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Why are there slivers between polygons in ArcGIS?
Tiny sliver polygons or gaps between polygons often result from creating new polygons without using snapping or editing shared boundaries without a topology. Slivers and gaps keep your dataset from forming a continuous fabric and should be identified and fixed as appropriate. There are several general ways…
How to get rid of gaps between polygons?
You can also use the Snap geoprocessing tool (requires ArcGIS for Desktop Standard or ArcGIS for Desktop Advanced) in the Editing toolbox. You can perform a Select By Attributes query for polygons that have an area smaller than a certain size, depending on your dataset.
How to find gaps and overlaps in ArcGIS?
You can choose to find both gaps and overlaps, only gaps, or only overlaps. The thinness ratio and polygon area can be used to define how large or small the gap or overlapping area can be in order for it to be considered a sliver. The check can be run on an entire feature class, a subtype, or a set of features selected using a SQL query.
Which is an example of a gap in a polygon?
For example, a gap might exist between a lake and grassland area. There can also be overlaps between features. For example, there could be a gap due to an overlap between a coastal water area and the foreshore due to an island. In both of these instances, the gap or overlapping area could be considered a sliver polygon.
Why do you need to remove slivers between polygons?
Removing slivers or gaps between polygons. Tiny sliver polygons or gaps between polygons often result from creating new polygons without using snapping or editing shared boundaries without a topology. Slivers and gaps keep your dataset from forming a continuous fabric and should be identified and fixed as appropriate.
How do you merge Slivers in ArcGIS editor?
You can inspect the selected polygons to see if they are slivers, then either use the Editor > Merge command or the Eliminate geoprocessing tool (requires an ArcGIS for Desktop Advanced license) to merge the slivers with neighboring polygons.
How to fix a geodatabase topology error in ArcGIS?
Create Feature: The Create Feature fix creates a new polygon feature out of the portion of overlap from the existing polygon so the boundary of each feature from both feature classes is the same. This fix can be applied to one or more selected Must Be Covered By Feature Class Of errors.
How to fix one must not overlap error in ArcGIS?
Merge: The Merge fix adds the portion of overlap from one feature and subtracts it from the others that are violating the rule. You need to pick the feature that receives the portion of overlap using the Merge dialog box. This fix can be applied to one Must Not Overlap error only.
Are there any predefined fixes for Topology rules?
Some topology rules, however, have no predefined fixes. Once you have discovered the topology errors, you can select the error on the map with the Fix Topology Error tool , or select the error from within the Error Inspector. For a poster of the available topology rules and examples of them, see the ArcGIS Geodatabase Topology Rules PDF.