[PROJ] Axis Order in Custom Projection

[Paul Harwood]

Thanks, I'll check it out.

On Thu, 9 Jul 2020 at 15:25, Even Rouault <even.rouault at spatialys.com>
wrote:

> Paul,
>
>
>
> you could do that by building a pipeline
>
> ( https://proj.org/operations/pipeline.html )
>
> chaining the tmerc projection with a axisswap operation
>
> ( https://proj.org/operations/conversions/axisswap.html )
>
>
>
> Even
>
>
>
>
>
> > Hi
>
> >
>
> > I am working on a project to put GIS data into VR in Unity (see
> virgis.org
>
> > for more info - very early stages).
>
> >
>
> > I am using Proj to convert Geospatial data into internal VR Space
>
> > coordinates for a model. I did this by defining a custom projection for
> the
>
> > internal model space ( of the form of "+proj=tmerc +datum=WGS84 +units=m
>
> > +no-defs +lat_0=53.316200583246534 +lon_0=-1.791218230167096" where the
>
> > lat_0 and lon_0 figures depend on the location of the model.).
>
> >
>
> > This is working well in both directions.
>
> >
>
> > However - one constant and annoying fact is that whilst all Geospatial
> CRS
>
> > are "Z-up" i.e. altitude is the Z dimension, VR space is "Y-up". It is
>
> > a purely procedural thing to swap the axis but it is a constant
>
> > irritation and cause of failures!
>
> >
>
> > The ideal solution would be if the Proj coordinate operation produced
>
> > coordinates in "eun" axis order! Would solve a lot of problems. I did try
>
> > this to see if it was possible but (not unsurprisingly) got an error.
>
> >
>
> > Is there any way to do this? Or is it so far from the expected usage that
>
> > it is just not possible?
>
> >
>
> > Thanks in advanced for any and all comments.
>
>
>
>
>
> --
>
> Spatialys - Geospatial professional services
>
> http://www.spatialys.com
>
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