Comparison of NDVI for different species of eucalyptus
Abstract
The study aimed to analyzed the vegetation from NDVI (Normalized Difference Vegetation Index) dynamics in Eucalyptus dunnii and Eucalyptus Urograndis comparing the NDVI generated from the digital numbers obtained from the conversion to apparent reflectance. The satelite images of TM/Landsat 5 sensor was used. Converting digital numbers (DN) to reflectance values and the calculation of the NDVI were obtained through spatial analysis operations Algebraic Geoprocessing Language (LEGAL). It was observed that NDVI values generated from the reflectances are greater than those determined by the DN. This observed difference is physically justified by the corrections made in the image of some parameters such as the minimum and maximum sensor radiances and mean stratospheric solar irradiance. E. dunnii presented higher values of NDVI when compared to E. urograndis, indicating that this is a useful tool when the objective is to identify the species, facilitating the management of the area.
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