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Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( focusable="false" ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Coordinate accuracy codes

Appropriate code on the schedule to indicate the accuracy of the latitude-longitude values.

metadata features

Other links

Reference Systems