id: eliminatespecifiedregions title: Sliver Polygon Merge for Specified Objects
Feature Description
During data production and processing, small and useless polygons (sliver polygons) often emerge. This tool simplifies data by merging specified sliver polygons (via ID) into adjacent polygons with the largest area or longest shared boundaries.
Application Scenarios
Operations like intersection, identity, update, and raster-to-vector conversion may generate excessive sliver polygons that fail to meet minimum mapping area requirements. Use this tool to merge qualifying sliver polygons into adjacent larger polygons through two steps:
First, identify target sliver polygon IDs using the Extract Object IDs tool. Then pass these IDs to the Sliver Polygon Merge for Specified Objects tool via joins to complete the merge operation.
Parameter Description
| Parameter | Description | Type |
|---|---|---|
| Source Dataset | Input vector polygon dataset. | DatasetVector |
| IDs of Sliver Polygons to Merge | Specify IDs of sliver polygons for merging. Eligible polygons will be merged into adjacent polygons. | Integer |
| Excluded Polygon IDs (Optional) |
Specify polygon IDs to exclude from merging. | Integer |
| Group Field (Optional) |
Field name for grouping. Objects with identical field values form a group and can be merged. | String |
| Priority Merge Field(s) (Optional) |
Priority field(s) for merging (effective when Group Field is specified). 1. When multiple fields are specified, comparison follows field order. Merge occurs with uniquely matched adjacent polygons based on highest-priority field values. 2. If no unique match exists or no priority fields are specified, merge follows maximum area principle. |
String |
| Merge by Longest Boundary (Optional) |
When checked, merges sliver polygons into adjacent polygons with longest shared boundaries. Otherwise uses maximum area principle. | Boolean |
| Tolerances | Node tolerance value in source dataset units. Nodes within tolerance distance will merge. Must be ≥0. | Double |
Output
| Parameter | Description | Type |
|---|---|---|
| Result Dataset | Supports direct modification of source dataset or creation of new output dataset. | DatasetVector |
Notes
Sliver polygons typically refer to polygons with areas ranging from one millionth to one ten-thousandth of the largest polygon's area in the dataset. Adjust minimum area tolerance according to practical requirements.
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