[mapserver-users] One table with multiple GeometryColumns

[Jiří Kadlec]

OK,
I think I understand it now. So I just need to define the list of available
projections at the MAP level.
Then, MapServer will automatically take care of the reprojection.

I'll do this as a first step, and then I'll try the 'variable substitution'
trick suggested by Martin in case the on-the-fly reprojection is too slow.

-Jiří


On Mon, Jan 27, 2014 at 1:02 PM, Thomas Bonfort <thomas.bonfort at gmail.com>wrote:

> the list of available projections is defined for all layers of the
> mapfile, not at the individual <Layer> level. they are set with the
> wms_srs metadata entry.
>
> On 27/01/2014 11:57, Jiří Kadlec wrote:
> > 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,
> >>>>>
> >>>>>
> >>>>>
> >>>>> _______________________________________________
> >>>>> mapserver-users mailing list
> >>>>> mapserver-users at lists.osgeo.org
> >>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
> >>>>>
> >>>> _______________________________________________
> >>>> mapserver-users mailing list
> >>>> mapserver-users at lists.osgeo.org
> >>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
> >>>
> >>>
> >>>
> >>>
> >>
> >
> >
> >
>



-- 
Jiří Kadlec
Research Assistant
Aalto university
Lahti, Finland
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