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A web application (currently named “MapWarper”) is presented enabling a user to upload an image and rectify it. The website is built using RubyOnRails, and uses OpenLayers, GDAL, Tilecache and Mapserver. Initially designed to help people digitize old maps for the OpenStreetMap project, it’s scope has been widened.
Users can sign up and upload images, such as scanned paper maps, amateur areal photos. Images can be cropped and aligned with existing rectified images. Maps can be rectified collaboratively, by other users, crowd sourcing. The rectified images can then be used, with the ability to download as “google-maps style” tiles or through WMS service. Metadata regarding provenance and licensing is captured. All maps are searchable, resulting in a library of user submitted maps.
Full code for the application is released under an open source licence.
An initial beta of the service can be found here: http://wrp.geothings.net
Tim is a freelance geospatial consultant. He is based in Leeds, West Yorkshire, United Kingdom. Tim holds a MSc in GIS and a BSc in Environmental Science.