BY CAITLIN DEMPSEY MORAIS
The Landsat Ecosystem Disturbance Adaptive Processing System (LEDAPS) takes advantage of the30 year Landsat archive to inventory recent disturbances and forest-cover change. Using mid-summer, cloud free Landsat data from the Global Land Survey (GLS) project, LEDAPS first corrects the images to remove atmospheric effects from surface reflectance (source code for LEDAPS) before applying change detection techniques to map out disturbance, regrowth, and permanent forest conversion across the continental United States.
One of the resulting products is a map of the continental United States and Canada showing forest disturbance rates from 1990-2000. Areas on the map that are green indicate the least amount of disturbance during that time period which pink to red areas indicated the highest amount of disturbance.
Data produced from NASA’s project is contribute to the North American Carbon Program (NACP), a component of the USGCRP Carbon Cycle Science Program. The NACP is a coalition of researchers seeking to better understand the carbon cycle such as carbon sources and sinks and changes in carbon stocks.
Disturbance data can be downloaded from North American Forest Dynamics (NAFD) product archive at ORNL DAAC.
LANDSAT-DERIVED FOREST DISTURBANCE RATE (STAND REPLACING), 1990-2000, AGGREGATED TO 500M GRID. SOURCE: NASA.
Reference
Goward, S.N., C. Huang, J.G. Masek, W.B. Cohen, G.G. Moisen and K. Schleeweis. 2012. NACP North American Forest Dynamics Project: Forest Disturbance and Regrowth Data. Available on-line [http://daac.ornl.gov] from ORNL DAAC, Oak Ridge, Tennessee, U.S.A.http://dx.doi.org/10.3334/ORNLDAAC/1077
Source: GIS Lounge - Maps and GIS
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