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Movimentos de massa sao fenomenos naturais caracterizados pelo deslocamento de solo e rocha vertente abaixo. Quando esses processos ocorrem em areas urbanizadas, podem causar perdas economicas, impactos sociais e, em casos extremos, perda de vidas humanas. Na tentativa de mitigar tais desastres, torna-se necessario mapear os locais ja afetados pelos mesmos, uma vez que escorregamentos recentes podem sugerir futuros padroes de instabilidade. Nesse sentido, este trabalho teve por objetivo mapear as cicatrizes de movimentos de massa em um segmento da Borda Oriental da Bacia do Parana, por meio do processamento de uma imagem Landsat 5-TM, orbita/ponto 220/80, data de passagem 28/08/2009. Para facilitar a discriminacao destas feicoes, elaboraram-se composicoes coloridas RGB e processamentos tais como Ampliacao Linear de Contraste (ALC), razao entre bandas e Analise por Componentes Principais (PCA). A fim de validar o inventario elaborado, utilizaram-se imagens de alta resolucao disponiveis no software Google Earth®. Ao total, foram identificadas 63 cicatrizes com a imagem Landsat 5-TM e 121 cicatrizes com as imagens do Google Earth®. Os principais tipos de movimentos de massa mapeados sao escorregamentos translacionais rasos e corrida de detritos. A identificacao das cicatrizes foi possivel devido as diferencas de tonalidade, cor, matiz e textura nas imagens orbitais apos a ocorrencia desses processos. Os resultados obtidos representam um passo inicial para a analise da suscetibilidade da area.  A B S T R A C T Mass movements are natural phenomena characterized by the downslope movement of soil and rock. When these processes occur in urban areas they can cause economic losses, social impacts and, in extreme cases, loss of human lives. In an attempt to mitigate such disasters, it is necessary to map sites affected by them, since recent landslides may suggest future patterns of instability. In this sense, this study aimed to map the mass movement scars in a segment of the Eastern Edge of the Parana Basin, through the processing of a Landsat 5-TM image, 220/80 orbit-point and date of passage 08/28/2009. To facilitate the recognition of these features, RGB color compositions and image processing techniques such as contrast stretching, ratio between bands and Principal Component Analysis (PCA) were applied. In order to validate the inventory, high-resolution images available at Google Earth® software were used. Totally, 63 scars were identified with the Landsat 5-TM image and 121 with Google Earth® images. The main types of mass movements mapped are translational landslides and debris flows. The identification of the scars was possible due to differences in tone, color, hue and texture at the orbital images after the occurrence of such processes. Results obtained represent an initial step towards the susceptibility analysis of the area. Keywords : Landslide inventory; Digital image processing; Satellite images; Geoprocessing.

revista brasileira de geografia física

Identificação de Cicatrizes de Movimentos de Massa na Borda Oriental da Bacia do Paraná com base em Imagens Landsat 5-TM (Identification of Landslides Scars in the Eastern Edge of the Paraná Basin)