Mr. Liqin Cao Profile

Liqin Cao

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Proceedings Article | 29 December 2008 Paper

Impact of impervious surface on urban heat island in Wuhan, China

Liqin Cao, Pingxiang Li, Liangpei Zhang

Proceedings Volume 7285, 72855H (2008) https://doi.org/10.1117/12.815911

KEYWORDS: Landsat, Vegetation, Roads, Spectral models, Temperature metrology, Remote sensing, Lithium, Statistical analysis, Satellites, Earth observing sensors

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Impervious surfaces (IS), as one of the most important land cover types and characteristic of urban/suburban¹ environments, are known to effect urban surface temperatures by altering the sensible and latent heat fluxes. This study examined the effect IS spatial patterns have on land surface temperature (LST) in Wuhan, China. LST were retrieved from the corrected TIR band (10.4~12.5μm) of Landsat images using Single-Channel method. IS distribution, together with vegetation and soil distribution, was estimated through a fully constrained linear spectral mixture model. Four endmembers, vegetation, soil, low albedo, and high albedo were selected to model heterogeneous urban land cover. Impervious surface fraction was estimated by analyzing low and high albedo endmembers. Correlation analyses were conducted to investigate the changing relationship of LST with impervious surface. The result indicated there was a strongly positive relationship (r²>0.85) between LST and percent impervious surface for all seasons, which suggested the variations in LST could be accounted for very well by percent impervious surface.

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