Características e desafios de geração do NDVI para o Brasil a partir de dados do satélite de órbita geoestacionária Meteosat-10

Abstract

Monitoring land cover from environmental indicators enablesa better understanding of biophysical and ecological processes, helping to understand the dynamics of land use to make decisions. Polar orbit satellites, for the most part, provide NDVI (Normalized Difference Vegetation Index) products with medium spatialresolution (250 m to 1 km) from image compositions (7, 10 or 16 days). On the other hand, geostationary orbit satellites provide NDVI with low spatial resolution (1 to 3 km) and high temporal resolution (10 to 25 minutes). Particularly, the MSG is efficient for the monitoring of vegetation from the NDVI index for regions of Africa, having a high spatial correlation with data from polar satellites, have been used in the analysis and detection of water stress of vegetation and phenology with significant advantages in the time series analysis. However, for Brazil, there are limitations that need to be known for developing NDVI MSG product quality. This paper aims to present how the MSG is used to monitor surface processes from the NDVI vegetation index, in order to identify the challenges inherent in product development for Brazil. For this, the main features of the NDVI are presented, the history of the global coverage product and a discussion about the main challenges of the NDVI MSG for Brazil, related to low spatial resolution on Brazil, atmospheric and geometric corrections and characteristics of the panchromatic image and the spectral channels.