Funding for this research was provided by:
National Natural Science Foundation of China (61806022)
State Key Laboratory of Geo-Information Engineering (SKLGIE2018-M-3-4)
Fundamental Research Funds for the Central Universities, CHD (300102269103, 300102269304, 300102269205)
National Key R&D Program of China (2019YFA0405501)
Article History
Received: 7 May 2020
Accepted: 28 January 2021
First Online: 4 February 2021
Conflict of Interest
: The authors declare that they have no conflict of interest. This article does not contain any studies with human participants or animals performed by any of the authors. Informed consent was obtained from all individual participants included in the study.