[Talk-us] Help needed with polygon/membership of admin area in Willits, CA

stevea steveaOSM at softworkers.com
Sun Jan 26 20:12:00 UTC 2014


Common "outlying areas" of "corporate municipality" (city) boundaries 
in the USA include landfills, recycling/material storage/transfer 
centers, corporation yards (equipment storage and/or service areas, 
sometimes fabrication, e.g. signage), water and sewage treatment 
plants, and in some cases even (city) parks and recreation areas, 
such as a city-owned public golf course.  It is legal, and actually 
somewhat common, for boundaries of a single political entity to be 
discontiguous, whether of a city or even a country.

OSM's multipolygon relation is an excellent data structure to capture 
the semantics of the multiple-polygon nature of such single entities 
as a city with multiple exclaves like this.  However, it is crucial 
to apply correct syntax of proper tags on the multipolygon relation, 
as well as roles on the member polygons.

SteveA
California



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