南京城市热场的卫星遥感分析

城市化使得城市数量和规模不断增加，城市作为人类对自然环境改造最为剧烈的部分，具有独特的区域环境，其中城市内部温度显著高于周边郊区的热岛效应是一个突出的城市环境问题，受到了普遍关注和研究。南京市是长江中下游特大城市，城市热岛效应明显，但对其研究很少。利用两个时相的MODIS 31波段数据，生成南京城市亮温场，分析了南京热场的分布、大小，利用亮温场均值、方差和相对温度评价城市热岛强度，并对两个时相城市热场的范围及强度变化进行了分析，取得了较好的效果，认为由于MODIS数据的高时间分辨率和实时免费接收政策使其用来动态监测城市热场是可行的。

A STUDY ON URBAN THERMAL FIELD OF NANJING BASED ON SATELLITE REMOTE SENSING

Urbanlization makes more cities and larger cities. City is the part has been changed by people. City has special regional environment. The heat-island, the inner part of the city temperature higher than the around of the city, is one of the most important city environment problems which was intensively concentrated and studied. Naniing is one of the biggest cities along the Yangtze River. The heat-island of Nanjing is obvious, but it was rarely studied. This paper used two temporal MOIDS band 31 data to make the temperature brightness scene of Nanjing. The area and distribution of heat-island of Nanjing were analyzed based on temperature brightness scene. The average value and standard deviation value of the temperature brightness scene and comparative brightness temperature were used as the index to evaluate the intensity of heat-island of Nanjing. The two temporal temperature brightness scenes were also contrasted, and the differences of the two is obvious. Because the MODIS data has very high temporal resolution and is freely received in real time, it can be used to monitor urban thermal field.