S-NPP Product Descriptions: VNP09GA
Last update: November 1, 2016
Data Set Short Name:
Data Set Long Name:
NPP/VIIRS Surface Reflectance Daily L2G Global 1km and 500m SIN Grid NRT
Suomi National Polar-orbiting Partnership (S-NPP)
Visible Infrared Imaging Radiometer Suite (VIIRS)
The VNP09GA_NRT is a Near Real Time (NRT) S-NPP/VIIRS 500m and 1km Daily Level 2G Surface Reflectance product. The NPP/ VIIRS surface reflectance products are estimates of surface reflectance in each of the VIIRS reflective bands I1-I3, M1-M5, M7, M8, M10, and M11. VNP09GA is a Level-2G surface reflectance product produced on a 10km x 10km grid. The VNP09GA surface reflectance product is composed of all available surface reflectance observations for a given day over a set of tiles with global coverage. The tile numbering scheme and boundaries are the same as for MODIS. The first set of observations for each data set and grid cell are projected onto a two-dimensional grid and stored as 10km square tiles at 500m and 1 km resolution.
Surface reflectance is obtained by adjusting top-of-atmosphere reflectance to compensate for atmospheric effects. Corrections are made for the effects of molecular gases, including ozone and water vapor, and for the effects of atmospheric aerosols. The inputs to the surface reflectance algorithm include top-of-atmosphere reflectance for the VIIRS visible bands (VNP02MOD, VNP02IMG), the VIIRS cloud mask and aerosol product (NPP-CMIP_L2), aerosol optical thickness (NPP_VAOTIP_L2, NPP_VAMIP_L2), and atmospheric data obtained from a reanalysis (surface pressure, atmospheric precipitable water, and ozone concentration).
All surface reflectance products are produced for daytime conditions only. The product is produced under all atmospheric conditions except for night and oceans. Pixels when not produced are replaced by fill values in the Level-2 and Level-2G products.
file_naming_convention = "VNP09GA_NRT.AYYYYDDD.HHMM.VVV.YYYYDDDHHMMSS.h5
- AYYYYDDD = Acquisition Year and Day of Year
- HHMM = Hour and minute of acquisition
- VVV = Version number
- YYYYDDDHHMMSS = Production Date and Time
- h5 = Hierarchical Data Format (version 5)
For more information read Suomi-NPP VIIRS Surface Reflectance User's Guide
or visit VIIRS Land website
~460 file per day
500m & 1km
File Size (MB):
NASA Suomi-NPP Land Science Team/MODIS Adaptive Processing System (MODAPS)