[PROJ] Interrupted meta-projection

[Javier Jimenez Shaw]

After chatting with Daan Strebe, I have implemented a "meta" projection in
PROJ called "interrupted". It just take a parameter for the base projection
and another for the definition of the gores. It is working for "tmerc",
"sinu", "cass" and "poly". (and it would be easy to add more).

Does anybody find it useful? I remember people asking how to make gores
with QGIS.

Cheers
Javier.

On Tue, 1 Apr 2025 at 17:54, Javier Jimenez Shaw <j1 at jimenezshaw.com> wrote:

> Hi
>
> I was looking for the Sinusoidal interrupted projection in PROJ (and later
> QGIS)
>
> https://en.wikipedia.org/wiki/Sinusoidal_projection#/media/File:Usgs_map_sinousidal_equal_area.PNG
> But I haven't found it. Am I wrong?
>
> What I found is
> https://proj.org/en/stable/operations/projections/sinu.html, that is not
> interrupted.
>
> In case it is not there, would it be worth it to add it? See that this is
> one type of projection used to print the covering of a 3D globe.
>
> Cheers
> Javier.
>
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