Scientific Computing Platform for Geophysical Geodesy

The scientific computing platform for geophysical geodesy comprises two core modules: the Precise Approximation of Earth Gravity Field and Geoid (PAGravf4.5) and the Earth Tide, Load Effect and Deformation Monitoring Computation (ETideLoad4.5). These systems were independently developed over a decade by ZHANG Chuanyin of the Chinese Academy of Surveying and Mapping, representing the culmination of his twenty years of pioneering research in this field. The platform and its core source codes were officially open-sourced and made freely accessible to the global community in September 2021.

This initiative aims to address the critical scarcity of such computational resources in global geoscience education. It seeks to establish a cognitive framework and knowledge architecture for multi-source heterogeneous data fusion and collaborative geodetic technologies, thereby demonstrating the intrinsic scientific elegance and potential of the discipline. Ultimately, this endeavor catalyzes a strategic paradigm shift: evolving geodesy from a "descriptive measurement tool" into a "dynamic Earth system analyzer," and elevating geodetic education from a "technology-oriented" approach to a "problem-driven" philosophy.

✍ Multi-type data from terrestrial, maritime, aerial, or space-based observations

✍ Diverse Terrain Effects on Various gravity field Elements on or outside the Geoid

✍ Closed-Loop Analytical Operations between External Gravity Field Elements

✍ All-Element Analytical Modeling of Local Gravity Field in Full External Space

✍ Observation Error Assessment & Precise Computational Performance Control

✍ Gravity Exploration Modeling from Multi-Source Heterogeneous Observations

✍ Analytically geodetic and geodynamic algorithms with unified standards and coordinated geophysical models

✍ IERS conventions (2010) compliant and improved, with clarified concepts and fully derived and verified algorithms

✍ Uniform computation of tidal, polar shift, and COM variation effects on full-space various geodetic elements

✍ Analytical computation of surface load effects and collaborative monitoring of temporal Local gravity field

✍ Geodetic Estimation of Terrestrial Water EWH and Computation of spatiotemporal ground stability variations

The two software packages were developed by QT C++ (Visual C++) for the user interface, Intel Fortran (Fortran90, 132 Columns fixed format) for the core function modules, and mathGL C++ for the geodetic data file visualization in the Visual Studio 2017 x64 integrated environment. PAGravf4.5 is composed of nearly 50 win64 executable programs with more than 500 function modules, and ETideLoad4.5 is composed of more than 50 win64 executable programs with nearly 600 function modules.

The scientific computing platform is suitable senior undergraduates, graduate students, scientific researchers, and engineering technicians in geodesy and geophysics, geology and geoscience, geomatics and geographic information, seismic and geodynamics, aerospace and satellite dynamics. You can design your own schemes and processes, then organize flexibly the related programs and functions, perform the scientific computations for geophycical geodesy.

There are the example files saved in the folder C:\PAGravf4.5_win64en\examples and C:\ETideLoad4.5_win64en\examples for each Win64 program, espectively. Each example includes the operation process file process.txt, some input-output data files and screenshots. The folder name of the example files is the same as the name of the window executable program.

Before the program to be used, it is recommended to run the program from the input-output example data files with comparing the screenshots and the process information in process.txt. It will take about 7 working days to complete all the example exercises for PAGravf4.5 or ETideLoad4.5. Thereafter, you can use the scientific computing platform alone.