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Full catalog/MYD17A2HGF
MYD17A2HGF·v061·dataset

How fast plants are growing, gap-filled (Aqua, 8-day, 500 m)

MODIS/Aqua Gross Primary Productivity Gap-Filled 8-Day L4 Global 500m SIN Grid V061
biosphere NASA LPCLOUD Level 4 active HDF-EOS2
In plain English

What it measures. How fast plants are converting sunlight into growth (gross primary productivity) across the land, summed over each 8-day stretch at about 500 m detail. It also reports net photosynthesis after subtracting the energy plants spend keeping themselves alive.

How it's made. Derived from the MODIS instrument on NASA's Aqua satellite, then cleaned up at year's end by filling poor-quality pixels using interpolation, so it isn't available in near-real time.

How & where you'd use it. Used to study the land carbon cycle, vegetation health, and energy and water flows; the gap-filled version gives a cleaner record for season-to-season and year-to-year comparisons.

What's measured

BIOSPHERE › ECOLOGICAL DYNAMICS › ECOSYSTEM FUNCTIONS › PHOTOSYNTHESISBIOSPHERE › ECOLOGICAL DYNAMICS › ECOSYSTEM FUNCTIONS › PRIMARY PRODUCTIONBIOSPHERE › VEGETATION › VEGETATION PRODUCTIVITY

Coverage & cadence

  • Time span2002-01-01 → ongoing
  • Measured byAqua (MODIS)
  • Processing levelLevel 4
  • Spatial extent-180, -90, 180, 90
  • FormatsHDF-EOS2
  • StatusACTIVE

What you can do with it

  • Map vegetation, forests and biomass
  • Monitor ecosystem productivity and carbon
  • Support habitat and biodiversity studies
Official description

The MYD17A2HGF Version 6.1 Gross Primary Productivity (GPP) Gap-Filled product is a cumulative 8-day composite of values with 500 meter (m) pixel size based on the radiation use efficiency concept that can be potentially used as inputs to data models to calculate terrestrial energy, carbon, water cycle processes, and biogeochemistry of vegetation. The Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) data product includes information about GPP and Net Photosynthesis (PSN). The PSN band values are the GPP less the Maintenance Respiration (MR). The data product also contains a PSN Quality Control (QC) layer. The quality layer contains quality information for both the GPP and the PSN. The MYD17A2HGF will be generated at the end of each year when the entire yearly 8-day [MYD15A2H](https://doi.org/10.5067/modis/myd15a2h.061) is available. Hence, the gap-filled MYD17A2HGF is the improved MYD17, which has cleaned the poor-quality inputs from 8-day Leaf Area Index and Fraction of Photosynthetically Active Radiation (LAI/FPAR) based on the Quality Control (QC) label for every pixel. If any LAI/FPAR pixel did not meet the quality screening criteria, its value is determined through linear interpolation. However, users cannot get MYD17A2HGF in near-real time because it will be generated only at the end of a given year. Known Issues * Operational and uncertainty issues are provided under Section 2 in the User Guide. * For complete information about known issues please refer to the [MODIS/VIIRS Land Quality Assessment website](https://landweb.modaps.eosdis.nasa.gov/knownissue?sensor=MODIS&sat=Aqua&as=61).

Get the data

myd17a2hgf_access.py
import earthaccess
earthaccess.login(strategy="netrc")          # free Earthdata Login

results = earthaccess.search_data(
    short_name="MYD17A2HGF",
    version="061",
    bounding_box=(-122.5, 37.2, -121.8, 37.9),  # your area (W,S,E,N)
    temporal=("2024-01-01", "2024-12-31"),       # your dates
)
files = earthaccess.open(results)   # stream straight from LPCLOUD
Browsing CMR needs no login. Downloading or streaming bytes needs a free Earthdata Login + the earthaccess package.