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

[giannis Nj]

Finally my raster file was in the right position, 25,35 in 4326 WGS84 for Greece. So I found the firstly first shapefile from the source (a goverment web with open gis data), because the "source" file i was working has been already re-projected once and the "save as" in QGIS was giving me wrong projection. So i did the reprojecting procedure with the original file and they matched exactly with my raster data, that was all! 



Date: Wed, 28 Sep 2011 09:53:04 -0500
Subject: Re: [Qgis-user] RE: [Qgis-community-team] Problem changing a	shapefile's coordinates
From: gisbradokla at live.com
To: qgis-user at lists.osgeo.org

we like to hear about the solutions. (esp when they are silly).
I was about to suggest gdal for raster re-project.
but knew you would need the original projection.
 
glad to hear.


 
2011/9/28 giannis Nj <netsagief at hotmail.com>



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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