基于Landsat TM图像的北京城市地表温度遥感反演研究

Urban Land Surface Temperature Retrieval Based on Landsat TM Remote Sensing Images in Beijing

利用北京地区LandsatTM热红外波段数据,采用单通道算法反演得到北京地区地面温度分布图。从反演结果可以看出,北京城区地面温度比郊区地表温度高,郊区地表温度较低,密云水库、官厅水库等水体的温度最低,总体上北京城市热岛效应显著。地表比辐射率是通过Van经验公式反演得到,通过对比分析,表明该方法对自然地表的比辐射率反演效果较好。

In this paper, urban land surface temperatures (LST) were retrieved by single-channel algorithm based on the 6th band(thermal infrared band) of Landsat TM remote sensing images in Beijing and the LST distribution maps were accomplished according to the retrieval results. The results indicated that the LST of urban center is higher than that of suburb area, the temperature of water is the lowest such as Miyun and Guanting reservoirs, so it is clearly proved that there are the obvious UHI effects in Beijing. In addition, land surface emissivity was retrieved from Van empirical formula and the results represented that there is the better accuracy of emissivity retrieval for natural land surface comparing with other underlying ones.