For the exact details of the assignments, see the script in the ingredients. The next step is to perform an overlay of the two maps, to progressively assign a tzid to the geometries (identified by a combination of state, county and “modern” timezone, in accordance with the description above), and to finally dissolve on the tzid attribute. Layer, the change was to replace the common boundaries by the dataįrom the County Boundaries. Zone boundary departs from a county boundary. Layer, the only change was to add intermediate points where a time Unfortunately, these two maps do not work well together: forĮxample, some common boundaries are not digitized in exactly the same Maps only captures the current time zones and does not include the
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