Vicarious Radiometric Calibration of the Hyperspectral Imaging Microsatellites SPARK-01 and -02 over Dunhuang, China

Hao Zhang 1 ID , Bing Zhang 1,2, Zhengchao Chen 1,* and Zhihua Huang 1,3 1 Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, No. 9 Dengzhuang South Road, Beijing 100094, China; [email protected] (H.Z.); [email protected] (B.Z.); [email protected] (Z.H.) 2 University of Chinese Academy of Sciences, No. 19(A) Yuquan Road, Shijingshan District, Beijing 100049, China 3 College of Geoscience and Surveying Engineering, China University of Mining & Technology, No. 11 Xueyuan Road, Haidian District, Beijing 100083, China * Correspondence: [email protected]; Tel.: +86-10-8217-8775; Fax: +86-10-8217-8177