Scientific Computation Platform for Geophysical Geodesy

Integrated nearly 20 years of geodetic research results, the large scientific computing window platform for geophysical geodesy have been independently developed by Chinese Academy of Surveying and Mapping, which is composed of PAGravf4.5 (Precise approach of Earth gravity field and geoid) and ETideLoad4.5 (Earth tide, load effects and deformation monitoring computation). Based on the purpose of public welfare, the scientific computing platform is committed to improving the scientific research and higher education environment lacking in such computing resources in the geoscience field, showing the attractive potential of geodesy, reconstructing the heterogeneous geodetic system and collaborative geodetic frame, improving the geodetic ability in solving practical problem by multi-disciplinary collaboration, and supporting the deep fusion of heterogeneous Earth observations and collaborative monitoring of multi-geotechnologies.

Precise Approach of Earth Gravity Field and Geoid (PAGravf4.5) is a large scientific computation software package according to stationary gravity field theory. Which constructs the unified analytical algorithm system of various terrain effects on various types of gravity field elements outside the geoid to improve the geophysical gravity exploration and gravity field data processing. Sets up the complete gravity field approach algorithm system according to the geodetic boundary value theory to realize the full elements modeling of gravity field and 1cm accuracy of geoid. Develops some ingenious algorithms according to physical geodesy to optimize regional height datum, and then expand the geodetic application from gravity field method and data.

PAGravf4.5 has a strong analysis ability on various physical geodetic issues and can directly measure the external accuracy of gravity field observations. You can call the programs to verify the performances of the relative algorithms and nature of gravity field from the observation situations to design high-performance solutions in advance, and then calculate various terrain effects, fuse heterogeneous observations, model full elements of gravity field and land-sea geoid, and refine regional height datum.

Earth Tide, Load Effects and Deformation Monitoring Computation (ETideLoad4.5) is a large scientific computing package for geophysical geodetic monitoring, which adopts the scientific uniform numerical standards and analytic compatible geophysical algorithms accurately to compute various tidal and non-tidal effects on various geodetic variations outside the solid Earth, approaches the load deformation field and temporal gravity field from heterogeneous geodetic data, and then quantitatively monitors the land water, geological environment and ground stability variations, in order to support the deep fusion of heterogeneous geodetic data and collaborative monitoring of multi-geodetic technologies.

You can design your own schemes and processes, then organize flexibly the related programs and functions from ETideLoad4.5, perform some scientific computations for various tidal or non-tidal effects, ground deformation field or temporal gravity field approach, land water, ground stability, or surface dynamic environment monitoring, and multi-source heterogeneous geodetic data deep fusion.

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 5 working days to complete all the example exercises for PAGravf4.5 or ETideLoad4.5. Thereafter, you can use the scientific computing platform alone.

✍ Classroom Teaching, ✍ Self-Exercise, ✍ Science Research and ✍ Engineer Computing

PAGravf4.5 structure of computation functions
ETideLoad4.5 structure of computation functions