[Mapserver-users] cascading map server

[Tom.Kralidis at CCRS.NRCan.gc.ca]

> -----Original Message-----
> From: Doyon, Jean-Francois 
> Sent: Thursday, March 27, 2003 11:35 AM
> To: Kralidis, Tom; 'bart.van.den.eijnden at geodan.nl';
> 'mapserver-users at lists.gis.umn.edu'
> Subject: RE: [Mapserver-users] cascading map server
> 
> 
> Tom,
> 
> Heh, good question! I know that right now, you have to 
> specifiy all the remote layers one by one, there's no way for 
> MapServer to simply ingest a remote GetCapabilities and just 
> figure it out on it's own ( Bugzilla -> feature enhancement ).
> 

I will file an enhancement.

> But this begs the question (I probably once knew the wanswer 
> but I forget), when one does a GetCapabilities to a MapServer 
> that has remote layers in it, does it re-fetch the remote 
> GetCapabilities everytime ??? There's another one for the 
> featur enhancement list, caching of remote capabilities for 
> the purpose of cascading them.
> 

Yes, there should be a cache mechanism for this for remote layers, as well
as a time frequency flag to refresh contents of a cache.

..Tom


> J.F.
> 
> -----Original Message-----
> From: Kralidis, Tom 
> Sent: Thursday, March 27, 2003 11:28 AM
> To: Doyon, Jean-Francois; bart.van.den.eijnden at geodan.nl;
> mapserver-users at lists.gis.umn.edu
> Subject: RE: [Mapserver-users] cascading map server
> 
> 
> 
> 
> > -----Original Message-----
> > From: Jean-Francois.Doyon at CCRS.NRCan.gc.ca
> > [mailto:Jean-Francois.Doyon at CCRS.NRCan.gc.ca]
> > Sent: Thursday, March 27, 2003 11:18 AM
> > To: bart.van.den.eijnden at geodan.nl; 
> mapserver-users at lists.gis.umn.edu
> > Subject: RE: [Mapserver-users] cascading map server
> > 
> > 
> > Bart,
> > 
> > If you mean the OGC's WMS spec, and it's cascading abilities, 
> > yes MapServer
> > supports all that.
> > 
> > Simply read:
> > 
> > http://mapserver.gis.umn.edu/doc36/wms-client-howto.html
> > 
> > Though what you describe doesn't amount to cascading, 
> simply ingesting
> > remote layers.
> > 
> 
> When I think of cascading map server, I think of a WMS being 
> able to house another WMSs entire capabilities.  Currently, 
> in MapServer, from what I know, you can cascade to layers of choice.
> 
> What happens if I want to setup a WMS with MapServer and 
> cascade to another WMS which has 175 layers?  Do I have to 
> input them all in a mapfile as connectiontype=wms as a layer 
> definition?
> 
> Is there / can there be a mechanism, in a mapfile, to point 
> to a server URL, and MapServer can cascade the whole Capabilities XML?
> 
> ..Tom
> 
> 
> > Enjoy!
> > J.F.
> > 
> > -----Original Message-----
> > From: Bart van den Eijnden [mailto:bart.van.den.eijnden at geodan.nl]
> > Sent: Friday, March 21, 2003 11:54 AM
> > To: mapserver-users at lists.gis.umn.edu
> > Subject: [Mapserver-users] cascading map server
> > 
> > 
> > Hi,
> > 
> > does mapserver implement the cascading map server architecture?
> > 
> > I need to combine two images I get from two different map 
> > servers into one 
> > single image. Does anybody have an idea how to do this?
> > 
> > Thanks,
> > Bart
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