基于Landsat/TM资料研究东莞市地表温度地理分区

以快速城市化的典型地区广东省东莞市为例,以Landsat/TM资料为主要数据源,采用覃志豪单窗算法进行地表温度反演,计算32个区的平均地表温度,并依据各镇区平均地表温度和数字高程模型数据,进行地表温度的地理分区。结果表明:东莞市可划分为山地低温区、河网次低温、丘陵—近河网次高温区、平原高温区4个温度区间,其中山地低温区仅指谢岗镇,河网次低温区位于东莞市西北部东江河网区,丘陵—近河网次高温区包括西南部濒临珠江口的江河冲积平原、东北部的东江河滨及东部的丘陵台地,平原高温区位于中部、南部的平原地区。由此可见,地形地貌对地表温度影响显著,城市化进程必须因地制宜、合理规划。

Geographical Division of Land Surface Temperature in Dongguan City Based on Landsat/TM Data

Taking Dongguan City with typical rapid urbanization in Guangdong as an example,the paper used mono-window algorithm of Qin to retrieve land surface temperature(LST) from Landsat/TM data.The average temperatures of 32 township districts were got from the LST subset extracted with the bound of 32 township districts.And the geographical division of LST in Dongguan City was studied according to the average LST of each town and the digital elevation model data.The result showed that the LST in Dongguan City can be divided into 4 zones: hill zone with low temperature,river networks inferior zone with low temperature,foothill or near-river-networks inferior zone with high temperature,and plain zone with high temperature.The hill zone with low temperature just included Xiegang Town.The river networks inferior zone with low temperature was located in Dongjiang River networks which were in the northwest.The foothill or near-river-networks inferior zone with high temperature included the alluvial plain in the southwest,the Dongjing River riverside in the northeast,and the foothill platform in the east.The plain zone with high temperature was located in the central and southern plain region.So LST was affected significantly by landscape,and the rational city planning should be based on the local geographic conditions.