Análisis de la firma espectral en la especie Polylepis reticulata con imágenes sentinel 2 en el bosque Sachafilo, parroquia Pasa, cantón Ambato, provincia de Tungurahua.

Abstract

The objective of this study was to analyze the spectral signature of Polylepis reticulata species with Sentinel 2 images in the Sachafilo forest, Parroquia Pasa, canton Ambato, Province of Tungurahua, for this effect, the forest was georeferenced and the data were taken to the ArcGis 10.8 software; two satellite scenes were taken corresponding to the wet and dry seasons; a stratified random sampling was performed and subsequent validation of the data through the confusion matrix to evaluate this classification model, reflectance values were acquired with the sampling to obtain the representative signature of the species, as well as of the other cover the forest in the two seasons of the year; in addition, the cover of the species was determined visually by means of the SAVI index. The signatures obtained for the species in the two seasons of the year did not show a high variation in the wavelength trend, but the dry season signature showed a small decrease in reflectance; as for the signature of the herbaceous cover, there was a similar trend, but with a high variation in reflectivity a medium density vegetation was obtained. The variation of reflectance in the species may be due to factors such as sun angles, shadows and atmospheric conditions, while the variation in reflectance of the herbaceous cover may be due to factors such as sun angles, shadows and atmospheric conditions, reflectance variation in herbaceous cover may be due to the presence of pests, ambient temperature, phenological state and even activities such as flowering and germination. It is recommended to apply similar studies on other forest species in order to determine their effects and to look for alternatives to reduce their impact.