[QGIS-trac] [Quantum GIS] #3547: On loading a layer: CRS behaviour does not work as expected for shapefiles and geotiffs no created by QGIS

[Quantum GIS]

#3547: On loading a layer: CRS behaviour does not work as expected for shapefiles
and geotiffs no created by QGIS
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   Reporter:  benoitrsa                                               |              Owner:  nobody               
       Type:  bug                                                     |             Status:  new                  
   Priority:  major: does not work as expected                        |          Milestone:  Version 1.7.0        
  Component:  Projection Support                                      |            Version:  Trunk                
   Keywords:  CRS,Projection,load,default ,Shapefile,PRJ,QPJ,geotiff  |   Platform_version:  WinXP, Win7, Mac OS X
   Platform:  Windows                                                 |           Must_fix:  Yes                  
Status_info:  0                                                       |  
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 This ticket merges #3529 and #3537. Both tickets have now been closed.

 Behaviour:
 When loading a shapefile not created by QGIS (e.g. not having a .qpj file,
 but only a .prj) or when loading a geotiff file (having a CRS meta block,
 as reported by GDAL) into QGIS their respective CRS (in the .prj file for
 the shapefile, and in the meta block for the geotiff) are ignored by QGIS.

 Explanation:
 On loading a layer that do not have a CRS into QGIS there are three
 options: 1) ask user, 2) use project default CRS, and, 3) use QGIS default
 CRS.

 One of those options should only be active if the loaded layer *does not*
 have a CRS.

 For shapefile, QGIS does not recognise the .prj file. QGIS needs the qpj
 to recognise that the layer has a CRS.

 For geotiff, QGIS does not recognise the CRS in the meta block of the
 file.

 - When option 1) is in effect, QGIS asks the user for a CRS.
 - When option 2) is on, QGIS silently sets the CRS of the shapefile or
 geotiff to the project CRS.
 - When option 3) is on, QGIS silently sets the CRS of the shapefile or
 geotiff to the default CRS.

 Thus, when options 2) or 3) are active, the layer is located at the wrong
 place, if its "true" CRS is different from the project or default CRS
 respectively.
 When option 1) is active, it is a pain to be asked for a CRS.

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Ticket URL: <https://trac.osgeo.org/qgis/ticket/3547>
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