[Qgis-user] How do I clean up this geometry?

[Phil Wyatt]

I spotted at least one other anomaly

 



 

Bottom left of this object has a long sliver that you might want to remove

 



 

Cheers

 

 

From: Qgis-user <qgis-user-bounces at lists.osgeo.org> On Behalf Of qgis-user at stripfamily.net
Sent: Saturday, 9 January 2021 7:28 AM
To: qgis-user <qgis-user at lists.osgeo.org>
Subject: [Qgis-user] How do I clean up this geometry?

 

This linked <https://drive.google.com/file/d/1o1KthonUPSZGWp6QImS9btbj799Lv-om/view?usp=sharing>  file, proclaimed.zip, is the boundary of the Santa Fe National Forest as supplied by the USFS.
If you focus on this area




There is some problematic geometry. If I do a dissolve I get this:



If I remove the holes, I'm left with this bit of stray boundary:


I then remove that with edit nodes. But the resulting polygon is still not clean  - if I try to use the field calculator to add the area (using $area), I get null.
There is bad geometry that I'm not spotting, but how do I find it?


The second linked  <https://drive.google.com/file/d/1ul60p0rSdwKcmt6zUivSMIPQHXYc_rcT/view?usp=sharing> file, clean.zip, is the result of the steps above.




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