Funding for this research was provided by:
National Natural Science Foundation of China (41672325, 41602334)
National Key Research and Development Program of China (2017YFC0601505)
Key R & D projects of Sichuan Science and Technology Department of China (2021YFG0257)
Opening Fund of Geomathematics Key Laboratory of Sichuan Province (SCSXDZ201709)
Article History
Received: 6 March 2020
Accepted: 1 February 2021
First Online: 26 February 2021