Hi, Thanks for your explanation on this issue.
It would be a good idea if the developer added your text in the dialog box, or added as an option in the current dialog box. I do not think that there are so many users who will use this function in daily life - and therefor a distraction - but usefull for you :) Regards Lene Fischer Associate Professor Department of Geosciences and Natural Resource Management University of Copenhagen MOB +45 40115084 [email protected]<mailto:[email protected]> [SCIENCE_bomaerke_UK] -----Oprindelig meddelelse----- Fra: [email protected] [mailto:[email protected]] På vegne af Saulteau Don Sendt: 3. januar 2014 18:39 Til: [email protected] Emne: Re: [Qgis-user] New dialog when opening layer with a different CRS That's so a user can apply datum transformations from one coordinate system to another (ie, NAD27 <-> NAD83 <-> NAD83(CSRS)). They are usually compiled into Proj4 through grid shift binary files (.gsb) often available from federal or provincial and local agencies. For example, in British Columbia, a lot of data comes in EPSG:26910 (UTM Zone 10N / NAD83) or EPSG:3005 (BC Albers / NAD83). But converting either of those to EPSG:3153 (BC Albers / NAD83,CSRS) which uses the Canadian Spatial Reference Standard/System requires a custom "transformation" that can only be applied when using NTv2 grid shift files. Or old NRCAN Atlas of Canada data can come in a Lambert Conformal Conic projection in the NAD27 datum. This is a long awaited feature and I'm very excited for it! This way I don't have to drop back to command line to do my vector data transformations. http://webapp.geod.nrcan.gc.ca/geod/tools-outils/index.php ftp://ftp.gdbc.gov.bc.ca/pub/world/NTv2.0 http://forums.arcgis.com/threads/4267-Custom-transformation-nad83-to-nad83-CSRS-for-British-Columbia SaultDon On Fri, Jan 3, 2014 at 2:38 AM, Lene Fischer <[email protected]<mailto:[email protected]>> wrote: > Hi, > > Using QGIS weekly. > > When I open a new layer with a different CRS I get a dialog "Select > datum transformations for layer .." > > I´ve already set "Enable on the fly" - > > Just clicking OK it works- but I don´t understand this dialog - can > anyone help for an explonation? > > Regards > > > > > > > > Lene Fischer > > Associate Professor > > > > Department of Geosciences and Natural Resource Management > > University of Copenhagen > > > > MOB +45 40115084 > > [email protected]<mailto:[email protected]> > > > > > > > > > > > > > > _______________________________________________ > Qgis-user mailing list > [email protected]<mailto:[email protected]> > http://lists.osgeo.org/mailman/listinfo/qgis-user _______________________________________________ Qgis-user mailing list [email protected]<mailto:[email protected]> http://lists.osgeo.org/mailman/listinfo/qgis-user
<<inline: image001.jpg>>
_______________________________________________ Qgis-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/qgis-user
