[Qgis-user] most efficient way to digitize polygons

[Thayer Young]

 Hi Byron,
  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.  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.
  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.
  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.

-Thayer


    On Thursday, June 16, 2022 at 03:00:38 PM EDT, qgis-user-request at lists.osgeo.org <qgis-user-request at lists.osgeo.org> wrote:  
 
Date: Thu, 16 Jun 2022 09:26:32 -0600
From: Firstname Lastname <byron at conjugategeo.com>
To: Qgis-user at lists.osgeo.org
Subject: [Qgis-user] most efficient way to digitize polygons
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    <CAAyYZQJzTGyeR7zNoR8S-GTndAEUDx_tVLAWruK8Wd5_3dgJVw at mail.gmail.com>
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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.
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?
is there a more efficient way to do this?

many thanks

-- 
Byron Veilleux, MSc. P.Geo
Conjugate Geologic Services Limited
Calgary, Alberta Canada
byron at conjugategeo.com
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