#TIME ZONE MAP USA INTERACTIVE HOW TO#

Also, recently the OpenStreetMap wiki page Key:timezone was updated to include great instructions on how to map timezone boundaries. Since then, the timezone relations in OpenStreetMap have remained and improved in quality.

Shortly after this project began in the year 2017, there was controversy on the OpenStreetMap mailing list about whether timezone relations should exist in OpenStreetMap. Some of these relations are pulled in verbatim by this project. A lot of the timezone boundaries exist by piggy-backing on top of existing administrative boundary relations, however some timezone boundaries have their own dedicated relations. Within OpenStreetMap there exist a lot of data about timezone boundaries. If there are no new timezones created or deleted in a timezone database release, then this project will only create a release if there have been changes performed to the boundary definitions of an existing zone within this project. To maintain consistency with the timezone database, this project will only create a new release after the timezone database creates a new release. In numerous edge cases arbitrary boundaries get created in various zones which are noted in the timezones.json file. Various boundaries are assembled together to produce each zone with various geographic operations. The underlying data is downloaded from OpenStreetMap via the overpass turbo API. This project also will attempt to provide the most accurate possible boundaries of timezones according to community input. This project aims to stay up-to-date with all of the currently valid timezones that are defined in the timezone database. The tzid corresponds to the timezone name as defined in the timezone database (for example: America/Los_Angeles or Asia/Shanghai).

Each shape or geojson object has a single attribute or property respectively called tzid. As of release 2018d shapefiles are available with or without oceans. The shapefiles are available for download in this project's releases. The goal of this project is to produce a shapefile with the boundaries of the world's timezones using OpenStreetMap data.

Time zone map usa interactive