Version 4.14 - #527

Version 4.14

Support for Boule ellipsoids
This version provides support for using Boule ellipsoids in many routines that compute the shape and gravity field of a planet.

Create a grid of a predefined ellipsoid:

grid = pysh.SHGrid.from_ellipsoid(ellipsoid=boule.Mars2009, lmax=100)
grid.plot()

Create an area-weighted histogram of spherical elevations with respect to an ellipsoid:

grid = pysh.datasets.Mars.MOLA_shape().expand()
hist, bin_edges = grid.histogram(ellipsoid=boule.Mars2009)
fig, ax = grid.plot_histogram(ellipsoid=boule.Mars2009, bins=100)

Plot spherical heights with respect to an ellipsoid:

fig, ax = grid.plot(ellipsoid=boule.Mars2009, colorbar='bottom')
figure = grid.plotgmt(ellipsoid=boule.Mars2009, colorbar='right')
figure.show()

Create grids of the spherical gravity vector components, gravity disturbance, and gravity potential on a rotating ellipsoid:

clm = pysh.datasets.Mars.MRO120F()
grids = clm.expand(ellipsoid=boule.Mars2009)
grids.plot()

Create grids of the gravity gradient tensor on a flattened ellipsoid:

grids = clm.tensor(ellipsoid=boule.Mars2009, degree0=True)
grids.plot()

Create a grid of the geoid height with respect to an ellipsoid:

geoid = clm.geoid(boule.Mars2009)
geoid.plot()

Create grids of the magnetic field tensor on a flattened ellipsoid:

glm = pysh.datasets.Mars.Langlais2019()
grids = glm.tensor(ellipsoid=boule.Mars2009)
grids.plot()

Datasets

• Added the PINN2025 magnetic potential model of Mars (Delcourt and Mittelholz 2025).
• Added the CERES gravitational potential model CERES70E (Park et al. 2020).
• Added the lunar gravitational potential model GL1800F (Park et al. 2025).

Other changes

• Fixed title, cb_label, and cb_ylabel strings in plotgmt() to work with pygmt 0.12.
• Minor documentation changes and improvements.
• Fixed an inconsistency with how the (cross-)spectrum is computed when using the option l2norm.
• Fixed a bug where the optional parameter lmax was not treated properly for SHCoeffs.expand() when using GLQ grids with the shtools backend.
• Improved how datasets are downloaded when they have multiple resolutions.
• Minor changes to how the optional parameters lmax and lmax_calc are set when making grids from coefficients that could improve performance under certain circumstances.
• Fixed a bug related to error checking in the python function YilmIndexVector.

Packaging

• Require astropy-base instead of the full astropy package.
• Updated cibuildwheels version and stopped using Mamba.
• Removed the -m64 compiler flag that gives rise to incompatibilites with aarch64 platforms, and which probably is no longer necessary.
• Added a file codemeta.json.

Reference

M. A. Wieczorek, M. Meschede, A. Broquet, T. Brugere, A. Corbin, EricAtORS, K. Hansen, A. Hattori, A. Kalinin, Z. E. Kamal, J. Kohler, D. Kutra, K. Leinweber, P. Lobo, J. Maia, E. Mentzer, D. Minton, I. Oshchepkov, P.-L. Phan, O. Poplawski, M. Reinecke, E. Sales de Andrade, E. Schnetter, S. Schröder, D. Shin, J. Sierra, A. Vasishta, A. Walker, xoviat, B. Xu (2024). SHTOOLS: Version 4.14, Zenodo, doi:10.5281/zenodo.592762.