On Fri, Jan 9, 2015 at 11:43 AM, Schafer, Simon (UK) <
[email protected]> wrote:
> Good morning all.
>
> I am new here and am after some advice. I presume this is the correct
> place to ask.
>
>
> I am using GeoServer (2.5.1) to make WMS calls and I want the map in a
> gnomonic projection.
> If I understand the WMS specification correctly (06-042) I need to use the
> AUTO (AUTO2) namespace
> for CRS "for a class of CRSs that include a user-selected centre of
> projection".
>
Correct
> As the specification and the GeoTools code only contains a handful of
> projections
> I assume I need to make changes to the code to include a new projection.
> So I have made changes to the gt-referencing module, added a new AUTO
> Factlet,
> added a new Gnomonic projection and have got something working.
>
> I now have two questions (one a bit general and one specific to GeoTools)
>
> 1. Is this the correct way of getting a WMS with a gnomonic projection?
> I cannot see any other mechanism but the WMS specification seems a
> bit specific having
> just 5 projections rather than a mechanism for passing parameters
> into a projection.
>
The other way would be to create a EPSG code, but if you need the center of
it to be
user provided, the AUTO projections are the right path
>
> 2. Should these code changes be submitted as a patch?
> I have added a new AUTO namespace with an arbitrary code. This seems
> like a useful addition
> but is not included in the WMS (1.1.1 or 1.3.0) specification.
>
A pull request, with tests, please :)
About the code, we need to make sure the code won't end up conflicting with
the OGC ones.
If this was EPSG we could just pick a code > 100000, but I'm not sure which
policy OGC
used to pick the auto projection codes...
Cheers
Andrea
--
==
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