How does the mapping process start?

First, we examine Landsat satellite images from 1984 to present, building a stack of information for the same place over many years.  Here we show an example from Yosemite National Park.

 

How do we map the changes? Tell me more

Rather than inferring change on a landscape from the differences in two satellite images at a time, we examine a time-series of as many as 25 satellite images at once which enables identifying distinct deviations from a stable spectral trajectory.

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How do we map the changes? Tell me even more

After identifying the shape of the trajectories for each pixel we are able to create a map labeling the results.

 
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