I'm using a shapefile of TIGER data provided by the Census Bureau for locating an individual's congressional district. In PostGIS I'm running an
ST_Intersects query in order to take a (lat, long) coordinate and return the results set.
Of course, there are many points along the polygons that intersect both, but are not contained in either, hence the choice for
Are there any real world examples of addresses that actually straddle two congressional districts? This edge case makes me suddenly nervous that I could be presenting users with the wrong district.
It appears that congressional districts might use census blocks which divide streets down the middle, so you technically should not have an address that bounds both. A follow-on question would be whether there are any known conflicts between a service's address geocoding and census mapping.