Aquino, C.M.S. de 2016. Temporal Variation of The Normalized Difference Vegetation Index (NDVI) at the Serra da Capivara National Park, Piauí, Brazi. Notheast Geoscience Journal. 2, (Oct. 2016), 640–649. DOI:https://doi.org/10.21680/2447-3359.2016v2n0ID10511.