MOD09Q1 V006: Terra MODIS 8-Day Global Surface Reflectance at 250m

MODIS/Terra Surface Reflectance 8-Day L3 Global 250m SIN Grid V006 provides atmospherically corrected surface spectral reflectance for MODIS Bands 1 and 2. The data is produced by the National Aeronautics and Space Administration (NASA) and was decommissioned on July 31, 2023, with users directed to the updated Version 6.1 product. Each pixel value is selected from all acquisitions within an 8-day composite period based on criteria including cloud cover and solar zenith angle.

Use Cases

• Monitoring land surface changes based on 8-day composite reflectance values.
• Assessing vegetation health using atmospherically corrected spectral bands.
• Inputting surface reflectance data into downstream BRDF/Albedo or Vegetation Index products.
• Analyzing surface properties with the provided quality assurance (QA) layers for pixel reliability.

Strengths

• Data is corrected for atmospheric conditions such as gasses, aerosols, and Rayleigh scattering.
• Includes two quality layers alongside the 250-meter surface reflectance bands for assessment.
• Pixel selection uses criteria including cloud and solar zenith to optimize composite quality.

Limitations

• The dataset was decommissioned on July 31, 2023, indicating it is a legacy version.
• Known issues include potential striping from a dead detector in 2000 and possible incorrect 'High Aerosol' flagging.
• Column-level documentation is absent; field semantics must be inferred after download.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Satellite observations from the Terra MODIS instrument, composited over 8-day periods.

Time Range

Coverage includes data from at least February 2000 onward, with noted corrections after November 1,我们发现2000.

Freshness

Last updated 2026-03-13 00:09:56.536502; freshness should be verified as the product version is decommissioned.

Geography

Global coverage using the SIN Grid projection.