Blue Marble: Next Generation is a years worth of monthly composites at a spatial resolution of 500 meters. These monthly images, from January through December, reveal seasonal changes to the land surface: the green-up and dying-back of vegetation in temperate regions such as North America and Europe, dry and wet seasons in the tropics, and advancing and retreating Northern Hemisphere snow cover.
The data are from 2004, from the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument on NASA’s Terra satellite.
For more information, visit the Blue Marble on the Earth Observatory.
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 8.0.0.0.0