运用EOS／MODIS资料对银川城市热场的遥感分析

采用一种基于MODIS遥感资料和地面自动气象站(AWS)观测数据反演地表温度(LST)的统计方法,得出银川市四季各典型月份晴空地表的热场在季节、空间上的二维分布;通过对热场强度的研究,得出银川主城区夏季存在明显"热岛"效应,冬季存在明显"冷岛"效应的初步分析结果;通过对LST与植被指数间的关系分析研究得出:银川植被生长季LST与归一化植被指数呈负相关关系,且线性关系明显,R2值可达0.7。另外,反演结果还显示了贺兰山东麓山前在夏季,存在明显的高温区,结合对植被指数的分布研究,表明这里植被少,覆盖度低,下垫面主要以砾石为主。

Remote sensing analysis on Yinchuan city thermal by using EOS/MODIS data

Using a statistical methods inversing surface temperature(LST) on the basis of remote sensing data and ground-based automatic weather station(AWS) data,two-dimensional space distribution of the thermal in the clear sky surface for the typical four seasons in Yinchuan city was gotten.The study of thermal strength indicated that there was an obvious "heat island" effect in summer and obvious "cold island" effect in winter for the main city of Yinchuan.There was a significant was negative correlation between LST and vegetation index with correlation coefficient of 0.7.In addition,the inversion results also showed that there is an obvious area of high temperatures on the east of Helan Mountain.According to distribution of vegetation index,the area had less vegetation coverage and mainly gravel-based surface.