| Technology Application |
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Spatial-temporal analysis of urban heat island effect and surface parameters variation in Nanjing City |
| LI Xinyu, DU Peijun, ALIM Samat |
| Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology, Nanjing University, Nanjing 210023, China |
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Abstract In this paper, ground surface parameters such as normalized difference vegetation index (NDVI), modified normalized difference water index (MNDWI), normalized difference build-up index (NDBI) and normalized difference impervious surface index (NDISI) were extracted from TM (1989) and ETM+ (2001,2010) images of Nanjing, and land surface temperature was retrieved from thermal infrared image so as to make a comparative analysis of factors responsible for the variation of each parameter at the temporal and spatial level. The authors also analyzed the correlations between ground surface parameters and land surface temperatures. The results of the experiments show that land surface temperature is positively correlated with NDISI and NDBI but negatively correlated with NDVI. Further analysis shows that NDISI, NDBI of Nanjing City have been significantly increased, vegetation coverage decreased and the urban heat island effect exacerbated in the past 20 years, and these trends are in accordance with the trend of urban sprawl. The research result of this experiment has certain reference value for revealing the urban heat island effect, optimizing land use allocation and boosting eco-city construction of Nanjing.
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| Keywords
image registration
polynomial regression model
error-in-variables(EIV) model
weighted total least squares(WTLS)
error statistics and analysis
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Issue Date: 28 March 2014
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2014,
Vol. 26
