VNP13A1: VIIRS Vegetation Indices 16-Day 500m (NOAA/VIIRS/001/VNP13A1)

Version V001

The Suomi National Polar-Orbiting Partnership (S-NPP) NASA Visible
Infrared Imaging Radiometer Suite (VIIRS) Vegetation Indices (VNP13A1)
data product provides vegetation indices by a process of
selecting the best available pixel over a 16-day acquisition period
at 500 meter resolution. The VNP13 data products are designed
after the Moderate Resolution Imaging Spectroradiometer (MODIS)
Terra and Aqua Vegetation Indices product suite to promote the
continuity of the Earth Observation System (EOS) mission.

The VNP13 algorithm process produces three vegetation indices: (1)
Normalized Difference Vegetation Index (NDVI), (2) the Enhanced
Vegetation Index (EVI), and (3) Enhanced Vegetation Index-2 (EVI2).
(1) NDVI is one of the longest continual remotely sensed time series
observations, using both the red and near-infrared (NIR) bands.
(2) EVI is a slightly different vegetation index that is more sensitive
to canopy cover, while NDVI is more sensitive to chlorophyll. (3) EVI2
is a reformation of the standard 3-band EVI, using the red band and
NIR band. This reformation addresses arising issues when comparing
VIIRS EVI to other EVI models that do not include a blue band. EVI2
will eventually become the standard EVI.

Along with the three Vegetation Indices layers, this product also
includes layers for near-infrared (NIR) reflectance; three shortwave
infrared (SWIR) reflectance—red, blue, and green reflectance; composite
day of year; pixel reliability; view and sun angles, and a quality layer.

For additional information, visit the VIIRS Land Product Quality
Assessment website
and see
the User Guide.

NameDescriptionGee Scale
EVI3 band Enhanced Vegetation Index0.0001
EVI22 band Enhanced Vegetation Index0.0001
NDVINormalized Difference Vegetation Index0.0001
NIR_reflectanceNear-infrared Radiation reflectance
SWIR1_reflectanceShortwave Infrared Radiation reflectance
SWIR2_reflectanceShortwave Infrared Radiation reflectance
SWIR3_reflectanceShortwave Infrared Radiation reflectance
VI_QualityQuality Assessment (QA) bit-field.
red_reflectanceRed band reflectance
green_reflectanceGreen band reflectance
blue_reflectanceBlue band reflectance
composite_day_of_the_yearJulian day of year
pixel_reliabilityPixel usefulness using a simple rank class
relative_azimuth_angleRelative azimuth angle for each pixel
sun_zenith_angleSun zenith angle for each pixel
view_zenith_angleView zenith angle for each pixel


NASA LP DAAC at the USGS EROS Center (producer, licensor)
Google Earth Engine (host)
STAC Version 0.6.0
Keywords 16-day, evi, nasa, ndvi, noaa, npp, vegetation, viirs, vnp13a1
License proprietary
Temporal Extent 1/16/2012, 4:00:00 PM - now
Citation Please visit [LP DAAC 'Citing Our Data' page]( for information on citing LP DAAC datasets.
Type image_collection
GSD metersm
Platform Suomi NPP
Instrument VIIRS
Cadence days