[OSM-dev] WMSC - bachelor thesis

[MRHarmonie at gmx.de]

all in all.

wms is more flexible then wmsc. but nobody is using wmsc because of the standard wmts and tms?

but what is the difference between wmts and wmsc - they do the same, dont they? both deliver tiles ... its a kind of weird for me :)

Is TMS the same like my mapnik-tirex-based tile server or is it more like wms with requests via url... i mean do i make the same getcapabilities-stuff with wmts and tms?

I think i have to use the geowebcache and mapproxy software. 
I need to set up a tiled wms filled with a osm database but the whole standard non-standard webmapservices are confusing me.

I welcome your help. thanks a lot 



> On Wed, Aug 17, 2011 at 1:48 PM, sorel johann <johann.sorel at geomatys.fr>
> wrote:
> 
> > WMSC is obsolete, WMTS is the real OGC specificiation. osm uses
> something
> > which is not normalized, some kind of custom TMS service. several
> projects
> > out there us custom services, google maps, bing maps, yahoo maps ...
> 
> Or alternatively, the OGC made a mess of the TMS specification and
> made it incompatible with the vast majority of TMS-like maps that
> existed at that time.
> 
> Also, I've never heard of WMTS, but from what little I read[1], it's
> just an overcomplicated version of TMS.
> 
> Gotta love OGC standards.
> 
> Cheers,
> Andy
> 
> [1] http://lists.osgeo.org/pipermail/tilecache/2009-September/002031.html
> 



> Hi,
> 
> WMS-C means that WMS-C capable client (such like uDig or OpenLayers) is
> sending otherwise normal WMS GetMaps but with an extra parameter
> &TILED=YES and strictly controlled and synchronized BBOX, WIDTH, and
> HEIGHT parameters. The WMS-C capable server sends the information about
> the tiling schema with the GetCapabilities response so that the client can
> build reasonable requests.
> 
> If WMS-C server receives such a request it knows to seach the tile first
> from the cache. It the tile is cached the response is very fast and
> comparable with all the other tile server implementations that exist. If
> the image is not cached the request is passed on to a normal WMS server
> pipe and the speed is the same as with normal WMS.
> 
> If you want to do direct comparison of speed with direct WMS and cached
> WMS-C then make sure that the WMS-C cache is populated.  Next do whole lot
> of tiled requests with for example uDig and capture them from the server
> cache.  Make two test request sets with the original requests and modified
> requests where the &TILED=YES part is ripped off.  That way they should go
> to WMS server instead of the cache. Finally run the requests with jMeter
> with varying number or concurrent requests. I am not sure if such
> comparison makes much sense, because typically 256x256 sized tiled
> requests do not suit direct WMS usage best. But if you want to get a
> result that shows that WMS-C is faster than direct WMS, this is the way to
> achieve it.
> 
> I would say that GeoWebCache would be the easiest way to setup a WMS-C
> server (and TMS and WMTS at the same time). WMTS is an OGC standard and
> accepted to be used with Inspire view services, so why not to test it for
> your thesis?
> 
> -Jukka Rahkonen-
> 
> 
> BG wrote:
> > Hej there,
> >
> > At the moment I am working on my bachelor thesis using osm data to
> create cached-wms (wmsc).
> >
> > I now have a running mapnik based tirex tile-server combined with a wms
> via mod_mapnik_wms. Next, I want to use the tilecache.org wmsc.
> >
> > I have some questions and hope to find help along my path.
> >
> > 1. Are there any possibilties to check the performance of a wms/wmsc? I
> want to compare the server performance. I just need to see, if wmsc is
> faster than wms.
> >
> > 2. I thought wmsc has to be faster than wms - but nobody is using it, is
> there a reason?
> >
> > 3. I know the mod_mapnik_wms and the wmsc from tilecache.org - do u know
> more or better software, which does or doesn't work mapnik based? Is
> there an alternative to mapnik?
> >
> > 4. Is there a possibility to synchronize the database automatically,
> which i need to import from osm?
> >
> > 5. While importing via osm2pgsql the system used 4gb ram - how much
> would i need for the planet file?
> >
> > I would appreciate any help.
> >
> > Best regards,
> > Bernd

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