Here in Britain people can license the Ordnance Survey's AddressBase product, which provides a list of almost all the country's addresses, along with individually surveyed building locations. Like all geodata products it's got some errors and omissions, but it's generally good - even in remote areas. This is useful for address suggestion and geocoding (some of the major parts of what I want to achieve).
I'd like to broaden my knowledge beyond just the UK. What's the best data available for the United States, and how good is it?
I'm aware that the USPS has a "zip+4" file that contains 30 million addresses (presumably not a full list of addresses in a country of 300 million people); that Navteq's map data contains street number ranges (in the UK their accuracy is OK but not the best); that Google have a geocoding API (I would prefer a database rather than an API); and that TIGER data contains some address information (I haven't fully investigated this - is it any good?). Should I be looking at one of these options in more detail, or are there other sources I've missed?
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I'd like to broaden my knowledge beyond just the UK. What's the best data available for the United States, and how good is it?
I'm aware that the USPS has a "zip+4" file that contains 30 million addresses (presumably not a full list of addresses in a country of 300 million people); that Navteq's map data contains street number ranges (in the UK their accuracy is OK but not the best); that Google have a geocoding API (I would prefer a database rather than an API); and that TIGER data contains some address information (I haven't fully investigated this - is it any good?). Should I be looking at one of these options in more detail, or are there other sources I've missed?
أكثر...