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Eliminates unwanted polygons (slivers) by merging them into the neighboring polygons or
- A polygon feature layer
- Selection method
- Attribute query - introduces the standard ArcGIS query builder. The user can select the
polygons to be eliminated using any query expression
- Thickness ratio is expressed as a ratio of the polygon area versus the area of its
minimal bounding square. The ratio will have value of 1 for a square. The smaller the value
is, the thinner the polygon is. It is a good way of identifying thin polygons (possible
- Circularity ratio - for a circle the circularity will be 1. The thinner the polygon is
the smaller the circularity will be. This is another way of identifying slivers
- Elimination method
- Delete - will delete all selected polygons (considered slivers)
- Join (Largest area) - will join selected polygons with neighboring polygons that
have the largest area
- Join (Longest boundary) - will join selected polygons with neighboring
polygons with the longest common border .
- Join to the neighbor with the same value
in the selected field as the sliver polygon.
- Identify - will record in the attribute table selected potential slivers. This allows
for visual inspection before proceeding with elimination.
- New polygon feature class with selected polygons eliminated or identified as slivers
- New field is added to the attribute table :
- The polygons not affected from elimination will have value - "Original"
- The slivers that were not eliminated will have value - "Sliver"
- The polygons that a sliver has been merged to - value - "Changed"
- If the source of the original data set is a feature class, to operation can be performed on
the original. If the source is a Coverage or Geodatabase, the only option is creating a
new feature class
- If the option "Calculate statistics" is selected, the next step will contain
valuable statistics - Min, Max and Mean values for the selected method (Thickness ratio or
circularity) that will help the user when assigning the ratio to be used for elimination
- Checked "Update Area and Perimeter" option will cause recalculation of the
Area and perimeter values. The rest of the original attributes are preserved
- Some of the very tiny slivers can be eliminated with the Clean
Polygon Wizard using appropriate value for Fuzzy tolerance, however eliminating larger
slivers using this method is not recommended since some unwanted approximation of the
polygon shapes might occur.
Eliminated with Largest Area option
Eliminated with Longest boundary option