← Topology Tools

Boundary Cross-walk

Compare two versions of a polygon layer (e.g. ADM2 across census rounds) and classify each unit as unchanged, modified, merged, split, created, or removed. Drop both versions; the tool overlays them, scores coverage per pair, and groups related polygons into clusters.

Step 1 — Drop both layers

Previous

Drop a file here

or browse

Older version. Polygon layer in any supported format.

New

Drop a file here

or browse

Newer version. Same coverage area.

Step 3 — Thresholds

τ_match = 0.50

Minimum coverage (in either direction) for a pair to count as related. Lower = more matches.

τ_same = 0.98

IoU above which a 1:1 cluster is treated as unchanged rather than modified.

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Class	Previous code	Previous name	New code	New name	Cov A	Cov B	IoU

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