Re: [mapserver-users] Projection takes less time than no projection ?
Yes, you're right ! thanks a lot ! My projection (epsg dat) def file had some errors. I made some corrections on my proj espg dat files and it works fine with PROJECTION "init=epsg:3785" END Everywhere Response times now make sense : +10% when projection's enabled (on a specific test tile) De : TC Haddad [mailto:tchad...@gmail.com] Envoyé : mardi 4 décembre 2012 17:29 À : Clément MONIER Objet : Re: [mapserver-users] Projection takes less time than no projection ? Strange. Maybe you should check your proj EPSG code list and search for 3785 to see if it is listed there (maybe it is missing for some reason?). Or if it is in there, compare it to the defs below to look for any mistakes Tanya On Tue, Dec 4, 2012 at 7:57 AM, Clément MONIER mailto:clement.mon...@v-trafic.com>> wrote: I did try but it didn't give me the same map view (though requested with TILE=X+Y+Z) I don't know why, but (only in the new mapfile version) if I don't put a MAP projection block like this PROJECTION "proj=merc" "a=6378137" "b=6378137" "lat_ts=0.0" "lon_0=0.0" "x_0=0.0" "y_0=0" "k=1.0" "units=m" "nadgrids=@null" "no_defs" END Instead of PROJECTION "init=epsg:3785" END I don't get the same map's view De : TC Haddad [mailto:tchad...@gmail.com<mailto:tchad...@gmail.com>] Envoyé : mardi 4 décembre 2012 16:51 À : Clément MONIER Objet : Re: [mapserver-users] Projection takes less time than no projection ? did you try this option for comparison? MAP ... PROJECTION "init=epsg:3785" END ... LAYER ... PROJECTION "init=epsg:3785" END ... END ... END On Tue, Dec 4, 2012 at 7:23 AM, Clément MONIER mailto:clement.mon...@v-trafic.com>> wrote: MAP ... PROJECTION "init=epsg:3785" END ... LAYER ... PROJECTION "init=epsg:4326" END ... END ... END ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
Re: [mapserver-users] Projection takes less time than no projection ?
Clément, There is an optimized route for reprojection from 4326 -> 3857 in MapServer (see http://lists.osgeo.org/pipermail/mapserver-dev/2012-February/011956.html) so it can be very fast. I can't see how if could be faster than no projection. Perhaps the 10% is just within the margin of error? Or did you do the test 1000's of times and average the results? That might be what it takes to really see a difference. Mike -- Michael Smith US Army Corps Remote Sensing GIS/Center From: Clément MONIER mailto:clement.mon...@v-trafic.com>> Date: Tuesday, December 4, 2012 7:23 AM To: "mapserver-users@lists.osgeo.org<mailto:mapserver-users@lists.osgeo.org>" mailto:mapserver-users@lists.osgeo.org>> Subject: [mapserver-users] Projection takes less time than no projection ? Resent-From: Michael Smith mailto:michael.sm...@usace.army.mil>> Hi All, I’m using MapServer to generate tiles to overlay on a GoogleMaps base layer. My data files are WGS84 shapefiles. So my current mapfile was looking like : MAP … PROJECTION "init=epsg:3785" END … LAYER … PROJECTION "init=epsg:4326" END … END … END I was wondering about improving response time by disabling on-the-fly projection. So I did pre-project my shp into spherical Mercator first. And my new mapfile now looks like : MAP … PROJECTION"proj=merc""a=6378137""b=6378137""lat_ts=0.0" "lon_0=0.0""x_0=0.0""y_0=0""k=1.0""units=m""nadgrids=@null" "no_defs" END … LAYER … END … END I do get the same tiles. But when asking a single tile using both mapfile, I noticed that the response time was higher (about +10%) when the second mapfile was used ! Do you have any idea about what’s going on ? Thanks & Regards Clément ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
[mapserver-users] Projection takes less time than no projection ?
Hi All, I'm using MapServer to generate tiles to overlay on a GoogleMaps base layer. My data files are WGS84 shapefiles. So my current mapfile was looking like : MAP ... PROJECTION "init=epsg:3785" END ... LAYER ... PROJECTION "init=epsg:4326" END ... END ... END I was wondering about improving response time by disabling on-the-fly projection. So I did pre-project my shp into spherical Mercator first. And my new mapfile now looks like : MAP ... PROJECTION"proj=merc""a=6378137""b=6378137""lat_ts=0.0" "lon_0=0.0""x_0=0.0""y_0=0""k=1.0""units=m""nadgrids=@null" "no_defs" END ... LAYER ... END ... END I do get the same tiles. But when asking a single tile using both mapfile, I noticed that the response time was higher (about +10%) when the second mapfile was used ! Do you have any idea about what's going on ? Thanks & Regards Clément ___ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
