Research on the Spatio-temporal Coding Scheme for the Dynamic Earth’s Magnetosphere

The spatio-temporal subdivision model for the dynamic Earth’s magnetosphere is proposed to realize the multi-layered subdivision for the dynamic and irregular physical space of the magnetosphere drawing on the idea of the global discrete grids for the geoscience data. The distortion of the grids can be convergent within a certain number of subdivision times. Therefore, the subdivision model can be taken as a formalization for the spatio-temporal characteristics of the Earth’s magnetosphere in a certain range. On this basis, encoding and expressing the spatio-temporal grids obtained by subdivision for computer storage and processing is another key problem in constructing the basic spatio-temporal framework for the organization and management of large-scale observation data of the Earth’s magnetosphere. Due to the specific spatio-temporal characteristics, the classical geoscience coding schemes have trouble in fully reflecting the spatio-temporal relations between the grids. Therefore, it is difficult to support the basic spatio-temporal computing between the grids. In this paper, an efficient coding scheme is designed for the drift shell subdivision grids combining the basic ideas of the integral coordinate coding and the Morton coding schemes. On this basis, the spatio-temporal framework for the dynamic Earth’s magnetosphere is constructed which lays the foundation for the efficient organization and processing of geomagnetic data. The experiments carried out show that, the coding efficiency of the scheme is relatively high and it can support efficient neighbor relationship calculation. It provides a solution for the organization and computing of the multi-source, multi-layered, heterogeneous and large-scale observation data of the dynamic Earth’s magnetosphere.