[Proj] Setting up a proj4 specification

Mikael Rittri Mikael.Rittri at carmenta.com
Wed Oct 19 08:58:21 EST 2011

PS again:

The AFREF newsletter No.5, January 2008,


publishes what they call a "Molodensky-Badekas 7-Parameters transformation" 
that is "between WGS 84 and Arc 1960 datum for Kenya". I think that means that
the published transformation goes in the direction from WGS 84 to Arc 1960. 
So one would need to reverse the signs of all parameters for use in Proj.4.

Also, I think "Molodensky-Badekas" usually means that the rotation sign
convention is Coordinate Frame Rotation, while Proj.4 uses the opposite 
Position Vector Transformation.  If I am right, the signs of the rotation 
parameters must be reversed once more!  

If I am not mistaken, the Proj.4 syntax for the transformation should be 



Mikael Rittri

-----Original Message-----
From: Mikael Rittri 
Sent: Wednesday, October 19, 2011 12:55 PM
To: 'PROJ.4 and general Projections Discussions'
Subject: RE: [Proj] Setting up a proj4 specification


Another datum shift for Arc 1960 to WGS 84 in Kenya is 


which is probably more accurate. See Clifford Mugnier's column on Kenya, 



Mikael Rittri

-----Original Message-----
From: proj-bounces at lists.maptools.org [mailto:proj-bounces at lists.maptools.org] On Behalf Of Mikael Rittri
Sent: Wednesday, October 19, 2011 11:10 AM
To: PROJ.4 and general Projections Discussions
Subject: Re: [Proj] Setting up a proj4 specification

Hello, Hanlie.

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