Análise da expansão urbana no entorno da Lagoa Grande e Lagoa da Tabua no município de Feira de Santana-BA a partir de série histórica de imagens Landsat MSS, TM e ETM

The need for protection of the water resources, in especial the urban water resources, rises each day, along with the disordered expansion of the cities. For that reason, the tools of spatial analysis, the Remote Sensing and Cartography that came up as a powerful evaluative instrument of the environmental impacts. Based on this understanding that the objective of that work is to accomplish a multi-temporal mapping at the surrounding of Grande Lagoon and Tabua Lagoon; in the period from 1975 to 2008, the choice of that period is due to the fact of the population boom, caused by the industrialization of the municipal district. For the accomplishment of this work it will be used the available satellite images. It will be used the sensors MSS, TM and ETM. The adopted technical procedures, in the construction of that work will consist in the following stages. The geo-referenced of images, applying the enhancement and contrast techniques, Supervised Classification. A classic method for processing giving greater focus the evaluation of the images(seasonality of the region) and the correlating environmental impact with official statistics. It was possible by this method to identify some indicators of environmental imbalance, such as the advancement of urban space implying sedimentation pond of the Tabua, and the presence of cattail, aquatic vegetation common in heavily polluted areas in the Grande Lagoon.