Hi Jose, thanks for your investigations on Google Map TMS support. I am not sure about the legal status of that approach. Probably it's not in the sense of Google. But as Google seems to have a very lax point of view on the topic I decided to add that XML to
http://sourceforge.net/apps/mediawiki/qlandkartegt/index.php?title=Collection_of_WMS_maps until I get a complain from Google. I did a few investigations on myself why the built-in tile server client does not work. The result, instead of a picture Google sends back HTML, telling me that the request is from a program not authorized to request tiles. :( As expected Google is not happy if we do that. Oliver > On Thursday, 26 May 2011, at 21:55:38 +0200, > Oliver Eichler wrote: > >> These are error messages from GDAL. And yes it is slow. GDAL does not >> cache the tiles and it blocks until the complete screen is read. That is >> why QLGT has it's own tile server support. >> > Well, as it seems I was unable to make the tile server support introduced in > QLGT 1.1.2 work as expected with custom URL, I took another (apparently > unexplored) route: taking advantage of GDAL's WMS/TMS support to real-time > load map data from remote servers, according to an XML definition as > described on the following URL: > > http://www.gdal.org/frmt_wms.html > > Which, as I understand it, links to the following paragraph from your last > post: > >> Forget about WMS_CLIENT. That is old code. It's not functional in any >> way. It's just there because I did not clean up so far. WMS support is >> done 100% by GDAL. From QLGT's point if view it's just another map >> format supported by GDAL. >> > So the support for remote WMS/TMS in QLGT thanks to support for them in > recent GDAL versions seems known and expected but, as far as I have been > able to see, scarcely used, if at all. See the following inline GDAL XML > definition for Google map services I've been successfully using: > > <GDAL_WMS> > <!-- Data is subject to term of use detailed at > http://code.google.com/intl/nl/apis/maps/terms.html and > http://www.google.com/intl/en_ALL/help/terms_maps.html --> > <Service name="TMS"> > <!-- Google Map --> > > <ServerUrl>http://mt1.google.com/vt/lyrs=m@155000000&hl=es&x=${x}&y=${y}&z=${z}&s=Gali</ServerUrl> > <!-- Google Streets --> > > <!--<ServerUrl>http://mt.google.com/vt/lyrs=h@155000000&hl=es&x=${x}&y=${y}&z=${z}</ServerUrl> > --> > <!-- Google Satellite --> > > <!--<ServerUrl>http://khm0.google.es/kh/v=86&x=${x}&s=&y=${y}&z=${z}&s=</ServerUrl> > --> > </Service> > <DataWindow> > <UpperLeftX>-20037508.34</UpperLeftX> > <UpperLeftY>20037508.34</UpperLeftY> > <LowerRightX>20037508.34</LowerRightX> > <LowerRightY>-20037508.34</LowerRightY> > <TileLevel>20</TileLevel> > <TileCountX>1</TileCountX> > <TileCountY>1</TileCountY> > <YOrigin>top</YOrigin> > </DataWindow> > <Projection>EPSG:900913</Projection> > <BlockSizeX>256</BlockSizeX> > <BlockSizeY>256</BlockSizeY> > <BandsCount>3</BandsCount> > <MaxConnections>5</MaxConnections> > <Cache /> > </GDAL_WMS> > > From inside QLGT, if you "File" -> "Load Map" and select the above XML > file, you get a real-time Google Maps raster layer quite useable and with > zoom and image resolution adapting fine to QLGT zoom levels (and checking > "quadratic zoom", one on my previous complaints is gone). > > Furthermore, it seems (recent) GDAL versions have a working caching > mechanism (see the GDAL URL above) I have been experimenting with > successfully. A block like the following added to the XML GDAL file for the > map resource speeds things up (a lot), and helps reduce network load: > > <Cache> > <Path>/tmp/gdalwmscache</Path> > <Depth>2</Depth> > <Extension>.jpg</Extension> > </Cache> > > Although this real time raster layer support is far from perfect, it is a > very important feature that enables the use of QLGT for people used to more > featured programs. The only severe problem I have noticed so far is if I > try to overlay a Garmin vector map on top, no matter what I try, the > program starts eating memory like crazy, until it ends up crashing due to > an out of memory condition (seems to die by itself, Linux out of memory > killer seems not to kick in). > > > I don't know if all the above information is well known, but at least I was > unable to find if that was possible or not, and could deserve a place into > the wiki or on the "features" page for the program. A way to see if there > is a remote WMS/TMS being used from QLGT would also be nice (currently > there seems to be no way to tell if there is any WMS/TMS in use). > > Anyway, great piece of software. Nice, and getting better. > > Hope it helps. Greetings, > > > > > ------------------------------------------------------------------------------ > vRanger cuts backup time in half-while increasing security. > With the market-leading solution for virtual backup and recovery, > you get blazing-fast, flexible, and affordable data protection. > Download your free trial now. > http://p.sf.net/sfu/quest-d2dcopy1 > > > > _______________________________________________ > Qlandkartegt-users mailing list > Qlandkartegt-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users ------------------------------------------------------------------------------ vRanger cuts backup time in half-while increasing security. With the market-leading solution for virtual backup and recovery, you get blazing-fast, flexible, and affordable data protection. Download your free trial now. http://p.sf.net/sfu/quest-d2dcopy1 _______________________________________________ Qlandkartegt-users mailing list Qlandkartegt-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users
