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 <[email protected]> > 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 WMSC is obsolete, WMTS is the real OGC specificiation.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 -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de _______________________________________________ dev mailing list [email protected] http://lists.openstreetmap.org/listinfo/dev
