[mapserver-users] One table with multiple GeometryColumns

[Jiří Kadlec]

Hi Thomas,
Thanks for explanation but it's still a bit unclear. I tried to study the
manual on http://mapserver.org/mapfile/projection.html.
Can I define two or more PROJECTION blocks for one LAYER?

What I'm trying to achieve is something like this: In the GetCapabilities
document, the client will see the list of supported projections for each
layer. Something like:

<Layer>
<Name>cryosphere_atlas_north</Name>
<Title>Atlas of the Cryosphere: Northern Hemisphere</Title>
<SRS>EPSG:32661</SRS><SRS>EPSG:4326</SRS><SRS>EPSG:3408</SRS><SRS>EPSG:3410</SRS><SRS>EPSG:3411</SRS><SRS>EPSG:3413</SRS><SRS>EPSG:3571</SRS>
......

--Jiri


On Mon, Jan 27, 2014 at 12:48 PM, Thomas Bonfort
<thomas.bonfort at gmail.com>wrote:

> (please keep your messages on list)
>
> yes, it will do that if proj support is built in. Just make sure you
> have defined a PROJECTION block at the LAYER level describing the
> projection of the underlying data.
>
> --
> thomas
>
> On 27/01/2014 11:45, Jiří Kadlec wrote:
> > Thank you for the clarification.
> > I have a related question:
> >
> > Can MapServer do 'on-the-fly' reprojection of my WMS layer data on the
> > server?
> > Let's say I have a table 'lakes' with one geometry column in EPSG:4326.
> And
> > I want to make the same layer available in 3 other projections and I
> don't
> > mind the reprojection overhead.
> >
> > Regards,
> > Jiri
> >
> >
> > On Mon, Jan 27, 2014 at 12:38 PM, Thomas Bonfort
> > <thomas.bonfort at gmail.com>wrote:
> >
> >> AFAIK, creating 3 distinct layers is currently the only solution
> >> available, which has the inconvenience that the client must explicitely
> >> request the correct layer in order to avoid the overhead of
> reprojection.
> >> You can use INCLUDEs inside those layers in order to avoid duplicating
> >> the rest of the LAYER configuration (i.e. for everything except NAME,
> >> DATA, PROJECTION).
> >> The mechanism used for
> >> http://mapserver.org/fr/development/rfc/ms-rfc-86.html SCALETOKENs
> could
> >> probably be extended to include other runtime-replaceable tokens
> >> (notably projection id), but there would still be issues in that case as
> >> to how mapserver itself should be instructed whether to reproject the
> >> data or not.
> >>
> >> --
> >> thomas
> >>
> >> On 27/01/2014 11:28, Jiří Kadlec wrote:
> >>> Dear mapserver forum,
> >>>
> >>> In my PostGIS database I have a table 'lakes' with 3 geometry columns:
> >>> the_geom4326, the_geom3857, the_geom3067
> >>> My goal is to make my 'lakes' layer available in the 3 different
> >>> projections: (EPSG:4326, EPSG:3857, EPSG:3067)
> >>>
> >>> Is this possible in MapServer?
> >>>
> >>> (then only way I managed so far is to serve the table as 3 different
> >>> layers, first layer in EPSG:4326, second layer in EPSG:3857, third
> layer
> >> in
> >>> EPSG:3067)
> >>>
> >>>
> >>> Thanks a lot for help,
> >>>
> >>>
> >>>
> >>> _______________________________________________
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> >>> mapserver-users at lists.osgeo.org
> >>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
> >>>
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> >
> >
> >
> >
>



-- 
Jiří Kadlec
Research Assistant
Aalto university
Lahti, Finland
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