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Questions tagged [ring]

The tag has no usage guidance.

1
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1answer
23 views

Polygon node order will not correct [duplicate]

I've got a few polygons (they were previously one multipolygon) which seem to insist on having an anticlockwise node order. As such, when running through various operations in SQL, they throw out the ...
1
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0answers
43 views

How to enable tracing in QGIS 3 beyond applications for adding polygon purposes?

I have used the enable tracing feature in QGIS 3 to create new polygons (Add polygon feature), and it works very well. However, i have not been able to use it for other purposes beyond that, for ...
1
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2answers
337 views

Add ring and Fill Ring error: could not add ring since the inserted Ring is not contained in a feature

I'm new to QGIS and am struggling a bit, I'm using the 2.18 version on a Mac OSX Yosemite. I'm trying to add a ring to create a geological map, I was successful for most of the map, but suddenly it ...
1
vote
1answer
184 views

Polygon holes/rings are showing up as polygons in QGIS

I am having an issue in both QGIS 2.18.17 and QGIS 3.0.1. It is to do with holes/rings. Where there are meant to be holes/rings, actual polygons are showing, these are effectively coming in as ...
7
votes
1answer
2k views

How to fix polygon with ring self intersection in QGIS?

When I polygonize a raster, I very often have 'pixels' holes/interior ring that touche exterior ring. Example : POLYGON((5 0, 10 0, 10 10, 0 10, 0 0, 5 0, 3 3, 5 6, 7 3, 5 0)) It's defined as an ...
6
votes
2answers
162 views

Is there any tool in QGIS to select and translate an inner ring without altering it nor the rest of the polygon?

I want to highlight the cloudfree pixels of a satellite image of which both of it with the cloudmask had been imported and reprojected from another GIS software. Because of the reprojection, my ...
2
votes
0answers
86 views

arcobjects modify vertices coordinate in both interior ring and exterior ring

I have a multiple parts polygon and I want to move all vertices of this polygon. I use exteriorRingPointCollection and interiorRingPointCollection to get all vertices. But I cannot get the result I ...
1
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0answers
67 views

Incorrect results returning from st_distance_spheroid query

Given a routable network table constructed by completing the guide at http://anitagraser.com/2011/02/07/a-beginners-guide-to-pgrouting/, how can I get an accurate list of all roads that are within a ...
1
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3answers
704 views

Creating rings from existing polygons using QGIS?

I have been given a shapefile from a client that features pivots, yet they were recorded as 10 circles overlapping. The software my company uses requires that these polygons be rings that don't ...
4
votes
1answer
93 views

Geoprocessing tools fail though CRS same, prj-file ok, edit mode off, topology valid, etc

For my layers none of the QGIS geoproccesing tools (difference, intersection, etc. all give empty attribute tables) work, though I've checked for all (?) error sources (as in the title). Then I tried ...