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OSPO has been producing Green Vegetation Fraction (GVF) as a NOAA-Unique Product (NUP)
from the Visible Infrared Imager Radiometer Suite (VIIRS) sensor onboard the Joint Polar
Satellite System (JPSS), for applications in numerical weather and seasonal climate prediction
models at the National Centers for Environmental Prediction (NCEP). The retrieval algorithm
uses VIIRS red (I1), near-infrared (I2) and blue (M3) bands centered at 0.640 μm, 0.865 μm and
0.490 μm, respectively, to calculate the Enhanced Vegetation Index (EVI) and derive GVF from
EVI. GVF is produced as a daily rolling weekly composite at 4-km resolution (global scale) and 1-
km resolution (regional scale).
GVF data products are needed for land surface initialization in numerical weather prediction
models and land surface monitoring. The previous GVF operational product was based on Top
of the Atmosphere (TOA) Normalized Vegetation Index (NDVI) derived from the AVHRR sensor.
With the launch of the Earth-observing JPSS series, Suomi NPP (S-NPP), J01(NOAA-20), and
J02(NOAA-21), NESDIS has sustained the production of a new real-time weekly VIIRS GVF
products. The VIIRS GVF is based on the Top of Canopy (TOC) Enhanced Vegetation Index (EVI).
