Help! British Library needs 50,000+ maps georeferenced
We have 50,000 maps online that we ask you - the public - to identify the geographical location of. The BL Georeferencer release is now live at
“A plan of the city of Stockholm” published in 1802, overlaid on current Google mapping
Using the BL Georeferencer online application, you will be presented with a historic map from a 19th century book; by finding the location on a modern map or imagery alongside, the old map is “georeferenced”, and can be overlaid and interacted with in your browser (as above).
This is our largest release of maps yet, and will be a formidable task to complete, so any amount of help you can offer us will be gratefully received!