基于Landsat TM的西安市城市热岛效应研究

在全球高速城市化的背景下,城市热岛被认为是主导整个城市环境的要素之一,在城市公共健康、空气质量、能源消耗等方面已产生深远影响.笔者利用Landsat TM影像对西安市热岛情况和城区土地覆被进行解译,得到西安市土地利用图和热岛相对强度空间分布图,并研究分析了城市热岛同城市土地覆被之间的关系.土地覆被类型亮温分布由高到低依次是：商业和工业用地、未利用地、居民住宅用地、绿地、水体;亮温与NDVI有良好的反相关关系.通过对西安热环境的研究揭示了城市空间结构和城市规模的发展变化,有助于引导西安市的可持续发展,提高人居环境质量,为城市综合评价和生态环境建设提供依据.

Study on City Heat Island in Xi'an Baded on Landsat TM

Urban heat island was regarded as the most aspect in the urban environment and had profound effect on public health,air quality and energy consumption and so on in global warming and high speed urbanization context.Land use and spatial distribute of heat island of Xi'an based on TM image were obtained and the relationship between urban heat island and land cover was analyzed.The brightness of land cover types distribute from high to low was:commercial and industrial,uncultivated,residential,Greenland,water;anticorrelation was good enough between brightness and NDVI.This study opened out the change of urban space structure and urban scale.The development and change of the urban space structure and city scale were shown through the study on environment of heat island for Xi'an,which helped to quide the sustainable development of Xi'an,improve the environmental quality of the human settlements,offer the basis for comprehensive appraisal of the city and constructions of ecological environment.