![NASA/VIIRS/002/VNP13A1](https://developers.google.com/earth-engine/datasets/images/NASA/NASA_VIIRS_002_VNP13A1_sample.png) Dataset Availability : 2012-01-17T00:00:00Z--2026-10-24T00:00:00Z Dataset Producer : [NASA LP DAAC at the USGS EROS Center](https://doi.org/10.5067/VIIRS/VNP13A1.002) Cadence : 8 Days Tags : [16-day](https://developers.google.com/earth-engine/datasets/tags/16-day) [evi](https://developers.google.com/earth-engine/datasets/tags/evi) [nasa](https://developers.google.com/earth-engine/datasets/tags/nasa) [ndvi](https://developers.google.com/earth-engine/datasets/tags/ndvi) [noaa](https://developers.google.com/earth-engine/datasets/tags/noaa) [npp](https://developers.google.com/earth-engine/datasets/tags/npp) [vegetation](https://developers.google.com/earth-engine/datasets/tags/vegetation) [vegetation-indices](https://developers.google.com/earth-engine/datasets/tags/vegetation-indices) [viirs](https://developers.google.com/earth-engine/datasets/tags/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](https://landweb.modaps.eosdis.nasa.gov/browse?sensor=VIIRS&sat=SNPP) and see the [User Guide](https://lpdaac.usgs.gov/documents/1372/VNP13_User_Guide_ATBD_V2.1.2.pdf). Documentation: - [General Documentation](https://ladsweb.modaps.eosdis.nasa.gov/filespec/VIIRS/1/VNP13A1) ### Bands **Bands** Pixel size: 500 meters (all bands) | Name | Units | Pixel Size | Wavelength | Description | |---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---| | `EVI` | | 500 meters | None | 3 band Enhanced Vegetation Index | | `EVI2` | | 500 meters | None | 2 band Enhanced Vegetation Index | | `NDVI` | | 500 meters | None | Normalized Difference Vegetation Index | | `NIR_reflectance` | | 500 meters | 846-885nm | Near-infrared Radiation reflectance | | `SWIR1_reflectance` | | 500 meters | 1230-1250nm | Shortwave Infrared Radiation reflectance | | `SWIR2_reflectance` | | 500 meters | 1580-1640nm | Shortwave Infrared Radiation reflectance | | `SWIR3_reflectance` | | 500 meters | 2225-2275nm | Shortwave Infrared Radiation reflectance | | `VI_Quality` | | 500 meters | None | 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` | | 500 meters | 600-680nm | Red band reflectance | | `green_reflectance` | | 500 meters | 545-656nm | Green band reflectance | | `blue_reflectance` | | 500 meters | 478-498nm | Blue band reflectance | | `composite_day_of_the_year` | d | 500 meters | None | Julian day of year | | `pixel_reliability` | | 500 meters | None | Pixel usefulness using a simple rank class | | `relative_azimuth_angle` | deg | 500 meters | None | Relative azimuth angle for each pixel | | `sun_zenith_angle` | deg | 500 meters | None | Sun zenith angle for each pixel | | `view_zenith_angle` | deg | 500 meters | None | View zenith angle for each pixel | **pixel_reliability Class Table** | Value | Color | Description | |---|---|---| | 0 | None | Excellent | | 1 | None | Good | | 2 | None | Acceptable | | 3 | None | Marginal | | 4 | None | Pass | | 5 | None | Questionable | | 6 | None | Poor | | 7 | None | Cloud Shadow | | 8 | None | Snow/Ice | | 9 | None | Cloud | | 10 | None | Estimated | | 11 | None | 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 Citations: - Please visit [LP DAAC 'Citing Our Data' page](https://lpdaac.usgs.gov/citing_our_data) for information on citing LP DAAC datasets. ### DOIs - ### Explore with Earth Engine > [!NOTE] > **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine) ### Code Editor (JavaScript) ```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](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NASA/NASA_VIIRS_002_VNP13A1) [VNP13A1.002: VIIRS Vegetation Indices 16-Day 500m](https://developers.google.com/earth-engine/datasets/catalog/NASA_VIIRS_002_VNP13A1) 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 ... NASA/VIIRS/002/VNP13A1, 16-day,evi,nasa,ndvi,noaa,npp,vegetation,vegetation-indices,viirs 2012-01-17T00:00:00Z/2026-10-24T00:00:00Z -90 -180 90 180 Google Earth Engine https://developers.google.com/earth-engine/datasets - [https://doi.org/10.5067/VIIRS/VNP13A1.002](https://doi.org/https://doi.org/10.5067/VIIRS/VNP13A1.002) - [https://doi.org/10.5067/VIIRS/VNP13A1.002](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_VIIRS_002_VNP13A1)