Coord Click: click anywhere to record lon/lat. Toggle Spray to click + hold + drag a stream of coordinates. Line Click: click start, then end. The picker assumes the nearest feature is right unless you hit Wrong / Next or Coord Only. Pair Click: build Shape 1 from multiple line segments/free coordinates, click Close Shape 1, build Shape 2, then click Close Shape 2 to complete the mapping pair. Edit: click near an existing endpoint, then click its new location. View: 2D is the old flat map. 3D is an orthographic globe with the same click modes. Right/middle-drag rotates in 3D and pans in 2D; wheel zooms; Home resets.
Loaded JSON overlays
Use the third uploader to add one or more saved JSON overlays. Click a row to highlight that file on the map. Use X to remove it.
// No JSON overlays loaded.
Coordinate clicks
Free clicks anywhere on the map.
// No coordinates yet.
Line clicks
Each record contains a start endpoint and an end endpoint. If both landed on the same GeoJSON line, a derived segment is included.
// No lines yet.
Pair clicks
Pairs preserve the old A/B rail-builder idea, but now each endpoint is chosen by nearest-feature probing instead of requiring an exact hit.