VNP15A2H v001

VIIRS/NPP Leaf Area Index/FPAR 8-Day L4 Global 500 m SIN Grid


PI: Ranga B. Myneni

Description

The Visible Infrared Imaging Radiometer Suite (VIIRS) Leaf Area Index (LAI) and Fraction of Photosynthetically Active Radiation (FPAR) Version 1 data product provides information about the vegetative canopy layer at 500 meter resolution (VNP15A2H). The VIIRS sensor is located onboard the NOAA/NASA joint Suomi National Polar-Orbiting Partnership (S-NPP) satellite. LAI is an index that quantifies the one-sided leaf area of a canopy, while FPAR is the fraction of incoming solar energy absorbed through photosynthesis at 400 to 700 nanometers. This product is intentionally designed after the Terra and Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) LAI/FPAR operational algorithm to promote the continuity of the Earth Observation System (EOS) mission.

The VNP15A2H product includes six Science Data Set Layers for the analysis of key factors in LAI/FPAR measurements. These include the LAI and FPAR measurements, quality detail for LAI/FPAR, extra quality detail for FPAR, and the standard deviation for LAI and FPAR. Two low resolution browse images are also available for each VNP15A2H granule: LAI and FPAR.

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Characteristics

Product Maturity

Validation at stage 1 has been achieved for the VIIRS LAI/FPAR products.

Collection and Granule

Collection

Characteristic Description
CollectionS-NPP VIIRS
DOI10.5067/VIIRS/VNP15A2H.001
File Size~35 MB
Temporal ResolutionMulti-Day
Temporal Extent2012-01-19 to Present
Spatial ExtentGlobal
Coordinate SystemSinusoidal
DatumN/A
File FormatHDF-EOS5
Geographic Dimensions1200 km x 1200 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers6
Columns/Rows2400 x 2400
Pixel Size500 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
Fpar Fraction of Photosynthetically Active Radiation N/A 8-bit unsigned integer 249 to 255 N/A 0 to 100 0.01
FparExtra_QC Pass-through Quality Control (QC) for FPAR Class Flag 8-bit unsigned integer 255 N/A 0 to 254 N/A
FparLai_QC Quality for LAI and FPAR Class Flag 8-bit unsigned integer 255 N/A 0 to 254 N/A
FparStdDev Standard deviation of FPAR N/A 8-bit unsigned integer 248 to 255 N/A 0 to 100 0.01
Lai Leaf Area Index m²/m² 8-bit unsigned integer 249 to 255 N/A 0 to 100 0.1
LaiStdDev Standard deviation for LAI m²/m² 8-bit unsigned integer 248 to 255 N/A 0 to 100 0.1

LAI and FPAR Fill Values

Value Description
249 land cover assigned as “unclassified” or not able to determine
250 land cover assigned as urban/built−up
251 land cover assigned as “permanent” wetlands/inundated marshlands
252 land cover assigned as perennial snow, ice
253 land cover assigned as barren, sparse vegetation (rock, tundra, desert)
254 land cover assigned as perennial salt or inland fresh water
255 Fillvalue, assigned when: the VNP09GA surface reflectance for channels VIS, NIR was assigned as Fillvalue, or land cover pixel itself was assigned Fillvalue of 255 or 254

LAIStdDev and FPARStdDev Fill Values

Value Description
248 No standard deviation available, pixel produced using backup method
249 land cover assigned as “unclassified” or not able to determine
250 land cover assigned as urban/built−up
251 land cover assigned as “permanent” wetlands/inundated marshlands
252 land cover assigned as perennial snow, ice
253 land cover assigned as barren, sparse vegetation (rock, tundra, desert)
254 land cover assigned as perennial salt or inland fresh water
255 Fillvalue, assigned when: the VNP09GA surface reflectance for channels VIS, NIR was assigned as Fillvalue, or land cover pixel itself was assigned Fillvalue of 255 or 254

Product Quality

The bit field mappings for QC layers are provided in Sections 4.2 Tables 4-5 of the User Guide.

For complete information about product quality, refer to the VIIRS Land Product Quality Assessment website.

Documentation

Using the Data

E-Learning

Land Ho! Exploring Earth’s Land Surface with Suomi NPP NASA VIIRS Land Data

Access Data

Citation

DOI: 10.5067/VIIRS/VNP15A2H.001

About the Image

The VNP15A2H LAI/FPAR product over Lake Titicaca, Peru, August 30 - September 6, 2018.

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