Map tiles
Line transplant
Take the roads and other line layers of one map tile and paste them onto another. Both files stay in this browser tab.
Base tile
The terrain, meshes and starting lines of this tile are kept.
Line source
Only the line layers of this tile are copied onto the base tile.
Load both tiles, then convert. The preview shows the lines that will be written.
Output
Toolbox adapted from Stormworks-Tools-Online by lganic, MIT licensed. Thanks to kadebrown for the tile icon that inspired the original tool.