[Talk-us] Strange city boundary: Lee, Illinois

Martijn van Exel m at rtijn.org
Wed Nov 14 16:04:33 UTC 2018


I guess https://wiki.openstreetmap.org/wiki/United_States_admin_level <https://wiki.openstreetmap.org/wiki/United_States_admin_level> is really not correct then where it says: "Census Designated Places (CDPs) are boundaries maintained by the Census Bureau for statistical purposes. CDPs should be tagged boundary=census, ideally without an admin_level=* tag.”

Almost all Utah admin8 are in fact TIGER CDP boundaries: http://overpass-turbo.eu/s/DFS <http://overpass-turbo.eu/s/DFS> 

Also, https://wiki.openstreetmap.org/wiki/Tag:boundary=administrative#10_admin_level_values_for_specific_countries <https://wiki.openstreetmap.org/wiki/Tag:boundary=administrative#10_admin_level_values_for_specific_countries> is incorrect where it states that admin8 are "state municipalities: cities, towns, villages and hamlets (infrequent)”

Furthermore, https://wiki.openstreetmap.org/wiki/WikiProject_United_States/Boundaries <https://wiki.openstreetmap.org/wiki/WikiProject_United_States/Boundaries> is also incorrect and suggests "Census-designated places (CDPs) are statistical, not administrative areas. Project TIGER fixup deletes outdated CDPs and retags relevant ones from boundary=administrative admin_level=8(or 7) to boundary=census, no admin_level=*.”

Finally, there seem to be too many wiki pages covering this :) But that’s not unique for this topic.

I guess we have some work to do! 


> On Nov 14, 2018, at 8:54 AM, Ian Dees <ian.dees at gmail.com> wrote:
> A friendly reminder that Census's TIGER data we have previously imported as admin8 polygons aren't actually official city boundaries. They're "Census Designated Places <https://en.wikipedia.org/wiki/Census-designated_place>" which are just named "concentrations of people". In some cases the Census may have gone to the trouble of incorporating city boundary information, but my guess is that the majority of cases are just "Census blocks that look like they're part of the city".
> Having said that, there really isn't a good national-level dataset of city boundaries and Google uses CDP boundaries for their search results...
> On Wed, Nov 14, 2018 at 9:49 AM Martijn van Exel <m at rtijn.org <mailto:m at rtijn.org>> wrote:
> Sorry that link is bad. https://cloud.rtijn.org/s/ZLen9D8M3tYaAgj <https://cloud.rtijn.org/s/ZLen9D8M3tYaAgj> 
>> On Nov 14, 2018, at 8:44 AM, Martijn van Exel <m at rtijn.org <mailto:m at rtijn.org>> wrote:
>> I looked at a few place boundaries in Utah and compared with current TIGER files.. Definitely needs work.. https://www.dropbox.com/s/e1113me8y9t1my5/Screenshot%202018-11-14%2008.42.30.png?dl=0 <https://www.dropbox.com/s/e1113me8y9t1my5/Screenshot%202018-11-14%2008.42.30.png?dl=0> (colored = current OSM, grey = TIGER places shape file 2018)
>> Martijn
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