Aqua MODIS 8-Day Global Surface Reflectance at 500m

MODIS/Aqua MYD09A1 V006 provides atmospherically corrected surface spectral reflectance for seven 500-meter spectral bands, composited over 8-day periods. This NASA product is derived from the Aqua satellite's MODIS instrument, selecting the best pixel per period based on cloud cover and solar zenith angle. The dataset has been decommissioned, with users directed to the updated Version 6.1.

Use Cases

• Monitoring vegetation health and phenology by analyzing time-series of corrected reflectance in the red and near-infrared bands.
• Assessing land surface albedo and radiative properties using the seven surface reflectance bands.
• Providing corrected input data for generating downstream MODIS products like MCD43 BRDF/Albedo and MOD13/MYD13 Vegetation Indices.
• Studying aerosol impacts and performing atmospheric correction validation via the quality assurance bands and flags.

Strengths

• Provides atmospherically corrected reflectance for seven spectral bands at a 500-meter spatial resolution.
• Uses an 8-day compositing period with pixel selection criteria to minimize cloud contamination and solar zenith angle effects.
• Corrections for known issues, like the high aerosol flag error, were implemented in the subsequent Collection 6.1 reprocessing.

Limitations

• The Collection 6 version has a known issue incorrectly flagging retrievals as 'High Aerosol' over bright surfaces and high view angles.
• The dataset is decommissioned (as of July 31, 2023), indicating it is not the current operational version.
• Specific row counts, column details, and exact temporal coverage are not provided in the available metadata.

Provenance

Source

National Aeronautics and Space Administration (NASA)

Collection Method

Data acquired by the MODIS instrument on the Aqua satellite, processed to surface reflectance using atmospheric correction algorithms and composited over 8-day periods.

Time Range

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Freshness

2026-03-13 00:20:02.381140

Geography

Global