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中文摘要：
以兰州市城关区的TM遥感影像为基础,计算出植被覆盖度和建筑用地指数,完成土地利用分类,通过缨帽变换得到湿度指数.利用单窗算法来反演地表温度,得到热岛效应的分布特征,结合卫星遥感和地统计分析研究热岛效应的分布特征及驱动机制.结果表明,研究区黄土覆盖的丘陵地区和城区建设用地区域对热岛效应贡献较大,是热岛效应的主要驱动力之一.城区热岛效应与植被覆盖度及地表湿度均呈线性负相关,植被和水体对缓解热岛效应有一定作用.热岛效应与城市建筑用地指数呈线性正相关,城市建设所用的材料对热岛效应有较大贡献,密集的人口也是城关区热岛效应的主要驱动力.加强绿化和保留城区水域面积,减少人为排放热量有助于缓解兰州中心城区的热岛效应.
英文摘要：
The TM image of Chengguan District in Lanzhou was used to calculate the vegetation coverage,NDVI and land use classification.The greenness and humidity indexes were obtained through Tasseled Cap Transform based on remote imaging.The single-window algorithm was used to retrieve land surface temperature.Geographic information system and statistical analysis were combined to discuss the distribution characters of the heat island and the mechanism of the research area.Overall,hilly loess region and urban construction land area made a greater contribution to the heat island,which was one of the main driving forces of UHI（urban heat island）.Vegetation and water could relieve the heat island effect.UHI had a negative lineal correlation with vegetation coverage and humidity index.Strengthening urban greening and retaining water area would help ease the center UHI effect in Lanzhou.UHI had a liner correlation with NDBI.Construction materials have also made a contribution to the heat island and human activity is a major driving force of UHI too.The increase of greening land and water areas and reducing emissions could help relieve the heat island effect.
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Analysis of the spatial relationship between heavy metals in soil and human activities based on land
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