Making maps from trajectories

 

Once segments have been identified, they can be summarized in maps in different ways.  One approach labels the change that has occurred in each pixel according to characteristic sequences of change over time. 

 

Above, we show maps of LandTrendr Change Labels for areas near Yosemite and Sequoia and Kings Canyon National Parks in the Sierras of California. Greens indicate where vegetation has been increasing steadily for years, while brown indicates where vegetation has been declining steadily.  Pinks and purples identify areas of disturbance, in some cases caused by fires and others by harvest, with different colors corresponding to different sequences of change before and after the major disturbance.