[gdal-dev] gdaltransform results differs from qgis

[Antonio Parrotta]

I downloaded the source from http://download.osgeo.org/gdal/gdal152.zip,
built on windows XP with VC2008 with and PROJ4 dll from
http://download.osgeo.org/proj/proj446_win32_bin.zip

any clue

Antonio

2008/9/15 Markus Neteler <neteler at osgeo.org>

> On Mon, Sep 15, 2008 at 11:02 AM, Antonio Parrotta
> <antonioparrotta at gmail.com> wrote:
> > Hi All,
> >
> > I'm facing in  strange result using gdaltransform. What I'm doing is to
> try
> > to trasform coordinates from WGS84 to Gauss-Boaga:
> >
> > gdaltransform.exe -s_srs "WGS84" -t_srs "+proj=tmerc +ellps=intl +lat_0=0
> > +lon_0=9 +k=0.9996 +x_0=1500000 +y_0=0 +units=m
> > +towgs84=-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68"
> > entering lon and lat
> >>7,69746 45,106977<enter>
> > it gives
> > 1342393.88434212 4984915.97865081 -47.0342488819733
> > doing the same transformation with qgis (same parameters), I have
> > 1397559,446 4995677,02
> > that is quite near to the target expected also checking out in map.
> >
> > Do we know the reason of this delta? Do I have to set any other
> correction
> > parameter?
>
>
> Using cs2cs from PROJ4 Rel. 4.6.1, 21 July 2008, I get:
>
> cs2cs -v  +proj=latlong +datum=WGS84 +to +init=epsg:3003
> +towgs84=-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68
> # ---- From Coordinate System ----
> #Lat/long (Geodetic alias)
> #
> # +proj=latlong +datum=WGS84 +ellps=WGS84 +towgs84=0,0,0
> # ---- To Coordinate System ----
> #Transverse Mercator
> #       Cyl, Sph&Ell
> # +init=epsg:3003 +towgs84=-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68
> # +no_defs +proj=tmerc +lat_0=0 +lon_0=9 +k=0.9996 +x_0=1500000 +y_0=0
> # +ellps=intl +units=m
> #--- following specified but NOT used
> # +no_defs
> 7.69746 45.106977
> 1397556.77      4995679.28 -46.70
>
> Using gdaltransform on Linux (almost current SVN), I get:
> gdaltransform -s_srs "WGS84" -t_srs "+proj=tmerc +ellps=intl +lat_0=0 \
>   +lon_0=9 +k=0.9996 +x_0=1500000 +y_0=0 +units=m \
>  +towgs84=-104.1,-49.1,-9.9,0.971,-2.917,0.714,-11.68"
> 7.69746 45.106977
> 1397556.76994996 4995679.27916302 -46.6971342787147
>
> which is the same as the cs2cs output.
>
> How old is your gdaltransform.exe and where does it originate from?
>
> Markus
>
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