[Qgis-user] Non Earth projection (Alex Mandel)

[Carlo A. Bertelli (Charta s.r.l.)]

Hello Alex,
you took the question too seriously, "Non Earth" is MapInfo parlance for "I
dunna 'but it" or "My user and I do not care about CRS". Nothing to do with
the moon and the stars, sometimes a space which is not georeferenced (your
cellar and bottles, a library with books, etc.).
Sometimes this is just related to "paper coordinates" (pixels are not so
bad as a unit) or unknown CRSs (better nothing than wrong).
Anyway the solution could be from very easy to very difficult. Frequently
the user has a way to recognize the right CRS or infer it by
time/place/numbers or simply reading what's written on the original (I
know, reading the map is more than reading the words in it, but this is a
good start...), sometimes it's just a matter of affine transformations
(there is a plugin for this, sometimes the map has to be georeferenced
again. In these cases there is a plugin to georeference vectors (MapBender,
if I remember, I write on my mobile).
If Priscilla tells us more about what type of non-earth-projection are
these, we could be more helpful.
c

On Tue, 30 Sep 2014 09:06:40 -0700 Alex Mandel wrote:
> From: Alex Mandel <tech_dev at wildintellect.com>
> To: Priscilla Maisie <adwoa.maisie at gmail.com>,
>         qgis-user at lists.osgeo.org
> Subject: Re: [Qgis-user] Non Earth projection
> Message-ID: <542AD510.2070808 at wildintellect.com>
> Content-Type: text/plain; charset=windows-1252
>
> On 09/30/2014 03:10 AM, Priscilla Maisie wrote:
> > Hi,
> > I need to work in a non earth map projection system. Can't locate the
> > option on qgis. Is there a way I can create this?
> >
> > Regards,
> > Priscilla
> >
>
> Yes you can create your own projection in Settings->Custom CRS.
> You'll need to create your own proj4 compatible string. Comparing a few
> similar projections should help you figure out what you need.
>
> Note in recent versions of QGIS if you look in the Projection on the Fly
> dialog, there are several Mars projections and Coordinate systems.
>
> Need more help, please provide more information about the planet
> size/shape and type of projection.
>
> Other references, http://epsg.io and http://spatialreference.org
>
> Thanks,
> Alex
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