Feature To Polygon (Single File)
Overview
Feature To Polygon (Single File) has the same purpose as Feature To Polygon, but it extracts polygons from line or polygon features in a single vector file. The tool calculates all intersections in the input feature dataset, splits edges at the intersections, and reconstructs polygon features from the smallest closed rings formed after splitting.
Use Cases
- Parcel splitting and reconstruction: Overlay planning boundaries with existing parcel lines to automatically generate subdivided parcel polygons.
- Block generation: Identify and fill block polygons enclosed by a road centerline grid.
- CAD data conversion: Convert closed or partially closed frames imported from AutoCAD into GIS polygon features.
- Data repair: Split and rebuild polygons with gaps or small overlaps to remove topology errors.
Parameters
| Parameter | Description | Notes |
|---|---|---|
| Input features 1 | First feature group used in the operation. | Supports line and polygon features. |
| Input features 2 | Second feature group used in the operation. | Supports line and polygon features. |
| Output path | Folder where the result is stored. | Select the target folder. |
| Output file name | Name of the output feature dataset. | Text without the file extension. |
Steps
- Open the tool: Open the Geoprocessing Toolbox, go to Vector Tools > Feature Conversion, and open Feature To Polygon (Single File).
- Set the input: Load the features to be spatially split into the input fields.
- Configure parameters: Configure reprojection or field filtering options in advanced settings if needed.
- Set the output: Specify the output path and file name.
- Run the tool: Click Run. iXGIS automatically searches for all closed rings and generates polygon features.
Notes
- Closure requirement: Only line or polygon combinations that form completely enclosed areas generate polygon features. If small physical gaps exist, run Align Shared Vertices first.
- Attribute loss: Because polygon construction involves geometry reconstruction, the output polygon features may not fully retain all attributes from the original layers. Use Spatial join after polygon construction to recover attributes when needed.
- Topology quality: Complex self-intersecting line features may cause abnormal polygon output. Run Repair Geometry first. A projected coordinate system is recommended for processing.