Questions tagged [slivers]

Questions related to identifying or removing polygon slivers.

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51
votes
10answers
53k views

Removing small spaces (slivers) between polygons? [closed]

I have a set of polygons representing administrative districts. The districts were digitized by hand, and there are small spaces (slivers) between polygons where the polygons should be touching. ...
12
votes
7answers
3k views

How to identify polygons with “flag” sliver errors

Working in ArcMap, I have come across errors in a polygon layer that I will call "flag slivers" (taken from similar language in parcels call "flag lots"). These sliver polygons (see image below) are ...
10
votes
1answer
844 views

Remove sliver gaps between polygons with R

Is there a way to eliminate the small "slivers" between polygons using R? The desired solution would create a new SpatialPolygonsDataFrame where the shared boundaries between polygons are coincident. ...
9
votes
5answers
705 views

Identifying “long and narrow” polygons in with PostGIS

I have a set of polygons representing large areas, say city neighborhoods. I want to identify the large overlapping areas between them. But there's a problem: sometimes these polygons will overlap ...
8
votes
3answers
4k views

Removing small polygon gaps in Shapely polygon?

I know this issue has been addressed before with different software, but how do I do it with Shapely? I have a polygon with a very small gap on the interior of the shape: Here is a close up: The ...
7
votes
2answers
2k views

Deleting small gaps (slivers) between polygons?

I try to delete the slivers that appeared when I have merged some polygons. I have two different cases: For the CASE 1, no problem I fill the gap with: CREATE OR REPLACE FUNCTION sliver_killer(...
6
votes
4answers
6k views

Remove slivers from merged polygons

I am creating a single polygon by merging different polygons in ArcMap. When I merge them, slivers are created. So I have to delete those slivers manually. I don't have a license for ArcInfo so tools ...
5
votes
2answers
867 views

In ArcGIS 9.3, how do I eliminate the slivers of missing data between polygons?

I am editing a single-band .tiff file in ArcGIS 9.3. I started with an image that I had to georeference, but unfortunately, the image had these little slivers of missing data between the data cells. ...
5
votes
2answers
5k views

Removing sliver polygons in ArcGIS Desktop?

I unioned 2 layers into 1 layer, and it created sliver polygons. I used the elimination tool to merge them with neighboring polygons. As as result, it merges all sliver polygons to only one polygon (...
5
votes
1answer
443 views

Deleting sliver polygons after difference operation in QGIS?

I'm trying to find the differing polygons between two layers in QGIS. After running the difference operation, however, I get results like this: I am only interested in the solid (blue) polygons, ...
5
votes
2answers
627 views

Using Check Geometries plugin for polygons in QGIS?

I've a few hundred polygon features with many duplicate nodes, gaps, overlaps and other geometry errors. Fixing all errors seems to be quite tricky. I had to run the duplicate nodes check twice to fix ...
4
votes
1answer
282 views

Making polygons “complete” in QGIS?

I've done the following process: take a set of points, each one representing a hotel with a field that says the "neighborhood" that the hotel is in (field is called "full_hierarchy") Performed SNN ...
4
votes
1answer
281 views

Fix slivers (Holes) between polygons ( generated after removing spikes)

I am trying to fix topological errors in this Shapefile of small areas of a state (Bahia) in Brazil. After applying prepair and PPrepair, the resulting shapefile has some spikes: It looks like a like ...
3
votes
1answer
144 views

Eliminate Sliver Polygons QGIS 3

I'm a regular user of the 'Eliminate Sliver Polygons' tool in QGIS. I've just switched from 2.18 to 3.4.4 and the 'Eliminate Sliver Polygons' tool isn't available. Has it been removed from this ...
3
votes
1answer
42 views

reshape coastline based on higher resolution ocean layer

I am trying to match one layer representing the land with another representing the ocean, they have the same coordinate system but they don't match because the resolution of the "ocean layer" is ...
3
votes
1answer
1k views

Explanation of the Thinness ratio formula?

I am looking for sliver polygons and am using the following formula to identify which polygons have a smaller area-to-circumference ratio (aka Thinness Ratio): 4 * pi * area/(length*length) That ...
3
votes
2answers
193 views

Automatically fill gaps and merge freshly generated polygons with the longest adjacent polygon

I get polylines automatically generated from AutoCAD from a colleague. Converting them into polygons with QGIS 3.6, I find out some sliver polygons and gaps in between, as shown in the picture below : ...
2
votes
2answers
580 views

Merging polygon slivers to largest adjacent polygon using ArcGIS Desktop?

I've got several hundred thousand slivers in my dataset as a result of cutting in a layer. Does anyone have a good solution as to how to have ArcGIS Desktop evaluate the position of each sliver and ...
2
votes
1answer
818 views

How to correct topology area boundary errors (slivers/gaps) on arcs in arcgis / arcsde

I use arcgis 10.1 (arcinfo licence) with arcsde to connect to a SQL Server database. The initial dataset has around 100k polygons (used for land registration, having a resolution that is around 1cm ...
2
votes
2answers
134 views

Fill slivers using R or SAGA GIS

I have polygon shapefile representing administrative districts. There are small spaces between polygons where the polygons should be touching. There are probably also overlapping polygons. How can I ...
2
votes
2answers
137 views

Close Slivers in Polygon

I am creating polygons from a text file and am having trouble with the polygons crossing the 180 degree line. The issue is creating rectangular polygons with a sliver cut out of it as seen here: I am ...
2
votes
0answers
59 views

Fixing Topology (Gaps and Overlaps) in QGIS

I am digitizing a new polygon shapefile of property boundaries based on orthoimagery using QGIS Zanzibar. I'm acquainted with topology editing in ArcMap using geodatabases. I did so with snapping to ...
2
votes
0answers
124 views

Removing slivers from IPolygon using ArcObjects?

ArcGIS Desktop Basic 10.1 with Spatial Analyst and 3D Analyst I have multiple neighboring polygons which I unionize. On occasion the result has slivers where the multiple polygons meet. I have been ...
2
votes
0answers
145 views

Finding gaps and overlaps in same feature class with Data Reviewer? [closed]

I am trying to find gaps and overlaps in the same feature class (e.g. political boundary) with Data Reviewer. The check I am using is Polygon Overlap/Gap Is Sliver (Feature on Feature Checks), and it ...
2
votes
0answers
184 views

How to avoid slivers when merging (union) two shapefiles in QGIS?

Here's the kind of tool I want: Preference A: Union the two polygon shapefiles that where the wetland file takes precedence over the forest file when the distance between the edges is less than 20m. ...
2
votes
0answers
656 views

Eliminate sliver polygons, not the enclaves

I would like to use the 'Eliminate sliver polygons' in QGIS, but only if they have the same attributes. To be more specific, I have an administrative shapefile that was created with the SEXTANTE tool ...
1
vote
3answers
2k views

Removing Slivers/Holes From Polygons using ArcGIS for Desktop?

I have a village level shapefile. Using Dissolve_management, I collapse the villages to district level. I also use Multi_Part option to prevent multiple entries for same polygon and so the resulting ...
1
vote
2answers
600 views

Filling spaces between polygons using ArcGIS Pro?

I have a polygon with 4 attributes (1,2,3 or 4). In the process of creating this polygon (merge/erase/union), there were gaps left between 1 and 2, with some of the gaps having slivers of 3 or 4. ...
1
vote
0answers
48 views

Reoccurring multipart / slivers / topology errors using file geodatabase?

Recently I had to hand in a FGDB to state authorities. I did all topology checks and corrections as defined in their specifications (see list below). My collegue did a cross check on a the same FGDB. ...
1
vote
1answer
85 views

How to identify Sliver triangles in a TIN surface and count them? [closed]

Is it possible to count slivers in a TIN? I generated a Delaunay triangulation surface model and i want to know how many slivers the TIN has.
1
vote
0answers
59 views

Tracking administrative changes with QGIS

I use QGIS. I have two shapefiles with the administrative boundaries in two differnet years. These boundaries have changed: some wards (smallest administrative area) remain the same, some are newly ...
0
votes
0answers
23 views

Union Tool creating slivers in ArcGIS Desktop?

I am using ArcGIS Desktop 10.4. I have 2 feature classes in the same GDB. One feature class is a subset of the other one (i.e. it's a direct copy, with a subset of features retained, the others ...
0
votes
0answers
87 views

Improving performance of Eliminate tool in ArcGIS Pro?

My data is very large (polygon feature class with 884187 features), thats why Python geoprocessing tools (which use geoprocesses like Intersect, Buffer etc.) don't work due to performance issues. So ...
0
votes
0answers
50 views

Removing Polygons Within Polygons After Merge (QGIS 2.18 OS X)

I've merged together a polygonized raster layer of a certain elevation grade (>25%) and a wetlands buffer. I can't seem to find a good solution to the problem at hand, however. Ultimately I'd like to ...
-2
votes
1answer
787 views

Sliver Polygon and its effect on GIS [closed]

I am new to the subject of GIS and I have been given this topic to prepare for a test. What I understand till now is that sliver polygon occurs when multiple layers are mapped incorrectly. Can someone ...