padrões de autocorrelação espacial de índices de vegetação modis no bioma cerrado spatial autocorrelation patterns of the modis vegetation indices for the cerrado biome

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ID: 217736
2008
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Abstract
Embora os índices de vegetação MODIS estejam sendo extensivamente investigados quanto ao seu potencial para o mapeamento e monitoramento biofísico do bioma Cerrado, em particular no que diz respeito à sazonalidade e fenologia da cobertura vegetal, pouco se sabe sobre o comportamento espacial desses índices em escalas regionais. Assim, neste estudo foram avaliados, à escala adotada em estudos de macroecologia (Resolução de 1º x 1º), os padrões de autocorrelação espacial do EVI (índice de vegetação realçado) e NDVI (índice de vegetação da diferença normalizada), utilizando-se índices I de Moran obtidos em diferentes classes de distância geográfica (correlogramas espaciais). Em média, os valores apresentados por esses índices são autocorrelacionados até uma distância aproximada de 800 km, que pode revelar um padrão de manchas afetado por variação ambiental e conversão da vegetação nativa. No entanto, esses padrões de similaridade espacial são principalmente influenciados pelo contraste sazonal encontrado no bioma Cerrado, bem como em função dos padrões de cobertura da terra e do tipo de índice considerado (i.e., EVI ou NDVI).
While the MODIS vegetation indices have been extensively investigated regarding their potential for mapping and biophysical monitoring of the Cerrado biome, particularly with respect to the seasonality and phenology of the vegetative cover, very little is known about the spatial behavior of these indices. Thus, this study assessed, at the "macroecology" scale (1º x 1º spatial resolution), the autocorrelation patterns of both the EVI (enhanced vegetation index) and NDVI (normalized difference vegetation index), using Moran's I coefficients obtained for several geographic distance classes (spatial correlogram). On average, the values presented by these two indices are correlated up to a distance of about 800 km, possibly revealing a patch pattern affected by environmental variables and native vegetation conversion. On the other hand, these spatial similarity patterns are mainly influenced by the marked seasonal contrast of the cerrado biome, as well as by the land cover classes and the vegetation index considered (i.e. EVI or NDVI).
Reference Key
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Authors ;Fábio Martins Vilar de Carvalho;Laerte G. Ferreira;Fabio C. Lobo;José Alexandre Felizola Diniz-Filho;Luís Maurício Bini
Journal journal of veterinary medical research
Year 2008
DOI
10.1590/S0100-67622008000200011
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-67622008000200011
Keywords
spatial autocorrelation and cerradoforestry

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