[Proj] PROJ.4 and local coordinate systems

[support.mn at elisanet.fi]

Hello,

> By transformation, I
> mean translation, rotation and dilation (scale factor) of the X/Y
> coordinates only, not height.

there is the possibility to use datums. What you just wrote is a datum
definition. You define a datum for both systems relative to the wgs84
and proj-4 should automatically transform your coordinates.. ??

if the coordinate values do not match to any standard, just define your
own false easting and false northing values so that the resulting values
are better.. ??

Regards: Janne.

-------------------------------------

"joeri.theelen" <joeri.theelen at arts.kuleuven.be> kirjoitti: 
> 
> Hi,
> 
> Is it possible to use PROJ.4 or any of its related tools to transform
> coordinates from a local carthesian system into another local carthesian
> system (thus both are not earth related).
> 
> I inherit lots of datasets in many different formats for an archaeological
> site, with coordinates measured in two different local systems (shift in
> time). I managed to get the transformation parameters to transform sets of
> coordinates between both systems, with minor error. By transformation, I
> mean translation, rotation and dilation (scale factor) of the X/Y
> coordinates only, not height.
> 
> I also managed to get the transformation parameters from both local systems
> to the UTM system in use in that area. Thus, transforming from local to UTM
> to local would be an option as well.
> 
> Can anybody help me with this? I know programming such a tranformation would
> be trivial, but I need the power and flexibility of a tool like "cs2cs" to
> cope with the many different formats I am facing.
> 
> Thank you,
> Joeri
> -- 
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> 
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