[QGIS-trac] [Quantum GIS] #3118: GdalTools (warp): add support for ntv2 grid and +towgs84 transformations

[Quantum GIS]

#3118: GdalTools (warp): add support for ntv2 grid and +towgs84 transformations
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   Reporter:  lutra                             |              Owner:  brushtyler   
       Type:  enhancement                       |             Status:  new          
   Priority:  major: does not work as expected  |          Milestone:  Version 1.6.0
  Component:  Python plugins and bindings       |            Version:  Trunk        
   Keywords:                                    |   Platform_version:               
   Platform:  All                               |           Must_fix:  Yes          
Status_info:  0                                 |  
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 Hi Giuseppe, this is the new description for the old ticket available in
 the gdal tools tracker.

 https://trac.faunalia.it/GdalTools-plugin/ticket/57

 Please have a look also to the new description of ticket that describes
 the same enhancement request, but for vectors.

 https://trac.osgeo.org/qgis/ticket/2913#comment:3

 -------------------

 in qgis:
 [[BR]]
 [[BR]]

 *) 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. The same menu would serve to import grids for
 vectors transformation (see #2913).
 [[BR]][[BR]]

 in the "warp" tool:

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

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

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

 *) add 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.

 g) make the windows where the command shows, while the users chooses the
 options, editable. I know there is already a ticket about this.

-- 
Ticket URL: <http://trac.osgeo.org/qgis/ticket/3118>
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