NPP/VIIRS Surface Reflectance Daily L2G Global 1km and 500m SIN Grid NRTEntry ID: VNP09GA_NRT_1
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
For more information read Suomi-NPP VIIRS Surface Reflectance User's Guide at https://viirsland.gsfc.nasa.gov/PDF/VIIRS_Surf_Refl_UserGuide_v1.1....
visit VIIRS Land website at https://viirsland.gsfc.nasa.gov/index.html
Data Set Citation
Dataset Originator/Creator: LANCEMODIS
Dataset Title: NPP/VIIRS Surface Reflectance Daily L2G Global 1km and 500m SIN Grid NRT
Dataset Release Date: 2016-11-01T00:00:00.000Z
Dataset Release Place: NASA GSFC LANCE
Dataset Publisher: LANCEMODIS
Dataset DOI: http://dx.doi.org/10.5067/VIIRS/VNP09GA_NRT.001Online Resource: https://earthdata.nasa.gov/earth-observation-data/near-real-time/do...
Quality This is a near real-time (NRT) product that has undergone expedited processing to make it available within 3 hours of observation time to meet the needs of the NRT applications community. NRT data are subject to geolocation errors or reprocessing. Usually the geolocationalerrors are minimal (less than 100 meters), however, there are situations, particularly before and after spacecraft maneuvers and during space weather events, when the difference can increase up to several kilometers.
Access Constraints No constraints but users need to be registered with the ESDIS User Registration system (https://urs.eosdis.nasa.gov/users/new) to download files via the FTP site.
Use Constraints None. See disclaimer: https://earthdata.nasa.gov/data/near-real-time-data/about-lance/dis...
Distribution Media: https, ftp
Distribution Format: h5 (Hierarchical Data Format (version 5))
Fees: No Fee
Extended Metadata Properties
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