MOD17A3H v006

MODIS/Terra Net Primary Production Yearly L4 Global 500 m SIN Grid


PI: Steve Running

Terra MODIS Net Primary Production Yearly L4 Global 500 m SIN Grid products are currently unavailable due to unexpected errors in the input data. Upon resolution of biases related to persistent cloud cover in the input Leaf Area Index/Fraction of Photosynthetically Active Radiation product, the MOD17A3H data will be reprocessed and made accessible from the LP DAAC. Users are encouraged to sign up for the LP DAAC listserv for future notifications on data availability.

Description

The MOD17A3H Version 6 product provides information about annual Net Primary Production (NPP) at 500 meter (m) pixel resolution. Annual NPP is derived from the sum of all 8-day Net Photosynthesis (PSN) products (MOD17A2H) from the given year. The PSN value is the difference of the Gross Primary Productivity (GPP) and the Maintenance Respiration (MR).

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Characteristics

Improvements/Changes from Previous Versions

  • The product uses updated Biome Property look-up tables (BPLUT) and an updated version of the daily Global Modeling and Assimilation Office (GMAO) meteorological data.
  • The products are now generated at the native resolution of 500 m using the Moderate Resolution Imaging Spectroradiometer (MODIS) Leaf Area Index (LAI)/Fraction of Photosynthetically Active Radiation (FPAR) (MOD15A2H) 8-day composite at 500 m resolution.

Product Maturity

Stage 3 validation has been achieved for MOD17 products.

Collection and Granule

Collection

Characteristic Description
CollectionTerra MODIS
DOI10.5067/MODIS/MOD17A3H.006
File Size~0.8 MB
Temporal ResolutionYearly
Temporal Extent2000-12-26 to Present
Spatial ExtentGlobal
Coordinate SystemSinusoidal
DatumN/A
File FormatHDF-EOS
Geographic Dimensions1200 km x 1200 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers2
Columns/Rows2400 x 2400
Pixel Size500 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
Npp_500m Net Primary Productivity kg C/m² 16-bit signed integer 32767 N/A -30000 to 32700 0.0001
Npp_QC_500m Quality Control Bits Bit Field 8-bit unsigned integer 255 N/A 0 to 254 N/A

Fill Value Classes

Value Description
32761 Land cover assigned as "unclassified" or not able to determine
32762 Land cover assigned as urban/built-up
32763 Land cover assigned as "permanent" wetlands/inundated marshland
32764 Land cover assigned as perennial snow, ice
32765 Land cover assigned as barren, sparse veg (rock, tundra, desert)
32766 Land cover assigned as perennial salt or inland fresh water
32767 Fill Value

Product Quality

The bit flags for the Npp_QC_500m Quality layer are provided in the MOD17A3H File Specification.

The quality layer is stored in an efficient bit-encoded manner. The unpack_sds_bits executable from the LDOPE Tools is available to the user community to help parse and interpret this layer.

In addition to data access and transformation processes, AppEEARS also has the capability to unpack and interpret the quality layer.

Known Issues

For complete information about the MOD17A3H known issues refer to the MODIS Land Quality Assessment website.

Documentation

Using the Data

Tools

Citation

DOI: 10.5067/MODIS/MOD17A3H.006

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