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.

在这项研究中，遥感被用作智利中部大陆水生生态系统中叶绿素-a变化的预警工具。为此，在6年内拍摄了14幅Laja湖的LANDSAT图像（南纬36°54'，西纬71°05'，海拔1,360米）。计算了11个光谱指数。同时，通过实验确定叶绿素a的浓度。建立了不同监测区植被指数与叶绿素a浓度的相关性。呈现良好相关性的指标是NDVI和GNDVI。开发了一个新的回归模型，可以使用卫星数据估算拉贾湖的主要生产力值。最后，创建了叶绿素-a图。