Software

This is a C program for calculating integrals over the reduced latitude for the tensor (tangential-tangential, tangential-shear, tangential-dilation, tangential-normal, and normal-normal) ellipsoidal harmonics. More details can be found in the following publication:

Šprlák M (2023) Comments and corrections to: "Ellipsoidal spectral properties of the Earth's gravitational potential and its first and second derivatives" by Blling and Grafarend (2005) in J. Geod. 79(6-7):300-330. Journal of Geodesy, (submitted).

To access the program, click here: Tensor_Ellipsoidal_Harmonics.

This is a collection of FORTRAN source codes and bash scripts to perform rigorous forward modelling of the gravitational potential spectra. See more details in the following publication:

Šprlák M, Han S-C, Featherstone W (2018) Forward Modelling of Global Gravity Fields with 3D Density Structures and an Application to the High-Resolution (~2 km) Gravity Fields of the Moon. Journal of Geodesy, 92(8), pp. 847-862, https://doi.org/10.1007/s00190-017-1098-7.

To access the Gravtess directory click here: Gravtess.

This is my first graphical user interface program. It was developed in the programming language C using GTK+ libraries. Normal_tensor computes the components of the normal gravitational tensor and it allows:

 - evaluation of the normal gravitational tensor defined in the geocentric spherical, geocentric Cartesian and local north-oriented reference frames,

 - evaluation in a regular grid or at arbitrarily distributed points,

 - evaluation by using the defining parameters of GRS67, GRS80, WGS72 and WGS84 reference ellipsoids.

See more details about the program in the following publication:

Šprlák M (2012) A Graphical User Interface Application for Evaluation of the Gravitational Tensor Components Generated by a Level Ellipsoid of Revolution. Computers & Geosciences, 46, pp. 77-83, https://doi.org/10.1016/j.cageo.2012.04.013.

A) For those having no troubles with GTK+ libraries the Normal_tensor program with graphical user interface is available here:

Windows self-installing package: Normal_tensor_v01_win32.exe

Linux rpm package: Normal_tensor_v01_i386.rpm

Important!!! In Windows, run the program using an icon on your desktop or in the main menu. In Linux, run the program by typing the command Normal_tensor in a command line.

B) For those having troubles with GTK+ libraries version of the Normal_tensor program without any graphical user interface is available here:

Windows self-installing package: Normal_tensor_nogui_v01_win32.exe

Linux rpm package: Normal_tensor_nogui_v01_i386.rpm

Important!!! After installing these packages, you can start the program by typing the command Normal_tensor_nogui in a command line.

Report problems (bugs, installation, etc.) may be found here:

bugs_02112012.pdf

GRAFIM (GRAvity FIeld Modelling) is a collection of source codes for the purposes of Earth's gravity field modelling by spherical harmonics. All source codes have been written in the programming language C and allow:

 - evaluation of the disturbing gravitational potential, gravity anomaly, gravity disturbance, geoid undulation, deflections of the vertical, second-order disturbing tensor components,

 - evaluation in a regular grid or at arbitrarily distributed points,

 - evaluation in space above reference ellipsoid or sphere,

 - evaluation up to ultra-high degree and order spherical harmonic expansions, 

 - only GRS80 reference ellipsoid is considered.

Here, I only make available one particular program from the GRAFIM collection. This particular program allows computing the second-order disturbing tensor components in the local north-oriented reference frame. Manual, executable for Windows, and Linux rpm package are available here:   manual_v1.2.pdf    grafim_ui.exe   grafim_ui_v01_i386.rpm

Stuba soft is another collection of source codes in the programming language C for the purposes of geoid/quasigeoid determination. Stuba soft allows:

 - evaluation of the Stokes and Hotine integrals by numerical integration and one-dimensional fast Fourier transform,

 - evaluation by deterministic modifications of the Stokes and Hotine kernels,

 - evaluation of the distant zones by spherical harmonics according to the deterministic modification of the integral kernel.