Classification of aquatic vegetation in Lake Titicaca based on Sentinel-2 satellite indices
DOI:
https://doi.org/10.53554/boletin.v37i1.362Keywords:
Lago Titicaca, Vegetacion acuática, Macrofitas acuáticas, PunoAbstract
An algorithm was developed for the classification of the aquatic vegetation of Lake Titicaca from the Sentinel-2 satellite vegetation indices and in situ records of the spatial coverage and density of macrophyte species to delimit the extension of the surrounding area of Lake Titicaca between the inner bay of Puno to Acora. MSI (Multispectral Instrument) 10-meter spatial resolution optical images from June and November 2018 were used, to which the Sen2Cor atmospheric correction was applied to obtain the spectral reflectance value on the water surface with which the NDWI, NDVI, band ratio, and AVE indices were
estimated. We adapted the threshold ranges for each vegetation index used in the decision tree method for aquatic vegetation classification according to seasonality and have correspondence with Jaccard’s spatial similarity analysis. The proposed algorithm identified submerged, surface, and emergent aquatic vegetation. The cattail vegetation (emergent) showed a variation of 36 km2 of spatial coverage between both periods analyzed, while the submerged vegetation did not have much spatial variation during the same period. On the other hand, macrophytes submerged at different depths presented different spectral responses according to the density of their spatial distribution.
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