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<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Hi,<o:p></o:p></span></p>
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<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span lang="EN-US" style="font-size:10.0pt">The main question is why…</span><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p></o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">Those who have written the DXF driver (Frank Warmerdam, Alan Thomas, Even Rouault…) may know why but I guess that that their client did not have multipoints in their data, or they were
not willing to pay for something that they do not need. Multipoints are not so common in GIS. Open Source tends to work so that a developer writes something that is good enough for their own, or their customers’ needs. Then they put the results available for
others, who may find the code usable.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">-Jukka Rahkonen-<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>Lähettäjä:</b> Micha³ Kowalczuk <michkowalczuk@gmail.com>
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<b>Lähetetty:</b> torstai 16. tammikuuta 2025 10.11<br>
<b>Vastaanottaja:</b> Rahkonen Jukka <jukka.rahkonen@maanmittauslaitos.fi><br>
<b>Kopio:</b> gdal-dev@lists.osgeo.org<br>
<b>Aihe:</b> Re: [gdal-dev] DXF MLTIPOINT<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">Thank you, Jukka.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">I saw this post. The main question is why the DXF driver implementation can explode MultiPolylines and MultiPolygons (which is more complex) and MultiPoint
<b>not</b>? <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">Micha³ Kowalczuk<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">czw., 16 sty 2025 o 08:24 Rahkonen Jukka <<a href="mailto:jukka.rahkonen@maanmittauslaitos.fi">jukka.rahkonen@maanmittauslaitos.fi</a>> napisa³(a):<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">By this gis.stackexchange answer
<a href="https://gis.stackexchange.com/questions/336804/export-to-dxf-from-multipoint-z-geometry-in-postgresql-using-ogr2ogr" target="_blank">
https://gis.stackexchange.com/questions/336804/export-to-dxf-from-multipoint-z-geometry-in-postgresql-using-ogr2ogr</a> the main issue is in the DXF format that does not support MultiPoints. Try the workaround and explode your multipoints.<br>
About why it is allowed to create a geometry type that is not supported by the driver, I do not know if the validity of the geometry type is checked
<a href="https://gdal.org/en/stable/api/python/raster_api.html#osgeo.gdal.Dataset.CreateLayer" target="_blank">
https://gdal.org/en/stable/api/python/raster_api.html#osgeo.gdal.Dataset.CreateLayer</a> of if it up to user to know that, or if DXF is a special case.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">-Jukka Rahkonen-</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b>Lähettäjä:</b> gdal-dev <<a href="mailto:gdal-dev-bounces@lists.osgeo.org" target="_blank">gdal-dev-bounces@lists.osgeo.org</a>>
<b>Puolesta </b>Michal Kowalczuk via gdal-dev<br>
<b>Lähetetty:</b> torstai 16. tammikuuta 2025 8.56<br>
<b>Vastaanottaja:</b> <a href="mailto:gdal-dev@lists.osgeo.org" target="_blank">gdal-dev@lists.osgeo.org</a><br>
<b>Aihe:</b> [gdal-dev] DXF MLTIPOINT<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p><strong><span style="font-family:"Calibri",sans-serif;color:white">HUOM!</span></strong><span style="color:white"> Viesti on saapunut ulkopuolisesta osoitteesta. Älä avaa viestin linkkejä tai liitteitä, jos et tunnista lähettäjää.</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt">Hi,</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt">Does anyone know why DXF driver supports writing MutiLine and Multipolygon (make automatic conversion) but MultiPoint is not...?<br>
If so, why layer creation (<b><i>GDALDatasetCreateLayer</i></b>) with this geometry type (<b><i>wkbMultiPoint... </i></b>family) is allowed and the error occurs only when creating a feature on a layer (<b><i>OGR_L_CreateFeature</i></b>)?</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><i><span style="font-size:10.0pt">CPLError: No known way to write feature with geometry 'Multi Point'.</span></i></b><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt">The DXF driver documentation is silent about this type of geometry...</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt">Regards,</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt">Micha³ Kowalczuk</span><o:p></o:p></p>
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