[Proj] EPSG:28992 to EPSG:23031 conversion

[Jean-Claude REPETTO]

Kristian Thy a écrit :
> On Thu, Oct 09, Mikael Rittri wrote:
>> I looked in the EPSG database and found three transformations that could be useful. 
>>
>> Name               | Code | Accuracy | Parameters for cs2cs 	
>> ED50 to WGS 84 (1) | 1133 |   10 m   | +towgs84=-87,-98,-121
>> ED50 to WGS 84 (2) | 1134 |    6 m   | +towgs84=-87,-96,-120
>> ED50 to WGS 84 (32)| 1999 |    3 m   | +towgs84=-83.11,-97.38,-117.22,0.005693,-0.04469,0.04428,1.218
> 
> Newbie question - where would one look to find these numbers? I am aware
> of the EPSG file that ships with for instance mapserver, but where can I
> find the database you used here?
> 

www.epsg.org