== GeoReferencing ==

Integrate a Rectifier to be able to overlay Images (such as Old Printed Maps) on the base maps:

 * http://warper.geothings.net/
 * http://mike.teczno.com/notes/canvas-warp.html
  * Code: http://github.com/migurski/canvas-warp
 * http://labs.metacarta.com/rectifier/

Design discussion for !GeoExplorer:
 * http://projects.opengeo.org/geoext/wiki/Georeferencing

qGIS has this functionality in a Desktop tool

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[wiki:BluePrintGeographicInformationSystems GIS BluePrints]