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<div class="moz-cite-prefix">Steve (or any new QGIS users),</div>
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<div class="moz-cite-prefix">For future reference, it is maybe better practice to digitise polygon sides simply as lines and then use one of the line>polygon tools in QGIS, GRASS or SAGA. Advantages are that you only digitise the lines once (much quicker,
no double digitising) and so only require to use snapping at junctions (less change of snapping errors). Main disadvantage is that you would have to add your polygon attribute data after the polygons have been generated rather than as you digitise them.</div>
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<div class="moz-cite-prefix">Regards,</div>
<div class="moz-cite-prefix">Mike</div>
<div class="moz-cite-prefix">GIS Cartographer</div>
<div class="moz-cite-prefix">University of Glasgow</div>
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<div class="moz-cite-prefix">On 16/01/2020 14:48, Kirk Schmidt wrote:<br>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi All:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This is a classic digitizing issue that can be corrected with GRAS as Harrisou suggests. If the layer does not get cleaned during the import process, you
can use the grass functions v.build and v.clean to fix the digitizing slivers and incomplete intersections.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Kirk Schmidt<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Qgis-user [<a class="moz-txt-link-freetext" href="mailto:qgis-user-bounces@lists.osgeo.org">mailto:qgis-user-bounces@lists.osgeo.org</a>]
<b>On Behalf Of </b>DelazJ<br>
<b>Sent:</b> Wednesday, January 15, 2020 3:45 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:dhdeangelis@comhem.se">
dhdeangelis@comhem.se</a><br>
<b>Cc:</b> qgis-user<br>
<b>Subject:</b> Re: [Qgis-user] Micro-Geometry Problems<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
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<p class="MsoNormal">There's also a "snap geometries to layer" Processing algorithm in QGIS that could be worth a look.<o:p></o:p></p>
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<p class="MsoNormal"><a href="https://docs.qgis.org/3.4/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#snap-geometries-to-layer" moz-do-not-send="true">https://docs.qgis.org/3.4/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#snap-geometries-to-layer</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Regards,<o:p></o:p></p>
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<p class="MsoNormal">Harrissou<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Le mer. 15 janv. 2020 à 08:34, Hernán De Angelis <<a href="mailto:dhdeangelis@comhem.se" moz-do-not-send="true">dhdeangelis@comhem.se</a>> a écrit :<o:p></o:p></p>
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<p>Steve,<o:p></o:p></p>
<p>In my opinion this is where GRASS topological vector model shines. One suggestion would be to import these vectors into a GRASS location and let GRASS clean the polygons and fix the topology automatically during import. My experience with similar problems
is that after the import and cleaning there would be few if any errors of the sort you mention. In the worst case any surviving error is found it could in principle be solved by deleting the stubborn surface and digitizing it again. It will definitely not
take two weeks of work!<o:p></o:p></p>
<p>Good luck!<o:p></o:p></p>
<p>H.<o:p></o:p></p>
<p><o:p> </o:p></p>
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<p class="MsoNormal">On 2020-01-14 22:51, <a href="mailto:smiller192@cfl.rr.com" target="_blank" moz-do-not-send="true">
smiller192@cfl.rr.com</a> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">All-<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">I have digitized a land use/land cover layer as individual polygons. The snap options were used and, for most vertices, the snap was precise. A vertex in polygon A has a precise
match to a vertex in neighboring polygon B.<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">But in 582 out of 2799 polygons, there are mis-matches in adjoining vertices that are only evident if you zoom into the layer at a magnification (i.e., a scale) of from 20000:1
to 40000 to 1. I have spent a couple of weeks trying to remedy these by hand using the Vertex Tool and other means. My question is this: is there an automated way in QIS to detect and remedy these situations?<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;margin-bottom:12.0pt">Thanks,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Steve Miler<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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