This series of maps shows how much the landscape of the eastern United States changed between 1650 and 1992. The maps depict canopy height, the height of the tallest continuous layer of vegetation.
Open-access data from the NASA-USGS Landsat mission and cloud computing make for a highly detailed view of gains and losses in global and regional tree cover since 2000.
Scientists at the U.S. Forest Service and the Bureau of Land Management are using satellites -- Landsat 5 and Landsat 7 -- to determine where spotted owls are likely to nest.