利用MODIS热红外数据进行广州市夏季热场分析

城市热环境及其热效应是当前城市气候与环境中最为重要的研究内容之一。地表温度（LST）是研究热环境的一个有效手段。相比在我国进行LST研究中广泛使用的AVHRR数据,MODIS数据具有更高的灵敏度和精确度，基于2004年夏季MODIS热红外数据进行广州市城市LST反演，并对LST进行密度分割处理制作城市热场分布图。通过对不同时间LST图像进行对比以及数据统计采分析广州市热环境的空间分布格局。发现广州市城市热岛效应问题极为严重。

A Study of Thermal Field in Summer of Guangzhou by MODIS Thermal Infrared Data

The thermal environment and thermal effect is one of the most important research contents in city climate and environment. Land surface temperature (LST) is one of the most important ways to research thermal environmental problem of earth surface. Contrast with AVHRR which was widely used to retrieve LST in china MODIS is more sensitive and accurate. In this paper, the retrieval means of LST was expounded, and LST of Guangzhou city was retrieved using MODIS split windows algorithm of NASA on the base of cloudless MODIS thermal infrared data which was collected in summer of 2004. The distribution image of urban thermal field was executed after the density slice was applied to LST. Through contrasting different seasonal LST Images and statistic value, the spatial pattern of thermal environment was analyzed in detail. From the distribution image can shows that the center of thermal fields is consistent with layout of city and type of surface features, also from the contour and temperature value can find out that the temperature difference between urban and suburb was thundering evident, which has almost reached at 3~4℃. The research result shows that Urban heat island effect is very serious in Guangzhou city.