[Talk-us] Facts about the world
darrell at garnix.org
Sat Apr 4 21:21:42 UTC 2015
TIGER is much older than reasonably portable GPS units. It was originally developed for the 1990 Census, which means work began much earlier than that. In 1990, handheld GPS units were not even available to the military.
Much of the original data was traced from paper maps (which is also true of a great deal of GIS data in use today).
They have an ongoing project to update the data in cooperation with local governments, but those entities are often resource constrained themselves. It would be great if we could share OSM data with them all, but of course we can't.
> On Apr 4, 2015, at 13:30, Mike N <niceman at att.net> wrote:
>> On 4/4/2015 1:04 PM, Minh Nguyen wrote:
>> I wonder if it was even about the resolution in some counties. It's as
>> if the data was traced off a cartogram, or maybe reconstructed from a
>> table of intersections.
> Or recorded with a GPS back in the days when the signal was scrambled, that is with the deliberate random error measured by non-military grade GPS receivers.
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