The ORNL DAAC is pleased to announce the release of a data set associated with The North American Carbon Program (NACP):
NACP: MODIS Daily Land Incident 4-km PAR Images for North America, 2003-2005 . Data set prepared by S. Liang and D. Wang. This data set contains daily Moderate Resolution Imaging Spectroradiometer (MODIS) land incident photosynthetically active radiation (PAR) Images over North America for the years 2003 - 2005. The daily images were derived by integrating MODIS/Terra and MODIS/Aqua instantaneous PAR data where the instantaneous PAR data is estimated directly from Terra or Aqua MODIS 5-min L1b swath data (Liang et al., 2006 and Wang et al., 2010).The spatial distribution of this data set includes the MODIS tile subsets covering North America, Central America, portions of South America, and Greenland, and the spatial resolution is 4 km x 4 km. The files are distributed in the HDF-4 file format.
The North American Carbon Program (NACP) is a multi-disciplinary research program designed to obtain scientific understanding of North America's carbon sources and sinks and of the changes in carbon stocks needed to meet societal concerns, and to provide tools for decision makers. NACP began in 2002 and continues to date. The NACP data collection contains continental carbon budgets, dynamics, processes, and management of the sources and sinks of carbon dioxide, methane, and carbon monoxide in North America and in adjacent ocean regions.
The ORNL DAAC is a NASA-funded data center archiving and distributing terrestrial ecology and biogeochemical dynamics data.