Mapeamento de superfícies impermeáveis em áreas urbanas utilizando imagens índices geradas pelo sistema LANDSAT-5 THEMATIC MAPPER
DOI:
https://doi.org/10.20396/sbgfa.v1i2017.2232Palavras-chave:
Superfície impermeável. NDBI. NDVI. Built-upResumo
As áreas de superfície impermeáveis são indicativas de urbanização e por meio do mapeamento dela é possível mensurar os impactos que a urbanização gera no ecossistema urbano. O sensoriamento remoto constitui uma ferramenta valiosa que permite não só mapear a diversidade de uso e cobertura vegetal como também estimar a porcentagem de cobertura impermeável. Assim, este estudo teve como objetivo estimar por meio de imagens multiespectrais do satélite Landsat-5 TM as superfícies impermeáveis existentes na mancha urbana de São José dos Campos, SP. A estimativa de superfície impermeável foi feita por meio de três índices: o Normalized Difference Built-up Index (NDBI), Normalized Difference Vegetation Index (NDVI) e Built-up (BU). Para a validação dos resultados obtidos, foi utilizado imagens ortorretificadas do satélite QuickBird com resolução de 0.5 metros.
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