VNP13A1.002: VIIRS Vegetation Indices 16-Day 500m

Dataset Availability: 2012-01-17T00:00:00Z–2024-11-24T00:00:00Z
Dataset Provider: NASA LP DAAC at the USGS EROS Center
Earth Engine Snippet: ee.ImageCollection("NASA/VIIRS/002/VNP13A1")

Cadence: 8 Days
Tags: 16-day evi nasa ndvi noaa npp vegetation viirs
vnp13a1

Description

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.

Documentation:

General Documentation

Bands

Resolution
500 meters

Bands

Name	Units	Wavelength	Description
`EVI`			3 band Enhanced Vegetation Index
`EVI2`			2 band Enhanced Vegetation Index
`NDVI`			Normalized Difference Vegetation Index
`NIR_reflectance`		846-885nm	Near-infrared Radiation reflectance
`SWIR1_reflectance`		1230-1250nm	Shortwave Infrared Radiation reflectance
`SWIR2_reflectance`		1580-1640nm	Shortwave Infrared Radiation reflectance
`SWIR3_reflectance`		2225-2275nm	Shortwave Infrared Radiation reflectance
`VI_Quality`			Quality Assessment (QA) bit-field.
Bitmask for VI_Quality Bits 0-1: MODLAND_QA 0: VI produced, good quality 1: VI produced, but check other QA 2: Pixel produced, but probably cloudy 3: Pixel not produced due to other reason than clouds Bits 2-5: VI Usefulness, higher values are worse. 0: Highest Quality 1: Lower quality 2: Decreasing quality 3: Decreasing quality 4: Decreasing quality 5: Decreasing quality 6: Decreasing quality 7: Decreasing quality 8: Decreasing quality 9: Decreasing quality 10: Decreasing quality 11: Decreasing quality 12: Worst quality 13: Quality so low that it is not useful 14: L1B data faulty 15: Not useful for any reason/not processed Bits 6-7: Aerosol quantity 0: Climatology 1: Low 2: Average 3: High Bit 8: Adjacent cloud detected 0: No 1: Yes Bit 9: Adjacent BRDF correction performed 0: No 1: Yes Bit 10: Mixed clouds 0: No 1: Yes Bits 11-13: Land/Water Flag 0: land & desert 1: land no desert 2: inland water 3: sea_water 5: coastal Bit 14: Possible snow/ice 0: No 1: Yes Bit 15: Possible shadow 0: No 1: Yes
`red_reflectance`		600-680nm	Red band reflectance
`green_reflectance`		545-656nm	Green band reflectance
`blue_reflectance`		478-498nm	Blue band reflectance
`composite_day_of_the_year`	d		Julian day of year
`pixel_reliability`			Pixel usefulness using a simple rank class
`relative_azimuth_angle`	deg		Relative azimuth angle for each pixel
`sun_zenith_angle`	deg		Sun zenith angle for each pixel
`view_zenith_angle`	deg		View zenith angle for each pixel

pixel_reliability Class Table

Value	Color	Description
0		Excellent
1		Good
2		Acceptable
3		Marginal
4		Pass
5		Questionable
6		Poor
7		Cloud Shadow
8		Snow/Ice
9		Cloud
10		Estimated
11		LTAVG (taken from database)

Terms of Use

Terms of Use

LP DAAC NASA data are freely accessible; however, when an author publishes these data or works based on the data, it is requested that the author cite the datasets within the text of the publication and include a reference to them in the reference list.

Citations

Please visit LP DAAC 'Citing Our Data' page for information on citing LP DAAC datasets.

DOIs

https://doi.org/10.5067/VIIRS/VNP13A1.002

Explore with Earth Engine

Code Editor (JavaScript)

var dataset = ee.ImageCollection('NASA/VIIRS/002/VNP13A1')
                  .filter(ee.Filter.date('2017-05-01', '2017-06-30'));
var rgb = dataset.select(['EVI']);
var rgbVis = {
  min: 0.0,
  max: 1.0,
  palette: ['000000', '004400', '008800', '00bb00', '00ff00'],
};
Map.setCenter(17.93, 7.71, 6);
Map.addLayer(rgb, rgbVis, 'RGB');

Open in Code Editor

VNP13A1.002: VIIRS Vegetation Indices 16-Day 500m

NASA/VIIRS/002/VNP13A1, 16-day,evi,nasa,ndvi,noaa,npp,vegetation,viirs

2012-01-17T00:00:00Z/2024-11-24T00:00:00Z

Google Earth Engine

https://developers.google.com/earth-engine/datasets

https://doi.org/10.5067/VIIRS/VNP13A1.002