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.
Thematic map with the top left quadrant representing the niche or specialised theme (Q1), the top right quadrant being the motor or driving theme (Q2), bottom left quadrant containing emerging or declining themes (Q3), and the bottom right quadrant consists of main or basic themes (Q4).
