Simplify Geometry — Reduce Vertices
Professional engine: coverage_simplify (Visvalingam-Whyatt) + adaptive Douglas-Peucker
How does it work?
- Upload a Shapefile (ZIP or individual files), GeoJSON, or KML.
- Choose the maximum number of vertices you want in the result.
- The system automatically selects the best algorithm and iteratively adjusts the tolerance.
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When to simplify?
Simplification reduces the number of vertices in complex geometries, decreasing file size without losing the overall shape. It's ideal for web visualization where sub-meter precision is not needed.
- Web maps and mobile applications
- Layers for fast visualization
- Size reduction before uploading to a CDN
Visual Example
Douglas-Peucker: reduces vertices while keeping the overall shape of the geometry.
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Frequently Asked Questions
Douglas-Peucker is the standard line-simplification algorithm in GIS. It removes vertices that fall within a tolerance distance of the line formed by the adjacent vertices, preserving the overall shape of the geometry.
It depends on the complexity of the geometries and the tolerance. With a 10 m tolerance, reductions of 50-80% are common in detailed administrative layers. With 100 m, it can reach 90-95% in very dense layers.
No. Only the number of vertices in the geometries is reduced. All attribute fields are preserved intact in the resulting layer.
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