Ordnance Survey map data will be freely available online to everybody from 2010, the Government has announced.
The move will allow people to interpret public statistics about crime, health and education by postcode, local authority or electoral boundary.
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Opening it up is key to the success of government plans to free its data via data.gov.uk, say the site's creators.
"Making all that data available doesn't make much sense without the geography to tie it all together," Professor Nigel Shadbolt, one of two Information Advisers to the government, told BBC News.
The other adviser is Sir Tim Berners-Lee, inventor of the web. He and Prof Shadbolt have been tasked with guiding the Making Public Data Public project.