Potential allies: Working with the Commons or Wikisource communities to develop these projects is really important: long-term curation of the content is going to be dependent on their support. Finding a community of volunteers outside the Wikimedia movement that will get excited about the content makes digital crowdsourcing projects possible; with this audience in mind, it's important to design projects around exciting topical materials with clear expectations for the data improvement. }}
Case study: British Library Mapping Project
Sometimes Wikimedia projects become part of the larger effort to release and use GLAM content as free knowledge. In 2013, the British Library started releasing images of parts of its collection clearly in the public domain as part of its Mechanical Curator project. The Wikimedia community immediately began integrating the materials released on Flickr into Wikimedia projects. Of particular interest in this collection were over 50,000 public domain maps. Wikimedia Commons volunteers decided that just having the maps wasn't good enough: we need to know where the maps were located. Using a semi-automated workflow, they collaborated with the British Library to match coordinates with contemporary maps: now the maps can be used to study historical changes in the landscape.
For more information see the project page