This animation shows 4 years of picture post images (2005 to 2009) from Menotomy Rocks Park, Arlington, MA. It also displays a greeness index calculated from the images, NDVI (Normalized Difference Vegetation Index, a measure of the ‘greenness’ of an area) measured by the MODIS (Moderate-Resolution Imaging Spectroradiometer) satellite, and MODIS albedo for the same period. Data from: Oak Ridge National Laboratory Distributed Active Archive Center(http://daac.ornl.gov/MODIS/modis.html)