Urban heat island effects study based on built-up index and vegetation index in Beijing city

摘要

In this paper, brightness temperature, (Tb), normalized difference built-up index (NDBI) and normalized differencevegetion index (NDVI) were quantitatively derived from Landsat TM` images of Beijing City. Feature profiles of Tb,NDBI and NDVI weredrawn in the directions of NE-SW and NW-SE using the technologies of RS and GIS. Laws ofspatial distribution of the relationships between Tb and NDBI, Tb andNDVIwere discussed. The results showed that: 1)there is a significant positive correlation between 7b and NDBI, and a significant negetive correlation between 7b andNDVI. 2) The.less distance between the other profiles and the central profile is, the stronger the negative correlationbetween Tb and NDVI is, the stronger the positive correlation between Tb andNDBIis. 3) The relationship between Tband NDBI, Tb andNDVIis affected by the complexity of land use structures. The more complex the land use structure is,the stronger the relationship between Tb andNDBI, TbandNDVIof feature profile are. This paper effectively reveals thespatial correlations between temperature and building and vegetion, and thus can provide certain scientific supports forBeijing's urban and greenland planning in the future.