[QGIS-trac] [Quantum GIS] #2332: please add +towgs parameters

[Quantum GIS]

#2332: please add +towgs parameters
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   Reporter:  pcav                              |              Owner:  nobody       
       Type:  enhancement                       |             Status:  new          
   Priority:  major: does not work as expected  |          Milestone:  Version 1.5.0
  Component:  Project Loading / Saving          |            Version:  HEAD         
   Keywords:                                    |   Platform_version:               
   Platform:  All                               |           Must_fix:  No           
Status_info:  0                                 |  
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 Standard EPSG code for Italian projections (3003 and 3004) do not include
 datum; as a result, reprojection is always wrong by about 100 m. Can we
 add 4 more projection definition to our SRS database?
 It should  only be added the +towgs84 parameter so that we'll have:

 3003 corrected, mainland: same as 3003, with
 +towgs84=-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68

 3004 corrected, mainland: same as 3004, with
 +towgs84=-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68

 3003 corrected, Sardinia: same as 3003, with
 +towgs84=-168.6,-34.0,38.6,-0.374,-0.679,-1.379,-9.48

 3004 corrected, Sicily:  same as 3004, with
 +towgs84=-50.2,-50.4,84.8,-0.690,-2.012,0.459,-28.08

 In GRASS this has been solved by a similar approach:
 http://freegis.org/cgi-
 bin/viewcvs.cgi/*checkout*/grass/src/libes/gis/datumtransform.table?rev=HEAD&
 content-type=text/plain
 I think this can be done now, as it does not impact anything else, and it
 would make life a lot easier for Italian users (remember, the second
 largest QGIS user community!).
 Details in http://www.crs-geo.eu/

 New custom codes should be in the 32,768-100,000 range; 39031, 39032,
 39041, 39042 should be ok.

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Ticket URL: <https://trac.osgeo.org/qgis/ticket/2332>
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