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.
Left: Mean annual air temperature in 2006 derived from the ground weather network AMeDAS. Right: Leaf onset date in 2006, as derived using the green–red vegetation index (GRVI) method (Motohka et al. 2010) based on Terra/MODIS data at 500-m resolution. The areas without color are places where leaf onset was not detected.
