The BAG itself is something a government organisation called the 'Kadaster' maintains. I would be surprised if the US doesn't have a similar organisation.
I know some municipalities maintain extensive GIS and financial datasets that include valuation, sale data, ownership, maps, etc. Here's an example from the Boston assessor's database: http://www.cityofboston.gov/assessing/search/?pid=0503500000
But I don't know if smaller/poorer towns have created or maintain digital archives, what standards are used, or whether data is shared at the county or state level. One question I have: Is this a state or local requirement that such records are created and posted online, and how does it differ from municipality to municipality and state to state?
I would be surprised if a federal agency maintained a national database like the Netherlands, although these days it's not really clear what data our government is gathering/sharing, and for what sorts of purposes.
I know some municipalities maintain extensive GIS and financial datasets that include valuation, sale data, ownership, maps, etc. Here's an example from the Boston assessor's database: http://www.cityofboston.gov/assessing/search/?pid=0503500000
But I don't know if smaller/poorer towns have created or maintain digital archives, what standards are used, or whether data is shared at the county or state level. One question I have: Is this a state or local requirement that such records are created and posted online, and how does it differ from municipality to municipality and state to state?
I would be surprised if a federal agency maintained a national database like the Netherlands, although these days it's not really clear what data our government is gathering/sharing, and for what sorts of purposes.