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A degradacao das terras em ambientes secos e um processo em que condicoes indesejaveis surge devido a causas naturais e humanas. A seca e uma condicao climatica grave que afeta quase todas as zonas climaticas em todo o mundo, como as regioes semi-aridas sao especialmente suscetiveis a condicoes de seca por causa de sua precipitacao anual baixa elas possuem uma alta sensibilidade as mudancas climaticas. Este estudo utiliza imagens de satelite para avaliar a variacao na cobertura vegetal no semiarido de Pernambuco-Brasil. Neste estudo foi utilizado imagens do satelite Landsat 5 para tres anos 1998, 2006 e 2011. Foram analisadas as caracteristicas espectrais da vegetacao nesses tres anos, utilizando o NDVI (Normalized Difference Vegetation Index), a classificacao supervisionada e dados de chuva. Foi determinado o balanco hidrico para estes anos. Foi obtido que o valor do NDVI depende da quantidade de chuva armazenada no solo. Conclui-se que e importante avaliar a intensidade da chuva no periodo chuvoso e relacionar com a cobertura vegetal do periodo seco. Assim, a cobertura vegetal do periodo seco e dependente da intensidade da chuva no periodo chuvoso.   Land degradation in dry environments is a process in which undesirable conditions arise due to natural and human causes. Drought is a severe weather condition that affects almost all climate zones around the world, such as semi-arid regions are especially susceptible to drought conditions because of its low annual rainfall they have a high sensitivity to climate change. This study uses satellite images to assess the variation in vegetation cover in semiarid region of Pernambuco, Brazil. This study used the Landsat 5 satellite images to three years 1998, 2006 and 2011. the spectral characteristics of vegetation were analyzed in these three years, using the NDVI (Normalized Difference Vegetation Index), the supervised classification and rainfall data. It was determined the water balance for these years. It was obtained that the value of NDVI depends on the quantity of rainfall stored in the soil. In conclusion, it is important to evaluate the intensity of rain in the rainy season and relate to the vegetation cover of the dry period. Thus, the vegetation cover of the dry period is dependent on the rain intensity in the rainy season. Keywords: Vegetable cover, rainfall intensity, water balance, NDVI.

Avaliação do estágio de regeneração do bioma caatinga na microrregião do Araripe, com sensoriamento remoto (Biome regeneration stage evaluation Caatinga in the micro region of Araripe, with remote sensing)