Historic Cupertino boundaries

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The City of Cupertino maintains a GIS layer of annexation areas. This dataset is in the public domain as a work of a California government agency. We can create boundary relations based on these areas for OpenHistoricalMap.

Each area comes with two dates: the date on which the annexation ordinance was filed by the city, and the date on which it was certified by the county. In some cases, the dates are quite far apart. For example, McClellan 1-A was finalized by the city on April 2, 1959, but only certified by the county on December 31, 1969. We’ll need to figure out which date matters more, or even map a disputed boundary if that’s the reason for the discrepancy.

Cupertino borders both San José, whose boundaries were imported in #28, and Mountain View, whose boundaries are tracked in #33. We’ll need to conflate the boundaries to one if not both of these cities, depending on the order in which we carry out these imports.