On Friday, 30 January 2015 from 8:00 a.m. to 5:00 p.m. (USA Mountain Time), we will be performing scheduled maintenance, which may cause temporary disruptions to our Web site, applications, and FTP. We apologize for any inconvenience this may cause you.
Figure 2. Graph showing classification of pixels for summer forest, snow-covered forest field, and winter forest, from Normalized Difference Snow Index (NDSI) and Normalized Difference Vegetation Index (NDVI). From Klein, Hall, and Riggs (1998).