[QGIS-trac] Re: [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         
      Resolution:                                    |      Keywords:               
Platform_version:                                    |      Platform:  All          
        Must_fix:  No                                |   Status_info:  0            
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Comment (by lutra):

 Italy is not the only case, there are obviously others (in my case I'm
 referring to Portugal).

 My suggestion is to implement this '''#1908''' and then just maintain the
 list of datum association (3 and 7 parameters transformation).

 Ex:
 http://trac.osgeo.org/grass/browser/grass/branches/releasebranch_6_4/lib/gis/datumtransform.table

 http://trac.osgeo.org/grass/browser/grass/branches/releasebranch_6_4/lib/gis/datum.table

 [[BR]]
 [[BR]]
 [[BR]]


 Missing/correct definitions for Portugal

     * [D73HG] HAYFORD-GAUSS DATUM 73

 http://www.igeo.pt/produtos/Geodesia/Inf_tecnica/sistemas_referencia/Datum_73.htm

 +proj=tmerc +lat_0=39.66666666666666 +lon_0=-8.131906111111112 +k=1
 +x_0=180.598 +y_0=-86.98999999999999 +ellps=intl
 +towgs84=-239.749,88.181,30.488,0.263,0.082,1.211,2.229

     * [DLXHG] HAYFORD-GAUSS DATUM LISBOA (IGP)

 http://www.igeo.pt/produtos/Geodesia/Inf_tecnica/sistemas_referencia/Datum_Lx.htm

 +proj=tmerc +lat_0=39.66666666666666 +lon_0=-8.131906111111112 +k=1 +x_0=0
 +y_0=0 +ellps=intl
 +towgs84=-288.885,-91.744,126.244,-1.691,0.410,-0.211,-4.598

     * [DLXHGMIL] HAYFORD-GAUSS DATUM LISBOA (Militar)

 +proj=tmerc +lat_0=39.66666666666666 +lon_0=-8.131906111111112 +k=1
 +x_0=200000 +y_0=300000 +ellps=intl
 +towgs84=-288.885,-91.744,126.244,-1.691,0.410,-0.211,-4.598

-- 
Ticket URL: <https://trac.osgeo.org/qgis/ticket/2332#comment:1>
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