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<div dir="ltr" data-setdir="false">Hi Byron,</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"> I recommend making one large polygon and then using the Split Features tool to cut individual polygons out of the original polygon. Just remember to select the polygon that you want to split before using the tool, and start and finish the split line on the outside of the polygon.</div><div dir="ltr" data-setdir="false"> This effectively eliminates topological errors between the adjacent polygons. Which means that there will not be any gaps or overlaps between them, since the splitting process will generate duplicate points in each polygon for every mouse click along the split path.<br></div><div dir="ltr" data-setdir="false"> The only disadvantage is that you will have to manually go back and fill in the attributes for each polygon. Know that the new polygon that is split from the original will inherit the attributes of the original.<br></div><div dir="ltr" data-setdir="false"> If you need to adjust boundaries later, you should use the Snapping Toolbar, specifically enable Snapping and enable Topological Editing. When polygons share points, if you move a point it will move all polygons that share that point.<br></div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">-Thayer<br></div><div><br></div><div><br></div>
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On Thursday, June 16, 2022 at 03:00:38 PM EDT, qgis-user-request@lists.osgeo.org <qgis-user-request@lists.osgeo.org> wrote:
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<div><br></div><div><div dir="ltr">Date: Thu, 16 Jun 2022 09:26:32 -0600<br></div><div dir="ltr">From: Firstname Lastname <<a href="mailto:byron@conjugategeo.com" rel="nofollow" target="_blank">byron@conjugategeo.com</a>><br></div><div dir="ltr">To: <a href="mailto:Qgis-user@lists.osgeo.org" rel="nofollow" target="_blank">Qgis-user@lists.osgeo.org</a><br></div><div dir="ltr">Subject: [Qgis-user] most efficient way to digitize polygons<br></div><div dir="ltr">Message-ID:<br></div><div dir="ltr"> <<a href="mailto:CAAyYZQJzTGyeR7zNoR8S-GTndAEUDx_tVLAWruK8Wd5_3dgJVw@mail.gmail.com" rel="nofollow" target="_blank">CAAyYZQJzTGyeR7zNoR8S-GTndAEUDx_tVLAWruK8Wd5_3dgJVw@mail.gmail.com</a>><br></div><div dir="ltr">Content-Type: text/plain; charset="utf-8"<br></div><div dir="ltr"><br></div><div dir="ltr">i am a qgis newby and i am beginning a large project that involves<br></div><div dir="ltr">digitizing several geology maps. i am trying to determine the best way to<br></div><div dir="ltr">manage the digitizing and avoid extra work.<br></div><div dir="ltr">my question to the group is: If i have several coloured polygons that are<br></div><div dir="ltr">adjacent to each other, is there an efficient way to digitize one polygon<br></div><div dir="ltr">and then use one edge of that polygon for the adjacent polygon so that i<br></div><div dir="ltr">dont have to redigitize the same edge twice and so that i will have<br></div><div dir="ltr">precisely overrlapping polys with no gaps? should i digitize one polygon,<br></div><div dir="ltr">export and rename it? can i digitize one have of the next polygon and<br></div><div dir="ltr">somehow merge it with the now re-imported polygon?<br></div><div dir="ltr">is there a more efficient way to do this?<br></div><div dir="ltr"><br></div><div dir="ltr">many thanks<br></div><div dir="ltr"><br></div><div dir="ltr">-- <br></div><div dir="ltr">Byron Veilleux, MSc. P.Geo<br></div><div dir="ltr">Conjugate Geologic Services Limited<br></div><div dir="ltr">Calgary, Alberta Canada<br></div><div dir="ltr"><a href="mailto:byron@conjugategeo.com" rel="nofollow" target="_blank">byron@conjugategeo.com</a><br></div><div dir="ltr">-------------- next part --------------<br></div><div dir="ltr">An HTML attachment was scrubbed...<br></div><div dir="ltr">URL: <<a href="http://lists.osgeo.org/pipermail/qgis-user/attachments/20220616/f37e9e02/attachment-0001.htm" rel="nofollow" target="_blank">http://lists.osgeo.org/pipermail/qgis-user/attachments/20220616/f37e9e02/attachment-0001.htm</a>><br></div><div dir="ltr"><br></div></div>
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