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<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">I also tried the MVT driver and got the same problem : the output metadata.json only lists one layer.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Should I create all layers first before adding features to them ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">The C++ API documentation does not explain how to write several layers in the case of a MBTILES/MVT dataset<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="mso-fareast-language:FR">De :</span></b><span style="mso-fareast-language:FR"> DELEPINE Christophe
<br>
<b>Envoyé :</b> jeudi 30 juin 2022 17:17<br>
<b>À :</b> 'gdal-dev@lists.osgeo.org' <gdal-dev@lists.osgeo.org><br>
<b>Objet :</b> Creating a vector mbtile with several layers<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Hello<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I am trying to create a vector mbtile containing several layers (using C++ GDAL API) but it does not work. My output mbtile only contains one layer (ogrinfo only lists one layer)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">What I do is the following :<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF">GDALDriver</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black">* driver = (</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF">GDALDriver</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black">*)GDALGetDriverByName(</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#A31515">"MBTiles"</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black">);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF">GDALDataset</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black">* poDS = driver->Create(mbtiles.c_str(), 0, 0, 0,
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:darkslategray">GDT_Unknown</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black">, datasetCreationOptions);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:blue">for</span><span style="font-size:9.5pt;font-family:Consolas;color:black"> (</span><span style="font-size:9.5pt;font-family:Consolas;color:blue">auto</span><span style="font-size:9.5pt;font-family:Consolas;color:black">&
layer : </span><span style="font-size:9.5pt;font-family:Consolas;color:gray">layers</span><span style="font-size:9.5pt;font-family:Consolas;color:black">)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">{<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF">OGRLayer</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black">* oLayer = poDS->CreateLayer(layer.name_.c_str(), &srs3857_,
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:darkslategray">wkbUnknown</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black">);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:35.4pt;text-autospace:none"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF">OGRFeature</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black"> *oFeature =
</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:#2B91AF">OGRFeature</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black">::CreateFeature(oLayer->GetLayerDefn());<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:35.4pt;text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:black">oFeature->SetGeometryDirectly(geom);<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:35.4pt;text-autospace:none"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black">oLayer->CreateFeature(oFeature);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black">GDALClose(poDS);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:black">Any idea what is wrong ?</span><span lang="EN-US"><o:p></o:p></span></p>
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