Dan Qiao, Juntao Yang, College of Geodesy and Geomatics, Shandong University of Science and Technology, China; Bo Bai, Guowei Li, Jianguo Wang, Institute of Crop Germplasm Resources, Shandong Academy of Agricultural Sciences, China; Zhenhai Li, College of Geodesy and Geomatics, Shandong University of Science and Technology, China; Jincheng Liu, College of Natural Resources and Environment, Northwest A&F University, China; Jiayin Liu, College of Geodesy and Geomatics, Shandong University of Science and Technology, China