[Qgis-user] Micro-Geometry Problems

[Hernán De Angelis]

Steve,

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!

Good luck!

H.


On 2020-01-14 22:51, smiller192 at cfl.rr.com wrote:
>
> All-
>
> 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.
>
> 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?
>
> Thanks,
>
> Steve Miler
>
>
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