<div dir="auto">Hello Byron,<div dir="auto"><br></div><div dir="auto">There are a couple of solutions I normally use in those situations.</div><div dir="auto"><br></div><div dir="auto">But before that take a look at the snapping documentation:</div><div dir="auto"><br></div><div dir="auto"><a href="https://docs.qgis.org/3.22/en/docs/user_manual/working_with_vector/editing_geometry_attributes.html#topological-editing">https://docs.qgis.org/3.22/en/docs/user_manual/working_with_vector/editing_geometry_attributes.html#topological-editing</a><br></div><div dir="auto"><br></div><div dir="auto">Also check the digitising on the layer properties to constantly validation:</div><div dir="auto"><br></div><div dir="auto"><a href="https://docs.qgis.org/3.22/en/docs/user_manual/working_with_vector/vector_properties.html#digitizingmenu">https://docs.qgis.org/3.22/en/docs/user_manual/working_with_vector/vector_properties.html#digitizingmenu</a><br></div><div dir="auto"><br></div><div dir="auto">Other than that, I normally prefer to create one by polygon and then split it with the split geometries tool, but make sure to enable topological editing.</div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto">The other option is using the avoid overlapping option, that way you can do just a few click in the inside an neighbours polygons and qgis will draw the boundary for yoy.</div><div dir="auto"><br></div><div dir="auto">Third option, use the tracing tool.</div><div dir="auto"><br></div><div dir="auto">Best regards,</div><div dir="auto"><br></div><div dir="auto">Alexandre Neto</div><div dir="auto">Users support</div><div dir="auto"><a href="http://www.qcooperative.net">www.qcooperative.net</a></div><div dir="auto"><br></div><div dir="auto"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">A quinta, 16/06/2022, 17:43, Nicolas Cadieux via Qgis-user <<a href="mailto:qgis-user@lists.osgeo.org" target="_blank" rel="noreferrer">qgis-user@lists.osgeo.org</a>> escreveu:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<p>Hi,</p>
<p>Depending on what you are doing and what kind of results you are
looking for, could you simply use "Polygonize" and then clean
those results. If your map are in RGB only, you could do a raster
classification analysis before hand. Line would follow pixels at
first but those could be fixed using various vector tools.</p>
<p>Just a thought!</p>
<p>Nicolas<br>
</p>
<div>On 2022-06-16 11:26 a.m., Firstname
Lastname via Qgis-user wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">i am a qgis newby and i am beginning a large
project that involves digitizing several geology maps. i am
trying to determine the best way to manage the digitizing and
avoid extra work.
<div>my question to the group is: If i have several coloured
polygons that are adjacent to each other, is there an
efficient way to digitize one polygon and then use one edge of
that polygon for the adjacent polygon so that i dont have to
redigitize the same edge twice and so that i will have
precisely overrlapping polys with no gaps? should i digitize
one polygon, export and rename it? can i digitize one have of
the next polygon and somehow merge it with the now re-imported
polygon? </div>
<div>is there a more efficient way to do this?</div>
<div><br>
</div>
<div>many thanks<br>
<div>
<div><br>
</div>
-- <br>
<div dir="ltr" data-smartmail="gmail_signature">
<div dir="ltr">Byron Veilleux, MSc. P.Geo
<div>Conjugate Geologic Services Limited</div>
<div>Calgary, Alberta Canada</div>
<div><a href="mailto:byron@conjugategeo.com" rel="noreferrer noreferrer" target="_blank">byron@conjugategeo.com</a></div>
<div><br>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
<fieldset></fieldset>
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</blockquote>
<pre cols="72">--
Nicolas Cadieux
<a href="https://gitlab.com/njacadieux" rel="noreferrer noreferrer" target="_blank">https://gitlab.com/njacadieux</a></pre>
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