Topology Cleaner
Detect overlaps and gaps in a polygon coverage and clean them automatically, with an adjustable gap-width threshold.
Topology Tools
Browser-only geospatial topology utilities. All processing runs client-side via WebAssembly — your files never leave your device.
Tools
Edge Extender
Fill gaps between adjacent polygons by extending boundaries outward with Voronoi diagrams.
Edge Matcher
Match fine polygons to their best-overlapping coarse boundary — admin 4 into 3, admin 4 into 0, or any other pair — then extend each group to fit its boundary exactly.
Changelog
Compare two versions of a polygon layer and classify each unit as unchanged, modified, merged, split, created, or removed.