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利用自动气象站观测的长波辐射计算得到的地表温度对MODIS地表温度(LST)产品在青藏高原中部连续多年冻土区的精度进行验证,并利用具有较高空间分辨率的Landsat 5 TM和Landsat 7ETM+反演的地表温度与M ODIS LST产品进行了对比分析.结果表明:白天M ODIS LST产品的平均绝对误差(MAE)和均方根误差(RMSE)分别约为3.42~4.41℃和4.41~5.29℃,夜晚MODIS产品MAE和RMSE分别为2.15~2.90℃和3.05~3.78℃,精度高于白天;M ODIS LST与TM、ETM+反演的地表温度一致性较好,相关系数分别达到0.85和0.95.说明MODIS LST产品在连续多年冻土区的适用性较高,是研究多年冻土地表热状况的一个非常好的数据源.而且,不同空间尺度的遥感数据之间一致性较好,可考虑将多源遥感数据应用于多年冻土热状况监测研究.
The precision of MODIS surface temperature (LST) products in successive permafrost regions in the central Qinghai-Xizang Plateau was verified by using the surface temperature calculated by the longwave radiation observed by automatic weather stations. Landsat 5 TM and Landsat 7 ETM + The results show that the mean absolute error (MAE) and root mean square error (RMSE) of M ODIS LST product during daytime are about 3.42 ~ 4.41 ℃ and 4.41 ~ 5.29 ℃ respectively , Night MODIS products MAE and RMSE were 2.15 ~ 2.90 ℃ and 3.05 ~ 3.78 ℃, the accuracy was higher than that of daytime; the consistency of surface temperature between M ODIS LST and TM and ETM + was good, the correlation coefficient reached 0.85 and 0.95 respectively. MODIS LST products have high applicability in continuous permafrost regions, which is a very good data source for studying the surface thermal status in permafrost regions. Moreover, the consistency between the remote sensing data of different spatial scales is good, Application of Source Remote Sensing Data in Thermal Condition Monitoring of Permafrost.