Generalization of OrthogonalSphericalShellGrid to be able to construct any grid with coords-metrics that vary in both i, j

[navidcy]

This PR removes any conformal mapping-related properties from the OrthogonalSphericalShellGrid and thus now OrthogonalSphericalShellGrid is any grid with coordinates and metrics that depend on both horizontal dimensions. The PR also adds a conformal_cubed_sphere_panel constructor that returns the grid that corresponds to each panel of a conformal cubed sphere grid.

Closes #3200

[glwagner]

Maybe show us what the syntax would look like to construct a lat lon grid? or a lat lon grid with a displaced pole?

[navidcy]

I’ll add an example in the docstring.

[glwagner]

and paste here?

[navidcy]

and paste here?
For sure

[navidcy]

Maybe show us what the syntax would look like to construct a lat lon grid? or a lat lon grid with a displaced pole?

OK, so what you are asking here implicitly is that this PR also deals (at least partly) with #3205?
Because as it stands now, there is no convenience constructor to create a lat-lon OrthogonalSphericalShellGrid; you can just create it using the struct constructor. Is this what you'd like to see an example of? It will involve manually creating the arrays with the lat, lon values and the metrics and then provide it to the OrthogonalSphericalShellGrid constructor.

[navidcy]

I think I'd rather deal with #3205 in a different PR.

[glwagner]

Oh no problem. I think there could even be more than one PR. First we just want to show that we can build a latitude longitude grid using OSSG. next we can test dynamics on OSSG and make sure its identical (that's a better test than just visualizing a splash). Then we can design a user interface that makes it easy to build latitdue longitude grid or any other grid on OSSG. Then we can deprecate latitude longitude grid. So there's a lot of ways to break it up. I just thought if OSSG works it'd be nice to demonstrate by running a case on lat lon grid.

[navidcy]

I'll do that on a new PR! I'm merging this which is mostly name-change for the constructor and some sorting of conformal mapping related properties together to make OSSG grid more generic.

[navidcy]

(Well I guess I'll merge after somebody approves... hint hint)