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Warping a map image with the Map Warper ( is an open-source map-warping / geo-rectifying service, written in Ruby on Rails and lets users import maps or aerial photos and warp/rectify them to fit into openstreetmap. Geothings is MIT licenced. The project was created by Tim Waters.

This tool is used to create WMS and Tile Layers which can be used in JOSM or Potlatch for tracing maps (that you have the permission to use).

old version

Note that there is an older version of this project at but which has limits on image size or dimensions.

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