About how to remedy these situations, you can use the v.clean GRASS provider algorithm, selecting the snap cleaning tool.
Kind Regards, Gabriel El mié., 15 de ene. de 2020 a la(s) 16:10, Gabriel De Luca ( pablogabrieldel...@gmail.com) escribió: > When digitizing, coordinates are taken from the canvas and stored to the > layer. If the canvas (project) CRS is not the same as the layer CRS, a > transformation and/or conversion must be done between the taken and stored > coordinates. That transformation and/or conversion performed between the > previous vertex to be rendered, and the rendered coordinate digitized to be > stored, may lead a round trip error. > > If you are digitizing from a canvas CRS to the same layer CRS, and > snapping to vertex, I think that you will not see any difference between > both vertices. > > If you are snapping to intersections, you can see a difference also > working in the same CRS for the canvas and the layer, because an > intersection calculated coordinate may not be a rational number and at some > decimal place it must be truncated. > > I don't know if any rendering option could truncate the coordinate of a > vertex when rendering it, so when snapping to that vertex (in the same CRS > for the canvas and the layer) could return a truncated coordinate for the > digitized vertex. > > El mar., 14 de ene. de 2020 a la(s) 18:59, <smiller...@cfl.rr.com> > escribió: > >> 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 >> _______________________________________________ >> Qgis-user mailing list >> Qgis-user@lists.osgeo.org >> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user >> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > >
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