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<p class=MsoNormal><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Hi Uwe,<o:p></o:p></span></p>
<p class=MsoNormal><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class=MsoNormal><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Thanks for your reply. The l0.tif file does not contain any
georeferenced information. However, I have run the GDALINFO command on another
raster data file which is in the same map data set provided by the customer and
hence is supposed to be georeferenced in the way as the l0.tif file. The
command output is sent as attached. As mentioned before, I also did the NTv2
transformation on this raster data file (Notrufzonen_50m_v11_6_EPOS.tif) with
the same GDALWARP command and the same grid shift file. I also got a lot of
error messages saying that some coordinates are outside the area of the grid
shift file. And with the “+x_0=500000” parameter, the output error
messages are much less than the ones with the “+x_0=4500000” parameter.<o:p></o:p></span></p>
<p class=MsoNormal><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class=MsoNormal><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Thanks for your help again.<o:p></o:p></span></p>
<p class=MsoNormal><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class=MsoNormal><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">BR,<o:p></o:p></span></p>
<p class=MsoNormal><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Heng<o:p></o:p></span></p>
<p class=MsoNormal><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class=MsoNormal><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Schmitz, Uwe [via
OSGeo.org] [mailto:<a href="/user/SendEmail.jtp?type=node&node=5859107&i=0" target="_top" rel="nofollow">[hidden email]</a>] <br>
<b>Sent:</b> 20 December 2010 18:51<br>
<b>To:</b> Heng Feng<br>
<b>Subject:</b> AW: [gdal-dev] An issue about using GDALWARP to do
theNTv2transformation<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Heng, <o:p></o:p></p>
<div>
<p class=MsoNormal><br>
> <br>
> <br>
> <a href="http://osgeo-org.1803224.n2.nabble.com/file/n5848200/gdalwarp_?by-user=t&by-user=t" target="_top" rel="nofollow" link="external">http://osgeo-org.1803224.n2.nabble.com/file/n5848200/gdalwarp_</a><br>
> problem1.doc <br>
> gdalwarp_problem1.doc <br>
> Hi Uwe, <br>
> <br>
> I have tried your suggestion on the same raster file with a modified <br>
> "+x_0=500000" parameter in the command line (as seen in the <br>
> attached doc). I <br>
> could see the major difference:there is still one error <br>
> message left. When I <br>
> tried on another raster file with the same modified <br>
> parameter, I have got <br>
> much less error messages than before. However, is it still <br>
> possible that my <br>
> raster data are outside the area of the grid shift file? All <br>
> the raster data <br>
> I was trying to transform are GK (DHDN) zone 4, which false <br>
> easting value is <br>
> 4500000. This was why I used "+x_0=4500000" instead of <br>
> "+x_0=500000" in the <br>
> command line. As I am getting to know all these georeference <br>
> settings at the <br>
> moment, can you tell me why you suggested the modified <br>
> parameter and what <br>
> you meant about "raster data lacks the Gauss-Krueger meridian
prefix"? <br>
> <o:p></o:p></p>
</div>
<p class=MsoNormal style="margin-bottom:12.0pt">that was just a guess, because
your coordinates lie far in the <br>
west of DHDN/GK zone 4. <br>
Normally DHDN/GK coordinates are noted as e.g.: <br>
4500000.0 Rechts 5500000.0 Hoch <br>
<br>
Omitting the Gauss-Krueger meridian prefix you have: <br>
500000.0 Rechts 5500000.0 Hoch <br>
(Note: Rechts coordinate has only six digits) an thats <br>
far in the west of the real position. It's very simple and <br>
therefore you may give it a try. <br>
<br>
If it's not the case, may be you can post the output of: <br>
gdalinfo l0.tif <br>
<br>
That would help to see, if the file is correctly georeferenced. <br>
<br>
Regards <br>
Uwe <br>
_______________________________________________ <br>
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<o:p></o:p></p>
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