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doi: 10.12957/geouerj.2012.4824 Resumo A Bacia Hidrografica do Alto Jacui contem cinco reservatorios dispostos em cascata ao longo do seu curso e apresenta a agricultura como principal forma de uso da terra.O objetivo deste trabalho foi o de avaliar o potencial do indice de vegetacao por diferenca normalizada para fins de mapeamento do uso da terra. Foram utilizadas imagens do sensor Moderate-resolution Imaging Spectroradiometer do satelite Terra do periodo de Janeiro de 2009 a junho de 2010 para avaliar as variacoes deste indice. Especificamente, foram utilizados os meses de outubro (primavera) e fevereiro (verao) para fins relacionar com o uso da terra. A acentuada diferenca no indice para o periodo da primavera permitiu a separacao de areas florestais das areas agricolas e foi observado que no verao este indice e alto tanto em floresta quanto em agricultura o que nao permitiu construir um mapa que identificasse estas duas formas de uso da terra. Palavras-chave: Agricultura, Sensoriamento remoto, Barragens, Ocupacao do solo, Mapeamento. Abstract Alto Jacui River Basin has five reservoirs set in cascade throughout its course and presents the agriculture as the main way of land use. The purpose of this paper was to assess the potential of normalized difference vegetation index in order to map the land use out. It was utilized images from the Moderate-resolution Imaging Spectroradiometer sensor of Terra satellite. Images from January 2009 to June 2010 were used to assess the variations of this index. Specifically, it was used images from the months of October (spring) and February (summer) in order to relate to the soil use. The huge difference in the index at spring time allowed to separate the forestry area and agricultural one and it was perceived that in summer this index is high as in forests as in agriculture, what did not allow to elaborate a map that identify these two ways of landuse. Keywords: Agriculture, Remote sensing, Dams, Soil occupation, Mapping.

DINÂMICA DA VEGETAÇÃO E USO DA TERRA COM USO DO NDVI NA BACIA HIDROGRÁFICA DO ALTO JACUÍ