AFI Precinct Overlay Matcher

Overlay

Load both county files

Gray/black: good geometry
Green: good names

Donor transform

Move X

Move Y

Scale X

Scale Y

Rotate

Skew X

Skew Y

Opacity

Boundary anchor warp

Use this after the green GoodNames map is globally aligned. Click Add Anchors, then click a point on the green boundary followed by the matching point on the black boundary. Repeat around the county. After you pick the green point, the green layer automatically dims and becomes click-through so you can select a black point directly underneath it. Press Esc to cancel a pending point.

Anchors: 0. Recommended: 8–16 around the county exterior.

Matching

Select a donor precinct in green, then click one or more gray target polygons.

Current matches

Export

Export uses the GoodNames geometry and interior precinct boundaries, transformed into the Good Geometry map's coordinate space. If Anchor Warp preview is enabled, the anchor-based thin-plate-spline correction is baked into the exported geometry. The Good Geometry precinct interiors are never copied.