APPLIED GEOPHYSICS     2024 21 (1):  31-40    ISSN: 1672-7975  CN: 11-5212/O 3D modeling of different areas of China based on the 3D Surface Spline model Feng Yan*, Huang Ya, Li Yijun, Zhang Jinyuan, and Liu Shuang 1. School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing 210044, China. 2. State Key Laboratory of Lunar and Planetary Sciences (Macau University of Science and Technology), Macau 999078, China. 3. State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190, China Received: null  Revised: null  Online: null Supporting info