Eliminate
Feature Description
This tool merges small-area polygons into adjacent polygons with the largest area or longest shared boundary.
Typically used to simplify fragmented polygons generated after intersection, identity, update operations, or raster-to-vector conversions that fail to meet minimum mapping area requirements.
Parameter Description
| Parameter | Description | Type |
|---|---|---|
| Source Dataset | The input vector dataset for sliver polygon elimination. | DatasetVector |
| Sliver Polygon Area | Minimum area threshold (in square meters). Polygons smaller than this value will be considered sliver polygons for merging. | Double |
| Tolerances | Node snapping tolerance in source dataset units. Nodes within this distance will be merged during processing. Must be ≥0. | Double |
| Merge Mode (Optional) |
Specifies merging method: - Merge by Area: Merges sliver polygons into adjacent polygon with largest area - Merge by Shared Boundary: Merges sliver polygons into adjacent polygon with longest shared edge |
EliminateMode |
| Auto Delete Isolated Slivers (Optional) |
When enabled: Isolated slivers failing multiple merge attempts will be deleted. When disabled: Preserves isolated slivers. | Boolean |
| Group Field (Optional) |
Field defining merge groups. Polygons with identical field values will be grouped for merging. | String |
| Priority Field (Optional) |
Field(s) determining merge priority: 1. For multiple fields: Compare sequentially until unique match found 2. If no priority fields or no unique match: Merge to largest adjacent polygon |
String |
Output
| Parameter | Description | Type |
|---|---|---|
| Result Dataset | Output dataset containing merged polygons. | DatasetVector |
Notes
- Sliver polygons are generally defined as 1/1,000,000 to 1/10,000 of the largest polygon's area in dataset. Set appropriate area thresholds based on actual requirements. Improper tolerance settings may cause merge failures.
- Requires shared boundaries between polygons. Processing removes shared boundaries after merging.
- May reduce total feature count in output dataset.
Related Topics
Targeted Sliver Polygon Elimination