NLS Map Georeferencer home page - online map georeferencing pilot programme
The Georeferencer application is a collaborative online project, where anyone can view selected early maps from our collection, and help georeference them further. From December 2014, we have upgraded Georeferencer with a number of new features. The Georeferencer application includes 1,000 early maps of Scotland, including town plans, county maps, coastal charts, and maps of Scotland, and complements our main Explore Georeferenced Maps application, for viewing map series and selected town plans.
Select a map at random you would like to view or georeference.
View maps already georeferenced:
Georeferencer is easy and fun - all you need to do is choose a map you would like to georeference, and then log into our online system (registration is an easy process, and free!). Details about the georeferencing process itself are described in the Step-by-step guide to georeferencing.
All maps georeferenced by you and other volunteers can be immediately viewed as an overlay in the application, in 2D and side-by-side viewers, as well as in the 3D Google Earth and the Google Earth browser plug-in. There are also several other good reasons why to georeference maps.
With Georeferencer you can:
- compare historic maps directly with present day satellite and map images, and dynamically change the transparency of the historic map
- georeference the maps in more detail by adding control points
- dynamically view different types of transformation on screen - affine, polynomial and spline - to see different results of the same control points
- view the maps alongside other georeferenced historical maps of the same area
- clip the borders of the map so that only the geographic or real-world map content within the map neat line is visible.
- group your favourite maps together in a My Maps section. You can also combine and compare maps from the British Library or the David Rumsey Georeferencer applications here too.
- view the geometrical accuracy and distortion of the map calculated from the control points with a distortion grid overlay. This visualization can help to identify wrongly assigned control points and can also help to understand the compilation and geometric properties of the early map better.
Read a DLib paper about Georeferencer: Georeferencer: Crowdsourced Georeferencing for Map Library Collections, Volume 18, Number 11/12, November/December 2012