New generation of Georeferencer

Mar 15

New generation of Georeferencer

Tags | georeferencer, customers, projects

Georeferencer v4 is a revolution in the online processing of scanned old maps. Matching scanned maps to the real world coordinates in a web browser has never been easier.

With feedback from the previous crowdsourcing pilots in over a dozen of countries all over the world, we have decided to reimplement our online Georeferencer tool from scratch. The new version comes with many new features, improved usability and finally, after two years of development, it is available to the public!

A complete mapping platform for old maps

The Georeferencer is now a complete mapping platform which provides the full toolset for bringing the maps from paper to screen. After the maps are scanned, they can be turned into precisely located map overlays on top of modern maps.

Redesigned interface is optimised for tablets and mobile devices. With the full-screen layout, which focuses the attention on the map, no screen space is wasted while the important tools are highlighted, and you have everything in your hand. The whole tool is collaborative so multiple people can work on the same map at the same time - similarly to Google Docs. On top of that, there are tutorials available throughout the interface so the new users can start georeferencing immediately and learn to use even the advanced features and produce professional output.

Overlay recalculated instantly

When at least three control points are placed the tool can be switched to overlay mode. The old map overlays a new map and visitors can easily add points to improve the precision of the location of the map. The map position is recalculated instantly directly in a web browser. The visitors can even switch between five different transformations and see warping results on-the-fly.

The new “My maps” sidebar allows you to add other maps as overlays to the Georeferencer tool, which can be powerful when processing a collection of seamless maps.

Various map services are available to bring the georeferenced maps to GIS tools such as ArcGIS and QGIS, web viewers such as Leaflet or OpenLayers as well as Mobile applications. The provided map services are compatible with the Web Map Tile Service (OGC WMTS). High-resolution images are displayed via International Image Interoperability Framework (IIIF).

Read more about the new features at

Online research with Compare tool

Georeferencer mapping platform also contains a new public tool that can combine maps from various institutions from OldMapsOnline. The Compare is designed for fast searching and in-depth comparison of old maps. Several view modes are available - besides overlaying the maps you can also study them in a Swipe mode, using a “Spy glass” or you can interactively compare multiple maps in a Grid.

Try the compare tool now at

David Rumsey pilot launched

David Rumsey is the first to move maps to the new version of Georeferencer. His collection of maps contains now over 47.000 images. All are available to be georeferenced at Start georeferencing now! Contact us if you are interested in starting your own Georeferencer pilot.

Author | Petr Sloup Published | 2017-03-15

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