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Effect of Land Cover Fractions on Changes in Surface Urban Heat Islands Using Landsat Time-Series Images

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  • Tao Chen

    (Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China)

  • Anchang Sun

    (Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
    Beijing North-Star Digital Remote Sensing Technology Co.Ltd., Beijing 100120, China)

  • Ruiqing Niu

    (Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China)

Abstract

Man-made materials now cover a dominant proportion of urban areas, and such conditions not only change the absorption of solar radiation, but also the allocation of the solar radiation and cause the surface urban heat island effect, which is considered a serious problem associated with the deterioration of urban environments. Although numerous studies have been performed on surface urban heat islands, only a few have focused on the effect of land cover changes on surface urban heat islands over a long time period. Using six Landsat image scenes of the Metropolitan Development Area of Wuhan, our experiment (1) applied a mapping method for normalized land surface temperatures with three land cover fractions, which were impervious surfaces, non-chlorophyllous vegetation and soil and vegetation fractions, and (2) performed a fitting analysis of fierce change areas in the surface urban heat island intensity based on a time trajectory. Thematic thermal maps were drawn to analyze the distribution of and variations in the surface urban heat island in the study area. A Multiple Endmember Spectral Mixture Analysis was used to extract the land cover fraction information. Then, six ternary triangle contour graphics were drawn based on the land surface temperature and land cover fraction information. A time trajectory was created to summarize the changing characteristics of the surface urban heat island intensity. A fitting analysis was conducted for areas showing fierce changes in the urban heat intensity. Our results revealed that impervious surfaces had the largest impacts on surface urban heat island intensity, followed by the non-chlorophyllous vegetation and soil fraction. Moreover, the results indicated that the vegetation fraction can alleviate the occurrence of surface urban heat islands. These results reveal the impact of the land cover fractions on surface urban heat islands. Urban expansion generates impervious artificial objects that replace pervious natural objects, which causes an increase in land surface temperature and results in a surface urban heat island.

Suggested Citation

  • Tao Chen & Anchang Sun & Ruiqing Niu, 2019. "Effect of Land Cover Fractions on Changes in Surface Urban Heat Islands Using Landsat Time-Series Images," IJERPH, MDPI, vol. 16(6), pages 1-18, March.
    • Handle: RePEc:gam:jijerp:v:16:y:2019:i:6:p:971-:d:214914
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    References listed on IDEAS

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    1. Harlan, Sharon L. & Brazel, Anthony J. & Prashad, Lela & Stefanov, William L. & Larsen, Larissa, 2006. "Neighborhood microclimates and vulnerability to heat stress," Social Science & Medicine, Elsevier, vol. 63(11), pages 2847-2863, December.
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    Cited by:

    1. Matthew D. Senyshen & Dongmei Chen, 2023. "The Impact of Land Cover Change on Surface Water Temperature of Small Lakes in Eastern Ontario from 1985 to 2020," Land, MDPI, vol. 12(3), pages 1-18, February.

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