基于MODIS数据的陕西省地表温度时空分布特征研究

his paper is mainly on analyzing the temporal and spatial distribution characteristics of Land Surface Temperature (LST) in Shaanxi province using MODIS/LST time series data from 2001 to 2011. The results show that the LSTs are relatively stable in most areas of Shaanxi province in the past 11 years. The yearly average values of LST in Shaanbei are larger than those in Guanzhong plain, and the values in Shaannan are the smallest. In the three areas, the inner-annual variations of LSTs in Shaanbei are much stronger that those in Quanzhong and Shaanan, and the variations of LST appear obvious seasonal differences during the past years. The values of LSTs are highest in summer, lowest in winter, and are similar in spring and autumn, meanwhile, and the value of LSTs reach their maximum in June. In spatial distribution, the annual changes of average LSTs increase gradually from south to north. The changes of LST are significant in Shaanbei, and are steady in Guanzhong and Shaannan. Meanwhile, the variations of LST in a year are different. The LSTs decrease gradually from south to north in the period of winter, but those in the other periods are opposite. All these temperature characteristics are affected by climate, topography, land surface coverage types and urban heat island effect factors.