DETERMINAÇÃO DE ÁREAS IMPERMEÁVEIS POR MEIO DE FERRAMENTAS DE GEOPROCESSAMENTO

Determination of waterproof areas using geoprocessing tools

Abstract

The accelerated urbanization process associated with the government’s lack of planning generates environmental, social and economic impacts. Inherent in the urbanization process, impervious surface coverage appears as one of the main factors that generate these impacts, even becoming an indicator not only of the degree of urbanization, but also of environmental quality. Therefore, it is justifiable to determine the percentage of impermeable areas in the urban perimeter of the city of Goiânia, state of Goiás, Brazil, as well as to determine the quality of drainage in the census sectors, generating a product that supports decision-making by of public managers. For that, we used the object-oriented classification technique implemented in the free InterImage software. The drainage quality map was generated by crossing the impermeable areas, Topographic Wetness Index (TWI) map and access to micro-drainage equipment. The result of the final classification was Kappa index 85%, considered excellent. The urban drainage quality map generated identified that approximately 70% of the study area is found to be very unfavorable and unfavorable, a fact directly related to the current high degree of waterproofing of the study area.

Keywords: Urban Drainage. InterImage. Geoprocessing.