[PROJ] Equirectangular/Equidistant Cylindrical

[Andrew Patterson]

Even,

I can still post an issue for that then. I'll do that shortly!

On Thu, Oct 13, 2022 at 9:38 AM Even Rouault <even.rouault at spatialys.com>
wrote:

> Access to the PDF to try spotting the cause of the
> "proj_create_from_database: crs not found" error & possibly solving it
> would still be interesting
>
> Le 13/10/2022 à 15:31, Andrew Patterson a écrit :
> > Even,
> >
> > So while I was writing up the issue I realized I could probably
> > provide some simple code to help illustrate the problem, so I wrote
> > some. Then I realized I should really run it in our old app as well,
> > which took a while -- which is why you're reading this today rather
> > than yesterday. But in the course of doing this, I basically proved
> > that PROJ is fine, so there's no reason to create the issue. So false
> > alarm!
> >
> > Plotting on the maps is a two step process; coordinate transform via
> > PROJ from WGS84 to the map's projection, then run that coordinate
> > through a world-to-page (i.e. pixel) transform. The latter is *really*
> > easy to test so that's always the first thing I verify. Once that's
> > been done, the problem basically has to lie with the PROJ transform --
> > and this has been true until now. I'm actually quite perplexed. If
> > both parts of a two-part transformation are fine, why is everything
> > shifted? Something is hinky, but that's my problem not yours, so I
> > apologize for wasting your time with this. I think I also jumped the
> > gun because of problems with Equidistant Cylindrical in the past, but
> > for once, that project is innocent.
> >
> > Again, sorry for the trouble!
> >
> --
> http://www.spatialys.com
> My software is free, but my time generally not.
>
>

-- 
..............................
Andrew Patterson
Lead Software Architect
Avenza Systems Inc.

email: andrew at avenza.com
phone: 416.487.5116
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