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52/20 answers
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 projection
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Jan
5
comment QGIS Graphics Glitch after changing CRS
Does it help if you reproject the layer to Robinson using Save as ..., and load only that layer?
Jan
5
revised How can I modify the coordinates of a raster in the QGIS?
added 245 characters in body
Jan
4
answered How can I modify the coordinates of a raster in the QGIS?
Jan
3
comment QGIS and the South Pole: bug or feature?
Because all meridians touch in one point. You would not see that in "normal" mercator or transverse mercator projections of populated parts of the world. There you only have more ore less bended lines. Mathematically, this is far more simple than mapping the poles correctly.
Jan
3
comment QGIS and the South Pole: bug or feature?
See my answer on gis.stackexchange.com/questions/173766/… and gis.stackexchange.com/questions/126747/…
Jan
3
awarded  Revival
Jan
3
comment Using different CRS for map and data?
No, just coordinates. These don't have to be lat/long degrees.
Jan
3
answered QGIS and the South Pole: bug or feature?
Jan
3
comment Using different CRS for map and data?
No, vector data just contains X and Y coordinates (and maybe Z too). From the CRS information the software knows the unit: degrees, meters or feet.
Jan
2
comment Using different CRS for map and data?
Every GIS data comes with CRS information, or you are prompted for it. When activating OTF, you select a project CRS, to which every layer gets reprojected to. The project CRS can be set different from all layer CRS.
Jan
1
comment Using different CRS for map and data?
If you combine data from different sources, it is quite common. One party using degrees, others something in meters, old sources in feet etc...
Jan
1
comment Importing ESRI:102091 Monte Mario reference system
Glad to help. Think of accepting the answer: gis.stackexchange.com/help/someone-answers since it seems to solve your matter.
Dec
31
answered Using different CRS for map and data?
Dec
31
comment Crop raster from vector problem
I have not checked it further, but the EXTENSION parameter should make it clear to gdalwarp that the special google mercator hack of ellipsoid and sphere should be used. The .qpj contains the same, while ESRI and gdalwarp does not use it.
Dec
30
revised Crop raster from vector problem
added 24 characters in body
Dec
30
comment Crop raster from vector problem
I used the one from arcscripts.esri.com/details.asp?dbid=10806. But it works because no .prj file is generated, and so gdalwarp uses the tif CRS. See my answer for full details.
Dec
30
revised Crop raster from vector problem
added 239 characters in body
Dec
30
answered Crop raster from vector problem
Dec
30
comment Crop raster from vector problem
Can you upload the shapefile somehwere?
Dec
29
revised Orthographic reprojection with mapnik
typo