Official websites use .gov
A
.gov website belongs to an official government
organization in the United States.
Secure .gov websites use HTTPS
A
lock (
) or https:// means you’ve safely connected to
the .gov website. Share sensitive information only on official,
secure websites.
Click on image to enlarge.
VIIRS Vegetation Index (VI) is a robust empirical measure of vegetation activity at the land surface, and has been widely used to study the spatial and temporal pattern of vegetation conditions at large scale with the objective to understand the role of terrestrial vegetation in regional and global processes, such as global carbon and nitrogen cycle, global hydrological cycle and global energy cycle.
The VIIRS VI product system produces gridded VI product at global scale and North America- centric regional scale from S-NPP VIIRS granule data and J01 VIIRS granule data, which contains the Top of the Atmosphere (TOA) Normalized Difference Vegetation Index (NDVI), the Top of the Canopy (TOC) NDVI, the TOC Enhanced Vegetation Index (EVI), and relevant quality flags (i.e., Land/water mask, cloud confidence, aerosol loadings and exclusion conditions). Meanwhile, quality assurances (QA) of the VI products are generated to consider impact of various environmental factors (e.g., cloudy, sun glint, aerosol). These VI products are produced at temporal scales of daily, weekly and bi-weekly at spatial resolutions with sizes of 4 km (0.036°, global scale) and 1km (0.009°, regional scale). For detailed information visit our documentation page.
