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Environmental Impact of the Urban Growth on the Western Sao Paulo Metropolitan Area

机译：城市发展对西部圣保罗都市圈的环境影响

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Satellite-borne remote sensing data are useful for urban environment analysis owing to their improved spatial, spectral, and radiometric resolution. The present study assess the environmental impact of urban growth on the Western Sao Paulo Metropolitan Area from 1975 to 1985. Multidate digital data from MSS/LANDSAT, TM/LANDSAT, and HRV-SPOT were registered and urban structure changes within that period were detected. Color composite photographs of TM band 5, 3, and 4 were applied to map the urban land use for new urban areas. The HRV-SPOT panchromatic data, digitally enlarged to the scale of 1:10,000 were applied to urban structure mapping and environmental monitoring. Ground truth data collection and helicopter-borne data collection were used to complement the remote sensed data. Several environment degradation levels were determined and compared to the Physical Aptitude for Urban Settlement Chart. The results showed that environmental impacts are more related to the pattern of urban settlement than to the physiographic features. Vegetative cover proved to be the most important key, indicating environmental change as far as orbital remote sensing is concerned. Soil erosion is caused by the removal of vegetative cover, but the erosion rates are controlled by the different patterns of land use.

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