Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Data Model posters for The National Map. These posters will be available through the Specifications Explorer web application (Spec-X) in the near future. Please note this is a temporary page until the Spec-X poster page is available.