[Proj] +towgs84 approximation error

Clifford J Mugnier cjmce at lsu.edu
Wed Mar 22 20:31:00 EST 2017

Is that the rotation order or the matrix multiplication order?  :-). Whatever the order, the resultant direction cosine matrix remains the same, an orthogonal rotation matrix.

Sent from Cliff Mugnier's iPhone

> On Mar 22, 2017, at 8:16 PM, Jochem <jochem.lesparre at kadaster.nl> wrote:
> Hi Noel,
> My preference is Rz Ry Rx because this is how it is mentioned in my geodesy
> text books. This could be different in other countries (like positive and
> negative the rotation direction). The order Rz Ry Rx is also the order used
> by EPSG which is the source of most of the parameters used by PROJ.4. I
> think that is a good reason to keep to that order.
> Reference:
> http://www.iogp.org/pubs/373-07-2.pdf
> <http://www.iogp.org/pubs/373-07-2.pdf>   (page 134)
> Regards, Jochem 
> --
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