基于Landsat8的城市热岛效应与地表因子关系研究——以长春市为例
发布时间：2018-11-23 20:17
【摘要】：城市化进程导致的城市热岛问题成为21世纪人类需要面对的重要问题之一。文中以长春市为例,使用2014年Landsat8 OLI和TIR数据分析了城市热岛效应与地表因子之间的关系。基于Landat8 TIR数据特点,选用分裂窗算法反演地表温度用于表征城市热环境并分析其空间格局特征。基于"植被-不透水面-土壤"模型,探讨了线性光谱混合模型得到的城市不透水面和植被盖度作为表征城市人为建筑和绿地信息的能力。结果表明:长春市大部分区域有明显的城市热岛效应,占比约45%,其中最显著的区域位于缺少植被覆盖的大片连续分布的不透水面区域;不同城市土地覆被类型的地表温度差异明显,平均地表温度从高到低的土地覆被类型依次为不透水面、裸土、耕地、绿地和水体,各类型平均温度和最高温度的最大温差分别达到8.2和16.1℃;与归一化建筑指数和植被指数相比,光谱解混得到的不透水面比例和植被盖度与地表温度之间的关系更为显著,是表征城市建筑和绿地信息更优的指示因子,其相关关系表明城市建筑能够增加城市热岛效应而城市绿地具有降温效应。
[Abstract]:The urban heat island problem caused by the urbanization process has become one of the important problems that human beings have to face in the 21st century. Taking Changchun as an example, the relationship between urban heat island effect and surface factors is analyzed by using Landsat8 OLI and TIR data in 2014. Based on the characteristics of Landat8 TIR data, the split-window algorithm is used to retrieve the surface temperature to characterize the urban thermal environment and to analyze its spatial pattern. Based on the "vegetation-impermeable surface-soil" model, the ability of urban impermeable surface and vegetation coverage obtained from the linear spectral mixing model to represent the information of urban artificial buildings and green space was discussed. The results show that there are obvious urban heat island effects in most areas of Changchun, accounting for about 45%, and the most significant areas are located in a large area of continuous distribution of impervious surface lacking vegetation cover. The difference of land surface temperature among different urban land cover types is obvious. The average land cover types from high to low are impermeable water surface, bare soil, cultivated land, green land and water. The maximum temperature difference of the average temperature and the highest temperature of each type was 8.2 鈩，
本文编号：2352582
[Abstract]:The urban heat island problem caused by the urbanization process has become one of the important problems that human beings have to face in the 21st century. Taking Changchun as an example, the relationship between urban heat island effect and surface factors is analyzed by using Landsat8 OLI and TIR data in 2014. Based on the characteristics of Landat8 TIR data, the split-window algorithm is used to retrieve the surface temperature to characterize the urban thermal environment and to analyze its spatial pattern. Based on the "vegetation-impermeable surface-soil" model, the ability of urban impermeable surface and vegetation coverage obtained from the linear spectral mixing model to represent the information of urban artificial buildings and green space was discussed. The results show that there are obvious urban heat island effects in most areas of Changchun, accounting for about 45%, and the most significant areas are located in a large area of continuous distribution of impervious surface lacking vegetation cover. The difference of land surface temperature among different urban land cover types is obvious. The average land cover types from high to low are impermeable water surface, bare soil, cultivated land, green land and water. The maximum temperature difference of the average temperature and the highest temperature of each type was 8.2 鈩，
本文编号：2352582
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