[OSM-dev] WMSC - bachelor thesis
MRHarmonie at gmx.de
MRHarmonie at gmx.de
Wed Aug 17 19:01:38 BST 2011
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>
> > WMSC is obsolete, WMTS is the real OGC specificiation. osm uses
> > which is not normalized, some kind of custom TMS service. several
> > 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, it's
> just an overcomplicated version of TMS.
> Gotta love OGC standards.
>  http://lists.osgeo.org/pipermail/tilecache/2009-September/002031.html
> 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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