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<p>Hi Elvin,</p>
<p>I do not know of any trick how to extract a road network from
images besides a trained image classification model. But may the
question be allowed why you can't just use the OpenStreetMap data
directly?</p>
<p>Cheers,<br>
Bernd<br>
</p>
<div class="moz-cite-prefix">Am 18.04.19 um 15:12 schrieb Elvin
Roldan:<br>
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<p class="MsoNormal">Hello:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I’m writing
because I’ve been a long time user QGIS and really
appreciate all the work that has been put to it and all the
initiatives to continue to evolve and maintain it as an
important open source GIS system.<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">My question
is aim does anybody know how to extract a road network using
spatial analysis tools within QGIS. I want to extract all
roads from aerial images to convert to vectors (polylines or
polygons) to do various analysis involving the existing road
network.<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">If anybody
can point me in the right direction I would appreciated. <o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Thanks.<o:p></o:p></p>
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<p class="MsoNormal">Elvin Roldán<o:p></o:p></p>
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