A tesserioid (spherical prism) in a geocentric coordinate system with a local-North-oriented coordinate system

View of a tesseroid (spherical prism) in a geocentric coordinate system with a local-North-oriented coordinate system on the observation point P.

This figure is used in the Tesseroids (http://tesseroids.leouieda.com) software documentation.

Created using Inkscape (https://inkscape.org).

Other file formats are available in the Github repository (https://github.com/leouieda/tesseroid-figures).