hi, be carefull about on-the-fly-projection with wgs84-data and austrian data (MGI) because there are a few different towgs-informations in the epsg-database.
so if the towgs-information is not considered, there can be a north-east shift of about 75m during the on-the-fly-projection. i prepared some information about this issue under http://www.alectoria.at/content/view/17/1/ also i prepared there some prj-files including the towgs-information for Austria. best regards helli ------------------------------------- helmut kudrnovsky www.alectoria.at ------------------------------ Message: 3 Date: Wed, 7 Jan 2009 09:05:46 +0100 From: Otto Dassau <otto.das...@gmx.de> Subject: Re: [Qgis-user] Projection To: qgis-user@lists.osgeo.org Message-ID: <20090107090546.12b1c...@nature> Content-Type: text/plain; charset=US-ASCII Hi Werner, I tried to find your raster file projection "UTM_WGS84_M15", but it doesn't seem to be available. What happens if you create your own CRS in QGIS. From your .prj file this should work: Setings -> Custom CRS Name: UTM_WGS84_M15 Parameters: +proj=tmerc +lat_0=0 +lon_0=15 +k=0.9996 +x_0=500000 +y_0=-5000000 +ellps=WGS84 +units=m +datum=WGS84 +no_defs Then you load the raster, which is projected in "UTM_WGS84_M15", choose your custom projection in the Project Properties dialog, select "Enable OTF" and load the shape. The vector should now fit with the raster. regards, Otto On Mon, 05 Jan 2009 09:30:20 +0100 Werner Macho <werner.ma...@gmail.com> wrote: > Hi List! > > I gotta small problem here to proof that qgis is prime-time ready but .. > i have a raster and 3 vektor layers that i want to overlay > Rasterlayer is a geoTIF and as of .prj file: > PROJCS["UTM_WGS84_M15",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1 984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519 943295]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000],PA RAMETER["False_Northing",-5000000],PARAMETER["Central_Meridian",15],PARAMETER[" Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0],UNIT["Meter",1]] > > therefore a UTM_WGS84_M15 which seems to be not in the list of > projections (or am i wrong?) > > the Vektorlayers are normal shape files and as of .prj file: > PROJCS["MGI_Austria_GK_M34",GEOGCS["GCS_MGI",DATUM["D_MGI",SPHEROID["Bessel_184 1",6377397.155,299.1528128]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925 199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",750000.0], PARAMETER["False_Northing",-5000000.0],PARAMETER["Central_Meridian",16.33333333 333334],PARAMETER["Scale_Factor",1.0],PARAMETER["Latitude_Of_Origin",0.0],UNIT[ "Meter",1.0]] > > which i expect to be the MGI / Austria M34 projection and i can find it > in the KBS List > > > So can anybody give me a hint howto solve the rasterlayer projection > because otherwise i cant overlay vector OTF on the Raster (My > Information is that it can only work in that direction. > > Thanks a lot > regards > Werner > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-user ------------------------------ Message: 4 Date: Wed, 07 Jan 2009 11:34:35 +0100 From: Werner Macho <werner.ma...@gmail.com> Subject: Re: [Qgis-user] Projection To: Otto Dassau <otto.das...@gmx.de> Cc: qgis-user@lists.osgeo.org Message-ID: <4964853b.8030...@gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Hi Otto! (and list) Thanks for your help. It worked. At least in Windows - because i can remember that i tried nearly the same with Linux and it did not. But I have to check that anyway when I'm back home and on my Linux-PC. Expect a mail with a report on linux too ;) So it seems that there is really no existing projection for the (in austria) common UTM WGS84 M15. And nevertheless - all files i loaded into QGIS where fully equipped with a .prj file. So were there any discussion about reading .prj files i missed or can someone (hopefully a developer) provide me some information why QGIS is not reading .prj infos? At least a small button with "read prj file" to give the right .prj file for reading raster or vector files would even be more helpfull (and at least easier) than defining the projection by myself. I know it's the same as SPSS vs. R where it can lead to wrong interpreted results using a click-click interface compared to a "console-driven" text interface where you really have to know what you are doing but .. see the .prj files are provided so why looking for the projection if it is already there? Is there any ongoing discussion about trying to read the .prj files automatically or at least integrate them in the loading process somehow? thanks to all for your help and information regards werner > Hi Werner, > > I tried to find your raster file projection "UTM_WGS84_M15", but it doesn't > seem > to be available. What happens if you create your own CRS in QGIS. From your > .prj > file this should work: > > Setings -> Custom CRS > > Name: UTM_WGS84_M15 > Parameters: +proj=tmerc +lat_0=0 +lon_0=15 +k=0.9996 +x_0=500000 +y_0=-5000000 > +ellps=WGS84 +units=m +datum=WGS84 +no_defs > > Then you load the raster, which is projected in "UTM_WGS84_M15", choose your > custom projection in the Project Properties dialog, select "Enable OTF" and > load the shape. The vector should now fit with the raster. > _______________________________________________________________________ Sensationsangebot verlängert: WEB.DE FreeDSL - Telefonanschluss + DSL für nur 16,37 Euro/mtl.!* http://dsl.web.de/?ac=OM.AD.AD008K15039B7069a _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user