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Looking for facts and information? See About the Cryosphere.
Icelights: Answers to your burning questions about ice and climate
What's hot in the news around climate and sea ice and what are scientists talking about now? Read more...
What is the Cryosphere?
When scientists talk about the cryosphere, they mean the places on Earth where water is in its solid form, frozen into ice or snow. Read more ...
If a pixel in MODIS bands 2 and 4 has an NDSI value greater than or equal to 0.4 and the reflectance in bands 2 and 4 is greater than 0.10 (as shown by the cross-hatched rectangle), it is mapped as snow.
A separate group of criteria tests is used to better detect snow in vegetated regions. If the value of NDSI and NDVI of a pixel falls in the region indicated by the left polygon, it is mapped as snow.