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<p>the projinfo-command was exactly what i needed but didn't know it
exists! the ogr2ogr -ct command works now, thank you very much!</p>
<p>could this example be added to the official examples on
<a class="moz-txt-link-freetext" href="https://gdal.org/programs/ogr2ogr.html#ogr2ogr">https://gdal.org/programs/ogr2ogr.html#ogr2ogr</a> ? i think the -ct
option is very useful and an example for it would be good. i could
also try to edit it on my own and send a pull request if that
helps</p>
<p>i just like to use the console if i can, QGIS has it's advantages
but if i have the option to use gdal directly or via a wrapper
like QGIS, i like to use gdal directly. this also saves me from
the pain when the wrapper does implement something wrong or uses
it's own functions instead of gdal, which in addition could change
every new version and need to be checked. using gdal directly is
much more reliable for me.</p>
<div class="moz-cite-prefix">Am 08.02.2021 um 22:18 schrieb Markus
Metz:<br>
</div>
<blockquote type="cite"
cite="mid:CAG+h=FGZJ3-VqUoHBs7LAi6M6eLhZ_MF0f4_a84qgVzdedA_ow@mail.gmail.com">
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<br>
On Mon, Feb 8, 2021 at 10:23 AM Karsten Tebling <<a
href="mailto:tebling@masuch.de" moz-do-not-send="true">tebling@masuch.de</a>>
wrote:<br>
><br>
> gdalinfo for NTv2LSBB_LSA.gsb gave the following
information:<br>
><br>
> Size is 256, 264<br>
> Coordinate System is: EPSG 4326<br>
> Origin: 10.5, 53.1<br>
> SYSTEM_F: S4283<br>
> SYSTEM_T: ETRS89<br>
> Upper Left 10.5, 53.1<br>
> Lower Left 10.5, 50.9<br>
> Upper Right 13.3, 53.1<br>
> Lower Right 13.3, 50.9<br>
><br>
> ogrinfo for punkte_31468.dxf gave the following
information:<br>
><br>
> Geometry: Unknown (any)<br>
> Feature Count: 36<br>
> Extent: (4523806.5, 5758974.7) - (4524134.7, 5759234.0)<br>
> Layer SRS WKT: (unknown)<br>
><br>
> according to QGIS punkte_31468.dxf should be at 11.6 52.1
which is inside the extent of the NTv2LSBB_LSA.gsb. after
checking the documentation for the NTv2LSBB_LSA.gsb i noticed i
couldn't use it for transformations from 31468 to 25833, that's
why i tried it with BETA2007.gsb instead, but it didn't work
either - it gave the same errors.<br>
><br>
> gdalinfo for BETA2007.gsb gave the following information:<br>
><br>
> Size is 62, 84<br>
> Coordinate System is: EPSG 4326<br>
> Origin: 5.4, 55.4<br>
> SYSTEM_F: DHDN90<br>
> SYSTEM_T: ETRS89<br>
> Upper Left 5.4, 55.4<br>
> Lower Left 5.4, 47.0<br>
> Upper Right 15.8, 55.4<br>
> Lower Right 15.6, 47.0<br>
><br>
> my adjusted code for BETA2007.gsb looks like:<br>
><br>
> ogr2ogr -s_srs "EPSG:31468" -t_srs "EPSG:25833" -dim XYZ
-ct "+proj=pipeline +step +inv +proj=tmerc +lat_0=0 +lon_0=12
+k=1 +x_0=4500000 +y_0=0 +ellps=bessel +step +proj=hgridshift
+grids=BETA2007.gsb +step +proj=utm +zone=33 +ellps=GRS80" -f
DXF punkte_25833.dxf punkte_31468.dxf<br>
><br>
<div>> the points i used to test this were digitized around
Magdeburg, Saxony-Anhalt in EPSG:31468. according to aerial
data and openstreetmap, the position and coordinate system are
correct when i check it in QGIS and switch to different
coordinate systems.</div>
<div><br>
</div>
<div>Wit PROJ 7.2.1 and <br>
</div>
<div>projinfo -o PROJ -s "EPSG:31468" -t "EPSG:25833"</div>
<div>I get</div>
<div>Operation No. 1:<br>
<br>
unknown id, Inverse of 3-degree Gauss-Kruger zone 4 + DHDN to
ETRS89 (8) + UTM zone 33N, 0.9 m, Germany - onshore - states
of Baden-Wurtemberg, Bayern, Berlin, Brandenburg, Bremen,
Hamburg, Hessen, Mecklenburg-Vorpommern, Niedersachsen,
Nordrhein-Westfalen, Rheinland-Pfalz, Saarland, Sachsen,
Sachsen-Anhalt, Schleswig-Holstein, Thuringen.<br>
<br>
PROJ string:<br>
+proj=pipeline<br>
+step +proj=axisswap +order=2,1<br>
+step +inv +proj=tmerc +lat_0=0 +lon_0=12 +k=1 +x_0=4500000
+y_0=0<br>
+ellps=bessel<br>
+step +proj=hgridshift +grids=de_adv_BETA2007.tif<br>
+step +proj=utm +zone=33 +ellps=GRS80<br>
<br>
-------------------------------------<br>
Operation No. 2:<br>
<br>
unknown id, Inverse of 3-degree Gauss-Kruger zone 4 + DHDN to
ETRS89 (2) + UTM zone 33N, 3 m, Germany - states of former
West Germany onshore - Baden-Wurtemberg, Bayern, Bremen,
Hamburg, Hessen, Niedersachsen, Nordrhein-Westfalen,
Rheinland-Pfalz, Saarland, Schleswig-Holstein.<br>
<br>
PROJ string:<br>
+proj=pipeline<br>
+step +proj=axisswap +order=2,1<br>
+step +inv +proj=tmerc +lat_0=0 +lon_0=12 +k=1 +x_0=4500000
+y_0=0<br>
+ellps=bessel<br>
+step +proj=push +v_3<br>
+step +proj=cart +ellps=bessel<br>
+step +proj=helmert +x=598.1 +y=73.7 +z=418.2 +rx=0.202
+ry=0.045 +rz=-2.455<br>
+s=6.7 +convention=position_vector<br>
+step +inv +proj=cart +ellps=GRS80<br>
+step +proj=pop +v_3<br>
+step +proj=utm +zone=33 +ellps=GRS80<br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>It seems your custom definitions of the coordinate
operation are missing the axis swap step "+step +proj=axisswap
+order=2,1".</div>
<div>According to "projinfo -o WKT2:2019 "EPSG:31468", northing
is the first axis in EPSG:31468, thus the need for the axis
swap.</div>
<div><br>
</div>
<div>If you trust the QGIS coordinate operation, then why do you
provide a custom coordinate operation to ogr2ogr with the -ct
option?</div>
<div><br>
</div>
><br>
> Am 06.02.2021 um 22:24 schrieb Markus Metz:<br>
><br>
><br>
><br>
> On Fri, Feb 5, 2021 at 3:40 PM Karsten Tebling <<a
href="mailto:tebling@masuch.de" moz-do-not-send="true">tebling@masuch.de</a>>
wrote:<br>
> ><br>
> > Hello,<br>
> ><br>
> > i'm struggling with how to use the -ct option in
ogr2ogr and could need<br>
> > some help.<br>
> ><br>
> > i copied a NTv2.gsb to osgeo4w64/share/proj and edited
the proj.db by<br>
> > inserting a new row in the grid_transformation-table.
using this<br>
> > transformation in qgis works. however when i try to
use it in ogr2ogr<br>
> > with the same data i always get "failed to reproject
feature (geometry<br>
> > probably out of source or destination srs). no known
way to write<br>
> > feature with geometry 'none'". here is my code:<br>
> ><br>
> > ogr2ogr -s_srs "EPSG:31468" -t_srs "EPSG:25833" -dim
XYZ -ct<br>
> > "+proj=pipeline +step +inv +proj=tmerc +lat_0=0
+lon_0=12 +k=1<br>
> > +x_0=4500000 +y_0=0 +ellps=bessel +step
+proj=hgridshift<br>
> > +grids=NTv2LSBB_LSA.gsb +step +proj=utm +zone=33
+ellps=GRS80" -f DXF<br>
> > punkte_25833.dxf punkte_31468.dxf<br>
> ><br>
><br>
> Is the grid NTv2LSBB_LSA.gsb used for hgridshift really
covering the full extent of punkte_31468.dxf ?<br>
> You can check with "gdalinfo NTv2LSBB_LSA.gsb" and "ogrinfo
-so punkte_31468.dxf".<br>
><br>
> Markus M<br>
><br>
> > i'm using the latest qgis-ltr and osgeo4w shell<br>
> ><br>
> > greetings<br>
> > _______________________________________________<br>
> > gdal-dev mailing list<br>
> > <a href="mailto:gdal-dev@lists.osgeo.org"
moz-do-not-send="true">gdal-dev@lists.osgeo.org</a><br>
> > <a
href="https://lists.osgeo.org/mailman/listinfo/gdal-dev"
moz-do-not-send="true">https://lists.osgeo.org/mailman/listinfo/gdal-dev</a></div>
</blockquote>
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