[QGIS-trac] [Quantum GIS] #3099: Projection Failure

[Quantum GIS]

#3099: Projection Failure
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   Reporter:  badams                                     |              Owner:  nobody       
       Type:  bug                                        |             Status:  new          
   Priority:  critical: causes crash or data corruption  |          Milestone:  Version 1.6.0
  Component:  Build/Install                              |            Version:               
   Keywords:  Projection Failure                         |   Platform_version:               
   Platform:  Windows                                    |           Must_fix:  No           
Status_info:  0                                          |  
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 QGIS does not operate with Australian Datums AGD66, AGD84 and GDA94.
 Although it will allow the selection of these datums, they are not applied
 to the data upon importing instead defaulting to WGS84. In the case of
 GDA94 V's AGD84 this results in an approx 200m offset error.

 Similarly when exporting the data to either Shapefiles or Mapinfo TAB
 files, the projection is not sticking maintaining the default WGS84.

 Roland Hill and Ken Norris(QGIS users) figured out the projection problem
 lies within the SRS.DB file and the Australia distortion grids (AGD66.gsb
 and AGD84.gsb), possibly indicating the problem lies with Proj4. I have
 attached Roland's edited files, he was able to make these work on the
 Linux platform but they didn't work for me on Windows 7. Not sure if he
 was able to get the projections to stick, I never did.

 Attached CSV file contains data points in AGD66, AGD84, GDA94 and WSG84.
 This is the same grid in different datums. Note the AGD66 datum uses the
 "AGD66(5m)-Australia-GDA94" Local Datum Transformation. There are at least
 10 other AGD66 - Local Datum Transformations however only  AGD66(5m
 )-Australia-GDA94 covers all of Australia (or so I believe).

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Ticket URL: <https://trac.osgeo.org/qgis/ticket/3099>
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