Analysis of the angle of view in the spectral behavior of modis images in areas of amazon forest and cerrado
DOI:
https://doi.org/10.5902/2236499434397Keywords:
ZeniAzimuth, Reflectance, Vegetation, Spectral indexAbstract
Variations in the acquisition geometry of remote sensing images influence the spectral response of surface targets. The Moderate Resolution Imaging Spectroradiometer (MODIS) sensor, containing one of the most extensive land surface data collection of the last decade, is profoundly influenced by the acquisition geometry due to its wide view range and high periodicity. The present research aims to evaluate the influence of the angle of view on the spectral behavior of the different MODIS spectral bands and vegetation indices in the Amazon and Cerrado regions. The spectral bands of short-wave infrared and near-infrared showed a high dependence on the angle of acquisition. The areas of the Amazon presented greater interference of the angle of acquisition in comparison with the Cerrado. The application of the NDVI index attenuates the long-term spectral changes.Downloads
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