Topic Media - Archived

How does the Earth's Vegetation Change over a year?

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A movie showing changes in the Earth's vegetation


The above movie shows an index of vegetation across the entire globe, derived by spacecraft measurements. This index (called the Normalized Difference Vegetation Index, or NDVI) is a measure of how green the surface is. If the surface is more green, more vegetation exists there. This movie shows how the vegetation changes with the seasons over an entire year. The movie begins in January, when it is greener in the southern hemisphere (it is summer there then). By half-way through the movie (June), it is summer in the northern hemisphere and greener there. Notice how some regions near the equator stay green all year around.



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