Valuation of accessibility index through high resolution satellite images and geaographic information systems - a methodological proposal. / Determinação do índice de acessibilidade do município de Osasco/SP pelo uso de imagens de alta resolução espacial e SIG - uma proposta metodológica.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Considering the continuous urban growth, the lack of urban planning produces serious consequences whatever the subject. The accelerated and disordered urban sprawl faced by Brazilian cities since the 1950s has levered serious social and economic problems. In this context, the accessibility measures can be used as one of the several indicators to promote urban planning, mainly the highway network infrastructure and the public transportation system planning. This paper addresses a methodology for getting an accessibility index based on Remote Sensing and GIS technologies. Thus, objects of interest are detected from high resolution satellite images and then computed using GIS tools in order to refine the contextual classification process. Moreover, based on these objects as well as those based on the existing transportation road system, an accessibility index map is generated. Metrics of accessibility have been employed to validate the effective use of the proposed methodology for transportation planning. The accessibility measures are described and analyzed through a case of study in the city of Osasco, in the Metropolitan Region of São Paulo, Brazil. The proposed methodology consists in using the IKONOS II images to extract all the information needed to estimate accessibility. In order to do this, the first step is to do an object-based classification of the IKONOS II images. The goal of this classification is to find the commercials and industrial establishments located in the study area, and to extract the highway network of the city. These spatial data are analyzed within a GIS environment and an accessibility index is calculated using the parameters mined from the satellite images. This index is called Commercial and Industrial (C&I) accessibility, and it can be compared with C&I accessibility of other localities. The use of this methodology can be justified based on the fact that there are places with no recorded data or with outdated recorded data (highway network or C&I establishments). In this case, Remote Sensing Technologies can provide support for estimating the accessibility map index. Moreover, Remote Sensing can offer a significant reduction in cost and time for getting the database. The validation of this method is done by calculating the C&I accessibility index of the same study area through recorded data available in the Osasco municipality. These two accessibility index are compared, so it is possible to conclude about the efficiency of the proposed methodology. Therefore, the proposed methodology can be applied and it leads to satisfactory results.

ASSUNTO(S)

objeto (classificação) planejamento territorial urbano geographic information system - gis remote sensing accessibility sensoriamento remoto urban planning imageamento de satélite (classificação) planejamento de transportes high resolution satellite images sistema de informação geográfica object-based classification

ACESSO AO ARTIGO

Documentos Relacionados