Simplify Features
Overview
The Simplify Features tool simplifies feature geometry by removing redundant vertices. It reduces data volume and significantly improves processing, rendering, and analysis efficiency while preserving the main shape characteristics of features as much as possible.
This tool primarily uses the Douglas-Peucker algorithm. It thins geometry using Simplification tolerance as the main constraint. The tolerance value represents the maximum allowed offset distance between the simplified line segment and the original vertices.
Use Cases
- Multi-scale map production: Simplify complex administrative boundaries in small-scale views to improve map appearance.
- Large-data rendering optimization: Reduce the vertex count of large polygon features to lower frontend memory usage.
- Faster spatial computation: Simplify complex line features before time-consuming buffer or overlay analysis.
Parameters
| Parameter | Description | Notes |
|---|---|---|
| Input features | The feature dataset to simplify. | Repair geometry before processing is recommended. |
| Simplification tolerance | The maximum allowed offset distance. | Default: 0.001. |
| Topology tolerance | The minimum topology recognition distance. | Used to maintain topological consistency between geometries. |
| Output feature dataset | The simplified output result. | Supports common vector formats. |
Steps
- Start the tool: Open the Geoprocessing Toolbox, go to Vector Tools > Feature Processing > Trim, and open the Simplify Features tool pane.
- Set the input: Select Input features.
- Configure parameters: Set an appropriate Simplification tolerance.
- Configure the output: Set the output path and file name.
- Run the tool: Click Run and review the result.
Notes
- The unit of Simplification tolerance follows the coordinate system of the input data. Projected coordinate systems usually use meters, while geographic coordinate systems use degrees.
- An excessively large tolerance can severely distort geometry or even cause topological self-intersections. Start testing with a very small value.
- After large-scale simplification, run Check Geometry to validate the output result.