Conceptualization, D.W.; methodology, D.W.; software, D.W.; validation, D.W.; formal analysis, D.W.; investigation, D.W.; resources, D.W.; data curation, D.W.; writing—original draft preparation, D.W.; writing—review and editing, D.W. and G.Z.; visualization, D.W.; supervision, D.W. and G.Z.; project administration, D.W. and G.Z.; funding acquisition, D.W., G.Z., Q.Z. and X.Z. All authors have read and agreed to the published version of the manuscript. This work was supported by the National Natural Science of China (grant #: 41961065 and 41431179), Guangxi Science and Technology Base and Talent Project (grant #: Guike AD19254002); the Guangxi Innovative Development Grand Program (grant #: Guike-AA18118038 and GuikeAA18242048); the Guangxi Natural Science Foundation for Innovation Re-search Team (grant #: 2019GXNSFGA245001), the Guilin Research and Development Plan Program (grant #: 201902102), the National Key Research and Development Program of China (grant #: 2016YFB0502501), the BaGuiScholars program of Guangxi, and the Open Fund of Guangxi Key Laboratory of Spatial Information and Geomatics (grant #: 19-050-11-13).
