[GRASS-dev] [GRASS GIS] #1988: towgs84 datum transform options not maintained with shapefile export

Casey Vandenberg casey.vandenberg at sjgeophysics.com
Mon Jun 3 16:43:17 PDT 2013

Thanks Hamish,

I assumed it needed to be looked at with GDAL/OGR first when exporting 
to a shapefile, I just wasn't sure if this was also the case when using 
g.proj -e.

On 13-06-03 04:19 PM, GRASS GIS wrote:
> #1988: towgs84 datum transform options not maintained with shapefile export
> --------------------------------+-------------------------------------------
>   Reporter:  voncasec            |       Owner:  grass-dev@…
>       Type:  defect              |      Status:  new
>   Priority:  normal              |   Milestone:  6.4.3
> Component:  Projections/Datums  |     Version:  unspecified
>   Keywords:  g.proj, v.out.ogr   |    Platform:  Linux
>        Cpu:  x86-64              |
> --------------------------------+-------------------------------------------
> Changes (by hamish):
>    * component:  Default => Projections/Datums
> Comment:
>   Yes, it's a known issue, and it needs to be solved in GDAL/OGR first. If I
>   recall correctly, WKT doesn't have a defined way to include datum
>   transforms, ISTR some time ago (older than that ticket) Frank suggested it
>   could be packed into something like a comment term, but then that would
>   only be known to other osgeo-stack software which knew to look for it.
>   Also, the proj4 epsg file includes explicit +towgs84 terms for some SRSs,
>   but others not (several options for the user to choose from under the
>   umbrella of the generalized code); the one referred to in the gdal ticket
>   (epsg:4632) is one of the ones with explicit +towgs84 terms in the epsg
>   def'n.
>   ?,
>   Hamish


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