Abstract
Urban heat island means the urban area has a higher temperature than peripheral regions, especially in summer. The result that urban temperature is higher than rural area is because the special urban underlining surface, human heat resources and local atmosphere circumfluence. Study indicates that urban land surface temperature and urban vegetation fraction are two important factors in urban heat island (HI) research. By retrieving urban land surface temperature and urban vegetation fraction with ASTER data, this article presents the approximate linear relation between urban land surface temperature and urban vegetation fraction. The result reveals that the ASTER images can be used in urban heat island research to reflect the temperature distribution, illustrate the heat intensity and provide macroscopic data support for the decision-making departments. The urban land surface temperature can be the most important evaluation factor in urban heat island.
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