[Qgis-user] most efficient way to digitize polygons

[Alexandre Neto]

Hello Byron,

There are a couple of solutions I normally use in those situations.

But before that take a look at the snapping documentation:

https://docs.qgis.org/3.22/en/docs/user_manual/working_with_vector/editing_geometry_attributes.html#topological-editing

Also check the digitising on the layer properties to constantly validation:

https://docs.qgis.org/3.22/en/docs/user_manual/working_with_vector/vector_properties.html#digitizingmenu

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.


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.

Third option, use the tracing tool.

Best regards,

Alexandre Neto
Users support
www.qcooperative.net



A quinta, 16/06/2022, 17:43, Nicolas Cadieux via Qgis-user <
qgis-user at lists.osgeo.org> escreveu:

> Hi,
>
> 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.
>
> Just a thought!
>
> Nicolas
> On 2022-06-16 11:26 a.m., Firstname Lastname via Qgis-user wrote:
>
> 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
>
>
> _______________________________________________
> Qgis-user mailing listQgis-user at lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>
> --
> Nicolas Cadieuxhttps://gitlab.com/njacadieux
>
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20220617/7c072118/attachment.htm>