The surface reflectance data are created by applying corrections for atmospheric gases and aerosols to the top of atmosphere reflectance data. Surface reflectance data are available from January 19, 2012 to present. Through LP DAAC, several surface reflectance products are available:
Land data: To allow consistency with MODIS, NASA resamples surface reflectance and other land products (vegetation indices, LAI/FPAR, thermal anomalies and fire) to 500 m, 1 km, and 0.05 degrees. These data are available as daily images, or 8-day to monthly composite images, and distributed as 1200 km x 1200 km tiles in a sinusoidal projection system. For more information, click here. Information for each NASA VIIRS land product can be found in the
The Visible Infrared Imaging Radiometer Suite (VIIRS) is an instrument onboard the Suomi National Polar-Orbiting Partnership (S-NPP) spacecraft, which was launched October 28, 2011. The VIIRS instrument follows the legacy of, and improves upon, the measurements made by the NOAA AVHRR and the MODIS instruments on Aqua and Terra. VIIRS observes Earth’s entire surface twice each day, with an equator crossing time of approximately 1:30 a.m. and 1:30 p.m.