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.
A B/S (Browser/Server) structure was used. General users access the interface by PC, PDA or mobile phone in the field, the server service provides data and map services to the users, and the control interface is accessed by the super administrator to add or delete data.
