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分析了影响MODIS地表温度产品精度的主要因素,并对这些因素综合作用下的MODIS地表温度产品的精度验证方法进行了回顾和比较。针对MODIS地表温度产品在干旱半干旱地区误差偏大的状况,以黑河流域为例,对MODIS地表温度产品进行了验证。用于验证的地面观测数据包括自动气象站红外辐射温度计数据和长波辐射数据。这里结合具体的地表情况比较了两种验证方法的优劣,结果表明:使用长时间的夜间长波辐射数据验证MODIS地表温度产品更合理;黑河流域的MODIS地表温度产品的平均绝对偏差小于2.2℃。
The main factors influencing the precision of surface temperature of MODIS are analyzed. The accuracy verification methods of MODIS surface temperature products under the combined action of these factors are reviewed and compared. In view of the large error of MODIS surface temperature products in arid and semi-arid areas, taking the Heihe River Basin as an example, the MODIS surface temperature products were verified. Ground observations for validation include automatic weather station infrared radiation thermometer data and long-wave radiation data. The results show that it is more reasonable to validate MODIS surface temperature using long-term nighttime longwave radiation data. The average absolute deviation of MODIS surface temperature in Heihe River Basin is less than 2.2 ℃.