本文利用天宫一号获取的具有高空间分辨率的红外谱段数据,选择黑河中游作为反演区域,基于辐射传输模型和Planck定律进行地表温度反演.影像的反演结果表明使用天宫一号高空间分辨率的红外谱段反演得到的地表温度能更细致合理的刻画地表温度分布,这对地表温度异质性的研究具有重要意义.为了进一步验证反演精度,本文依托黑河流域已有观测平台和系统,选取黑河中游8个典型下垫面作为验证场地,开展地面同步观测实验.实验结果表明通过反演获得的地表温度与地面实测数据的平均偏差为-0.375℃,这也说明本文的反演过程能够较为精确的使用天宫一号红外谱段反演地表温度.

In this paper, the high-spatial-resolution thermal infrared domain data from the Tiangong-1 satellite were used to retrieve the Land Surface Temperature (LST) based on the radiative transfer model and Plank's law. The Heihe River Basin was selected as the study area. The retrieving process was supported by the numerous ground-based measurements from the Heihe Watershed Allied Telemetry Experimental Research (HiWATER) project implemented in the midstream of this basin. The retrieval results were available and reasonable to describe the distribution of LST in detail, which was most significant for assessing the heterogeneity of LST. To validate the retrieval results, the eight sub experimental regions with different landscapes were selected to carry out the LST ground-based observations synchronized with the Tiangong-1 satellite. The validations results showed that the retrieval LSTs fit well with ground-based LSTs, and were with a bias of -0.375℃. Additionally, the results demonstrated that the retrieval processes proposed in this paper were applicable for the Tiangong-1 satellite to retrieve the accurate LSTs.