The British Library needs your help.
It is in the process of turning its gargantuan collection of maps into a digital resource tied to Google Earth. This allows people to see ancient and modern maps at the same time, with a slider to fade between the centuries. It’s easy to compare a city to its younger self, or observe the geographic impact of dams, bulkheads, and embankments. You can spot the mistakes — or marvel at the accuracy — of mapmakers working in the pre-electric age.
But for this to happen, the Library needs people to set up control points linking old maps to satellite data. It’s simple: you find recognizable locations and join them. Then, the software uses your input to mesh the two maps. (You can learn about georeferencing and be assigned a random map here.)
Read more. [Images: The British Library]
I did a map of the Netherlands.