MCD15A3H v006

MODIS/Terra+Aqua Leaf Area Index/FPAR 4-Day L4 Global 500 m SIN Grid


PI: Ranga Myneni

Description

The MCD15A3H Version 6 Moderate Resolution Imaging Spectroradiometer (MODIS) Level 4, Combined Fraction of Photosynthetically Active Radiation (FPAR), and Leaf Area Index (LAI) product is a 4-day composite data set with 500 meter pixel size. The algorithm chooses the best pixel available from all the acquisitions of both MODIS sensors located on NASA’s Terra and Aqua satellites from within the 4-day period.

LAI is defined as the one-sided green leaf area per unit ground area in broadleaf canopies and as one-half the total needle surface area per unit ground area in coniferous canopies. FPAR is defined as the fraction of incident photosynthetically active radiation (400-700 nm) absorbed by the green elements of a vegetation canopy.

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Characteristics

Improvements/Changes from Previous Versions

  • The Version 6 product uses the daily Level 2 Gridded (L2G)-lite surface reflectance as input as opposed to MODAGAGG, a MODIS daily aggregated surface reflectance product, used in Version 5
  • Products are generated at native resolution of 500 meters rather than the 1,000 meters of the Version 5.
  • Version 6 uses an improved multi-year land cover product.

Product Maturity

The LAI product has attained stage 2 validation and the FPAR product has attained stage 1 validation.

Collection and Granule

Collection

Characteristic Description
CollectionCombined MODIS
DOI10.5067/MODIS/MCD15A3H.006
File Size~3.7 MB
Temporal ResolutionMulti-Day
Temporal Extent2002-07-04 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) 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_500m¹ Fraction of Photosynthetically Active Radiation Percent 8-bit unsigned integer 249 to 255 N/A 0 to 100 0.01
Lai_500m¹ Leaf Area Index m²/m² 8-bit unsigned integer 249 to 255 N/A 0 to 100 0.1
FparLai_QC Quality for  FPAR and LAI Class Flag 8-bit unsigned integer 255 N/A 0 to 254 N/A
FparExtra_QC Extra detail Quality for  FPAR and LAI Class Flag 8-bit unsigned integer 255 N/A 0 to 254 N/A
FparStdDev_500m² Standard deviation of  FPAR Percent 8-bit unsigned integer 248 to 255 N/A 0 to 100 0.01
LaiStdDev_500m² Standard deviation of LAI m²/m² 8-bit unsigned integer 248 to 255 N/A 0 to 100 0.1

¹The LAI and FPAR fill value legends are provided in the User Guide on page 10.

²The LAI and FPAR standard deviation fill value legends are Provided in the User Guide on page 11.

Product Quality

The QC 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 the QC layers.

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

The QC bitmap for the QC layer is provided in the User Guide on pages 8 and 9.

Known Issues

For complete information about the MCD15A2H known issues refer to the MODIS Land Quality Assessment website.

Documentation

Using the Data

E-Learning

Observing Land from Space: Interacting with Geospatial Data from NASA's LP DAAC

Navigating NASA's LP DAAC to Find Answers to your Deepest Land Data Questions

Data In Action

Detecting Vegetation Loss in Hail Scars using MODIS Imagery and AppEEARS

Highlights from the Literature: July to September 2019

Tools

Citation

DOI: 10.5067/MODIS/MCD15A3H.006

About the Image

Combined MODIS Leaf Area Index (LAI) data from the MCD15A3H product over Lake Titicaca, Bolivia, August 21 -24, 2018.

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