[Gdal-dev] need tools for TIF image reprojection

[Zhonghai Wang]

Hi Petteri,

unfortunately not, the reprojected tif image has always the same
displacement. I think the problem occurs between the transformation from
Swiss National System (CH1903) to WGS84 system.

thanks you for your advice

Best Regards

zhonghai


On 7/14/06, Zhonghai Wang <zhonghaiw at gmail.com> wrote:
>
>  Hi Petteri,
>
> I hope the old version will work fine for the reprojection. I am going to
> try it now. Thanks for this important info.
>
> kind regards
>
> zhonghai
>
>
> On 7/14/06, Petteri Packalen <packalen at cs.joensuu.fi> wrote:
> >
> > Hi,
> >
> > http://iweb.gdal.org/dl/fwtools/
> >
> > and then download a6 version according your OS. I used Windows version.
> >
> > Best regards,
> > Petteri
> >
> > On Fri, 14 Jul 2006, Zhonghai Wang wrote:
> >
> > > Hi Petteri,
> > >
> > > I am using the latest version FWTools1.0.5, which version do you mean?
> > > FWTools a6? never heard.
> > >
> > > if possible, can you give me a link for the version you mentioned?
> > >
> > > thanks a lot
> > >
> > > zhonghai
> > >
> > > On 7/14/06, Petteri Packalen < packalen at cs.joensuu.fi> wrote:
> > >>
> > >> Hi,
> > >>
> > >> This just a guess: what version of GDAL are you using? I had similar
> > kind
> > >> of problem about one month ago before I left to summer holiday. I
> > >> downloaded the newest FWTools version and when I tried to transform
> > some
> > >> images from Finnish kkj to EUREF FIN coordinate system datum shift
> > was not
> > >> applied. EUREF FIN is basically ETRS89 / UTM 35N. When I revert back
> > to
> > >> FTTools alpha 6 everything worked propely. I don't remember what was
> > >> actual gdal versions in these FWTools releases. Please try FWTools a6
> > if
> > >> possible.
> > >>
> > >> I didn't remember to fill a bug report. I will look at it later when
> > I
> > >> come back to office.
> > >>
> > >> Best regards,
> > >> Petteri
> > >>
> > >> On Fri, 14 Jul 2006, Zhonghai Wang wrote:
> > >>
> > >> > Hi Andrew,
> > >> >
> > >> > you are right, in the most cases the GDAL utilities work well, and
> > I've
> > >> also
> > >> > use the GDAL utilities for a long time, especially the FWTools made
> > by
> > >> > Frank, we should all thank Frank for such a wonderful GIS toolkit.
> > >> >
> > >> > I've check again and again with the GDALWARP, but things are not
> > going
> > >> in
> > >> > the right way. I am trying to translate the TIF images from the
> > >> coordinate
> > >> > system CH1903 (Swiss National System) to ETRS89 / UTM ZONE 32N, and
> > >> there
> > >> > are always  some displacement with the base maps, I am sure that
> > the
> > >> base
> > >> > map and the original coordinate info for the TIF is correct. and
> > here is
> > >> an
> > >> > example:
> > >> >
> > >> > (the transforming process is : CH1903 -> WGS84 -> ETRS89 / UTM ZONE
> > 32N)
> > >> >
> > >> > the TIF image coordinate Info (*.tif): (Swiss National System)
> > >> > 0.500000
> > >> > 0.000000
> > >> > 0.000000
> > >> > -0.500000
> > >> > 598125.250000
> > >> > 199999.750000
> > >> >
> > >> > If I transform the coordinate to WGS84 with GDAL, the value is:
> > >> >
> > >> > 0.0000059839
> > >> > 0.0000000000
> > >> > 0.0000000000
> > >> > -0.0000059839
> > >> > 7.4149523128
> > >> > 46.9529994915
> > >> >
> > >> > but the lon/lat of the upper left corner should be:
> > >> >
> > >> > 7.41401039348263
> > >> > 46.9510762167473
> > >> >
> > >> > I would say that this is already big difference, because If I use
> > this
> > >> > lon/lat to get the UTM coordinate, this small difference will be
> > >> propagated,
> > >> > and will cause a displacement about hundreds meters.
> > >> >
> > >> > I am trying to find the source code, which does this coordinate
> > >> > transformation, so that I can check if the transformation
> > parameters are
> > >> > correct, but unfortunately I can not find the source for this.
> > >> >
> > >> >
> > >> > If someone has done something similar, please point me out how to
> > fix
> > >> this
> > >> > problem, especially the GIS people in Switzerland. I would really
> > >> appreciate
> > >> > it.
> > >> >
> > >> > zhonghai
> > >> >
> > >> > On 7/14/06, Andrew Williams < awilliams at rapidmap.com.au> wrote:
> > >> >>
> > >> >> zhonghai,
> > >> >> I've litterally translated hundereds of TIF's from all over the
> > world
> > >> from
> > >> >> multiple projections to multiple projections. I have also had
> > >> "failures".
> > >> >> However, in every case, it was either my fault in specifying the
> > -s_srs
> > >> or
> > >> >> -t_srs. In some cases the fault lay in the original image. The
> > TIFF
> > >> itself
> > >> >> was supplied with incorrect georefernceing information and so it
> > was
> > >> never
> > >> >> going to work.
> > >> >>
> > >> >> Have you got a dump from GDALINFO that we can see and the GDALwarp
> > >> command
> > >> >> line you've used?
> > >> >>
> > >> >> regards
> > >> >> Andrew
> > >> >>
> > >> >>        -----Original Message-----
> > >> >>        From: Zhonghai Wang [mailto: zhonghaiw at gmail.com]
> > >> >>        Sent: Fri 7/14/2006 12:14 AM
> > >> >>        To: gdal-dev at lists.maptools.org
> > >> >>        Cc:
> > >> >>        Subject: [Gdal-dev] need tools for TIF image reprojection
> > >> >>
> > >> >>
> > >> >>        Hi guys,
> > >> >>
> > >> >>        I need a tool to reproject my TIF images, either free or
> > >> non-free
> > >> >> software.
> > >> >>        I've tried with the GDAL utilities, sure I can do the
> > >> reprojection,
> > >> >> but the coordinates seems not correct, there are serveral hundert
> > >> meters
> > >> >> displacement according to the my base maps.
> > >> >>
> > >> >>        thanks for your info.
> > >> >>
> > >> >>        zhonghai
> > >> >>
> > >> >>
> > >> >>
> > >> >>
> > >> >
> > >>
> > >
> >
>
>
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