GeoJSON Lineage

Load an Older and Newer GeoJSON (URL or upload). Then generate Newer‑base lineage output.

Stored locally in your browser (localStorage). Do not paste secret (sk…) tokens.
Older GeoJSON (e.g., 2019)
Tip: GitHub “blob” links are accepted; we auto-convert to raw.
Newer GeoJSON (e.g., 2024)
Tip: GitHub “blob” links are accepted; we auto-convert to raw.
Older GeoJSON (outline)
Newer GeoJSON (outline)
Newer‑base Lineage (fill by category)
Legend
  • Merged: multiple Older centroids inside one Newer polygon
  • Split: one Older polygon contains multiple Newer centroids
  • Changed: one-to-one but GEOID/geometry differs (best-effort)
  • Associated: one-to-one and unchanged (best-effort)