[Qgis-user] RE: [Qgis-community-team] Problem changing a shapefile's coordinates

[giannis Nj]

Problem solved guys, than you all for the help.




From: netsagief at hotmail.com
To: alister.hood at synergine.com; qgis-user at lists.osgeo.org
Date: Wed, 28 Sep 2011 10:50:17 +0000
CC: 
Subject: [Qgis-user] RE: [Qgis-community-team] Problem changing a	shapefile's coordinates








After reading all the answers and re-projecting to 4326 from the
 original .shp file (using save as..), i think that my problem is the 
projection of my .tiff data, because all my files in WGS84 projects at 
approximately the same coordinates (-92,35 as Brad said) but my raster 
file of the same area is at (25,35), so if i want to project all files 
at this CRS i have to "move" somehow my .tiff file at the above 
coordinates (and not the opposite as i was trying so long), am i right 
or wrong? Is there a way to change the coordinates that my tiff 
projects? I tried "on the fly" and by specifying the 4326 CRS from the file's properties but that 
doesn't changed anything, 25,35 remains. 



Thanks all for the answers, I know i am a bit trouble! 






> Subject: RE: [Qgis-community-team] Problem changing a shapefile's coordinates
> Date: Wed, 28 Sep 2011 10:30:09 +1300
> From: alister.hood at synergine.com
> To: netsagief at hotmail.com; qgis-user at lists.osgeo.org
> 
> Hi,
> 
> > -----Original Message-----
> > From: qgis-community-team-bounces at lists.osgeo.org
> [mailto:qgis-community-team-
> > bounces at lists.osgeo.org] On Behalf Of giannis Nj
> > Sent: Tuesday, 27 September 2011 10:53 p.m.
> > To: qgis-user at lists.osgeo.org; qgis-community-team at lists.osgeo.org
> > Subject: [Qgis-community-team] Problem changing a shapefile's
> coordinates
> > 
> > Hello,
> > 
> > I have a .tiff file and a .shp one, showing the same area in the map
> but they
> > come in different coordinates. From the Properties of these files I
> give them
> > the same projection (4326 - WGS84), same as the project properties,
> but still
> > they don't match. Actually, the coordinates of the shapefile remain
> the same
> > (different from the project's), something that I thought would change
> by
> > changing the CRS.
> 
> Like Micha said, assigning a different CRS to a layer does not change
> the coordinates of features in the layer, it just tells QGIS which CRS
> the coordinates are in, for the sake of 'on the fly' CRS transformation.
> For a layer to show up in the correct place you must assign it the
> correct CRS (if not already assigned), and either:
> (1) enable 'on the fly' CRS transformation, or 
> (2) save copy of the layer, transformed into the same CRS as the
> project, as the other guys have described, and use that copy.
> 
> (1) is fine if you only need to display the layer.  If you need to do
> some sort of spatial analysis using layers in different CRSs you
> normally need to do (2), because many tools in QGIS require layers to be
> in the same CRS.
> 
> > I guess it's not that simple to change the coordinates in a
> > file, so i would like to ask how it is possible to manage this so that
> the two
> > files will come in the same coordinates. Is something in the settings
> that i
> > forget to do? Is this able in QGIS or i have to try on another GIS
> program?
> > 
> > Thank you.
> 
> Regards,
> Alister
 		 	   		  

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