Delineamento amostral em reservatórios utilizando imagens landsat-8/OLI: Um estudo de caso no reservatório de nova avanhandava (estado de São Paulo, Brasil)

The use of remote sensing focused on the determination of field samples is of great value to environmental studies, since the satellite images have attributes able to assess the spectral variability of water surface considering a wide area. Thus, this approach aims to define a stratified working method of selecting samples based on images variability in the visible and infrared wavelengths derived from Landsat-8/OLI sensor. The method relies on the use of raster data representing the standard deviation of a time series of images Landsat-8/OLI and then the automatic setting field points supported by the stratified random sampling. The choice of the image that yielded the selection of the samples was based on the greatest spectral variation component by means of Principal Component technique. As a result were obtained twenty representative points of a total of six spectrally similar classes created by using a Geographic Information System.