[GIS] How to clean up a polygon by removing vertices and lines within

arcmappolygonvertices

After merging a set of shapefiles I've ended up with polygons that have vertices and lines within them. Is there a simple tool to remove these vertices and clean the polygon in ArcMap 10.2?

I realise the same question has been asked here, but it does not state the GIS-program and I cannot find the tool mentioned in the answer (delete ring in the advanced digitising toolbar).

EDIT: when zooming in very far, the lines and dots appear to be tiny triangles. They are not separate features, but holes in the polygons that arose from merging polygons that had not been lined up nicely. I am now looking for a way to repair there holes.

I reckon there is a simple tool to do this, but I cannot seem to find it.

example_slivers
example_hole

Best Answer

In order to solve your problem:

Create a FileGeodatabase
In the FileGeodatabase create a FeatureDataset
Import the shape in the FeatureDataset
In the FeatureDataset create a Topology
In the wizard choose next and in the Rules page click Add Rule
Select "Must Not Overlap" or "Must Not Have Gaps", check "Show Errors" and click OK.
Complete the wizard and validate the topology.
Open the topolgy in ArcMap, you can see the errors
Start editing and open the Topology toolbar
On the Topolgy toolbar click on "Error Inspector"

At this time you can edit the feature class to remove errors.

Related Solutions

QGIS – How to Split All Lines in Layer at Vertices

Try the "Explode lines" from the Processing Toolbox (Ctrl+Alt+T) will split all lines at their vertices to separate lines.

Menu Processing -> Toolbox. Type "explode" into the search field to find the function. Select your line layer from the dropdown and start. This will produce a new layer.

Selecting one or more lines from the line layer will produce a splitted layer with only these features, discarding the rest.

Note: As QGIS is moving fast, all infos below are outdated already.

I think Explode lines would be the the noob-solution through the SEXTANTE toolbox. QGIS Geoalgorithms > Vector geometry tools > Explode lines. Unfortunately, it does not seem to work at the moment, i get an error message only.
Traceback (most recent call last):
  File "path/.qgis//python/plugins\sextante\core\GeoAlgorithm.py", line 145, in execute
    self.processAlgorithm(progress)
  File "path/.qgis//python/plugins\sextante\algs\Explode.py", line 58, in processAlgorithm
    features = QGisLayers.features(layer)
NameError: global name 'layer' is not defined
A working solution is the Split Feature-Plugin from the "contributed" repository, which does the job for me.

In general I prefer sextante functions over separate plugins, cause the workflow with sextante is so much faster and produces no junk-files of intermediate steps (provided it works).

EDIT: Unfortunately, a lot of plugins were not moved to the official plugin repository yet, but are still only available through the "contributed" plugin repository: http://pyqgis.org/repo/contributed, which was removed from the default repositories list with version 1.8.

There you can download them individually and unzip them in your .qgis/python/plugins folder OR you add this address to your plugins repository list: Plugins -> Fetch python plugins -> Tab "Repositories" -> Add ... -> enter a name and the url.

[GIS] Removing vertices or lines within polygon using QGIS

Those lines and vertices are actually holes or islands on your polygon.

Try using the delete part or delete ring tools in the advanced digitizing toolbar, and click on one of the nodes. I have noticed that sometimes you need to drag one or more nodes a bit to be able to click on the hole\island boundaries to delete it.

Best Answer

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QGIS – How to Split All Lines in Layer at Vertices

[GIS] Removing vertices or lines within polygon using QGIS

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