes in a continental aquatic ecosystem in central Chile. To this end, 14 LANDSAT images of Laja Lake (36° 54 'S, 71° 05' W, 1,360 meters above sea level) were taken over a 6-year period. Eleven spectral indexes were calculated. At the same time, chlorophyll-a concentrations were determined experimentally. Correlations between vegetation indices and chlorophyll-a concentrations in different monitoring zones were established. The indices that presented a good correlation were NDVI and GNDVI. A new regression model was developed that allows the primary productivity values of Laja Lake to be estimated using satellite data. Finally, chlorophyll-a maps were created.