[Proj] PROJ.4 and local coordinate systems

joeri.theelen joeri.theelen at arts.kuleuven.be
Mon Aug 18 10:14:12 EDT 2008


Thanks for the tip: I do not use GRASS (yet), but I looked for a similar
transform module in SAGA GIS and found it. The module does what I need to
transform my files containing shapes in different formats.

Kind regards,

Maciej Sieczka wrote:
> joeri.theelen pisze:
>> 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.
> Joeri,
> As *it seems* there is no such functionality in PROJ, maybe you would be 
> ineterested in GRASS v.transform [1] module. You can load ASCII data 
> into GRASS with v.in.ascii.
> [1]http://grass.osgeo.org/grass64/manuals/html64_user/v.transform.html
> Maciek
> -- 
> Maciej Sieczka
> www.sieczka.org
> _______________________________________________
> Proj mailing list
> Proj at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/proj

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