On Monday, 11 July from 3:00 p.m. through Wednesday, 13 July until 5:00 p.m. (USA Mountain Time), NSIDC data distribution, services, and Web site will be unavailable to accommodate a major upgrade to our data center. We apologize for any inconvenience this may cause you. Need to talk to us? You can always contact our friendly User Services Office at email@example.com or + 1 303.492.6199.
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).