Gallery plots for each projection

Description of the desired feature

The user documentation contains a gallery of projections available. The plots showcase the projection so it’s easy to choose which one you want (by clicking an image instead of having to google the name). We need to fill out this gallery with all projections listed in https://www.generic-mapping-tools.org/gmt/latest/proj_codes_GMT.html

To make a gallery plot, place a script that generates the figure in examples/projections and sphinx-gallery will take care of the rest. The file must have a specific format (see the other examples). Ideally, each projection should show a case in which it’s ideal (e.g. not using Mercator for high latitudes).

Any help with this is greatly appreciated! We can build this out slowly, one example at a time.

[willschlitzer]

I prefer them as well. My thought is to copy the GMT example projection maps when able, as I think they are all good maps and there’s no need to reinvent the wheel. I just want to make sure there isn’t a plan in place already for standardized example projection maps.

[seisman]

I don’t want to plagiarize, but I would also hope to avoid reinventing the wheel if possible.

PyGMT and GMT belong to the same organization, so don’t worry about plagiarization. We can just copy and paste from the cookbook, and even improve it if someone has more knowledge more about projections.

Again, it would be good if @willschlitzer can open a new issue for your comment https://github.com/GenericMappingTools/pygmt/issues/292#issuecomment-742367645, and @phloose for your comment https://github.com/GenericMappingTools/pygmt/issues/292#issuecomment-747743344, as I don’t want to make the discussions too long in this issue.