NASA's Terra MODIS sensor can be used to observe changes
around the world since 2000.
The data are frequently used to study drought and water availability.
Here are the Terra MODIS observations of the snowpack on the Sierra Nevada
mountain range from 2000 to 2017. The melt from this snowpack provides
California with 30 percent of their drinking water during years with
average rainfall. The California Department of Water Resources measures
the amount of snowpack in the mountains every year on April 1, to provide
consistent data and to study the size of the snowpack. Notice how in the
drought years the snowpack is smaller in size than it is during the wetter years.
Lower amounts of snowpack can be problematic during times of drought,
as it limits the water resources for California residents.
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