[Gdal-dev] gdaltransform v.1.6.0 - result differs from documentation

[geep999]

Hi,
Thanks for the reply. I'm not sure that it's due to that change however. I just tried 1.5.1 and 1.5.2 too. They give the same result as 1.6.0. (I tried 1.4.1 too, but that doesn't have a gdaltransform command!).
1.5.1 is March 2008, and that predates the May 2008 change that you mention.

I wonder if it's due to some supporting library somewhere? I have geos-3.1.0, ogdi-3.1.6, proj-4.6.1.
I'd feel happier if somebody else can duplicate my result.

Cheers,
Peter

Looks like they may have added a towgs84 parameter to the proj definition
for 31370:

http://postgis.refractions.net/pipermail/postgis-commits/2008-May/000283.html

That would likely explain the shift - the documentation probably hasn't been
updated.

On Sat, Apr 18, 2009 at 1:53 PM, geep999 <geep999 at yahoo.co.uk> wrote:

>
> Hi,
> I have own-compiled gdal-1.6.0 on Linux - Slackware 12.2.
> The documentation for gdalwarp - http://www.gdal.org/gdaltransform.html  -
> shows
> an example and a result:
> Simple reprojection from one projected coordinate system to another:
> gdaltransform -s_srs EPSG:28992 -t_srs EPSG:31370
> 177502 311865
> Produces the following output in meters in the "Belge 1972 / Belgian
> Lambert 72" projection:
> 244510.77404604 166154.532871342 -1046.79270555763
>
> My gdaltransform (gdal-1.6.0) gives a different result:
> gdaltransform -s_srs EPSG:28992 -t_srs EPSG:31370
> 177502 311865
> 244422.238366377 165970.24545029 0
>
> Is the example wrong? Is my gdal-1.6.0 somehow faulty?
> Can anybody duplicate this or explain the difference?
>
> Cheers,
> Peter
> --
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