Ordnance Survey's Liz Ratcliffe presents at the Guardian's Activate Summit.

Presentation: Liz Ratcliffe, Ordnance Survey

Guardian Activate is a summit aimed at world-changing individuals and communities who have proven that through the use of technology and the internet we can make the world a better place. If you missed a talk or just want to recap memorable presentations from the day, you can download our videos for free on iTunes music store. We'll be releasing a new Activate video every week so stay tuned. With iTunes, you can subscribe to the series and have new talks automatically downloaded.

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Presentation: Liz Ratcliffe, Ordnance Survey

Presentation: Liz Ratcliffe, Ordnance Survey