[QGIS-trac] Re: [Quantum GIS] #2913: add support for ntv2 grids and +towgs84 parameters in the "save as..." dialogs (was: add a "SOURCE SRS" option in the "save as..." and "save selection as..." dialogs)

[Quantum GIS]

#2913: add support for ntv2 grids and +towgs84 parameters in the "save as..."
dialogs
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   Reporter:  lutra                             |              Owner:  nobody       
       Type:  enhancement                       |             Status:  new          
   Priority:  major: does not work as expected  |          Milestone:  Version 1.6.0
  Component:  Data Provider                     |            Version:  Trunk        
   Keywords:                                    |   Platform_version:               
   Platform:  All                               |           Must_fix:  Yes          
Status_info:  0                                 |  
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Comment(by lutra):

 Follow up description, more resumed and clear (I hope):[[BR]]
 [[BR]]


 I would like to resume better what would be needed to add the support for
 transformations with ntv2 grids and/or +towsgs84 parameters
 [[BR]]
 [[BR]]


 a) a new menu to allow a user import ntv2 grids (.gsb files): the same
 files need to be copied in the proper system location, for example
 "/etc/proj" for linux
 [[BR]][[BR]]

 b) add a "source srs" field in the "save as..." and "save selected as..."
 dialogs
 [[BR]][[BR]]

 c) in the same dialog add a dropdown to let the user choose the
 appropriate ntv2 grid, among the ones available in the proper system
 folder
 [[BR]][[BR]]

 d) if the user chooses a ntv2 grid the underlying ogr2ogr operation MUST
 always add the "+wktext" parameter in the source srs definition
 [[BR]][[BR]]

 e) if the user chooses a ntv2 grid the underlying ogr2ogr operation MUST
 always add the "+towgs84=0,0,0" parameter in the target srs definition, if
 this srs is a projected one
 [[BR]][[BR]]

 f) a field to let the user write manually +towgs84 parameters in case
 he/she don't want/need to use ntv2 grids. This field and the ntv2 dropdown
 need to be mutually exclusive.
 [[BR]][[BR]]

 g) add a windows, like the one that shows in the gdal tools, and show the
 ogr2ogr command as it is forming while the users chooses the parameters,
 and make this command editable, like it was already asked for the gdal
 tools.

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Ticket URL: <https://trac.osgeo.org/qgis/ticket/2913#comment:3>
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