Landsat: 25 Years of Land-Use Change near Portland, Oregon
Released on April 2, 2013
This animation shows land-use changes over 25 years around the area of Portland, Oregon, United States, and Mt. St. Helens in Washington state.
In this visualization, north is to the right and west is up. The city of Portland, Oregon can just be seen on the left edge of the image, while Mt. St. Helens shows up as a large red/purple area in the middle right.
Areas of vegetation are shown in blues, greens and yellows while areas lacking vegetation are shown in reds, oranges, and browns. As the animation cycles through the years 1984-2008, the harvest and regrowth cycle of commercial forestry operations can be seen, along with gradual re-vegetation of areas destroyed by the 1980 volcanic eruption of Mt. St. Helens.
GCMD keywords can be found on the Internet with the following citation:
Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 184.108.40.206.0