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Description

The MYD09Q1 Version 6 data product was decommissioned on July 31, 2023. Users are encouraged to use the MYD09Q1 Version 6.1 data product.

The MYD09Q1 Version 6 product provides an estimate of the surface spectral reflectance of Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) Bands 1 and 2, corrected for atmospheric conditions such as gasses, aerosols, and Rayleigh scattering. Provided along with the 250 meter (m) surface reflectance bands are two quality layers. For each pixel, a value is selected from all the acquisitions within the 8-day composite period. The criteria for the pixel choice include cloud and solar zenith. When several acquisitions meet the criteria the pixel with the minimum channel 3 (blue) value is used.

Known Issues

  • The Collection 6 MODIS Land Surface Reflectance product (MYD09) may incorrectly flag retrievals as ‘High Aerosol’ over brighter surfaces and at higher view angles. This will impact the downstream MODIS BRDF/Albedo (MCD43) and Vegetation Index (MOD13 and MYD13) data products which use the aerosol quantity flag to screen out high aerosol values.
  • Corrections were implemented in Collection 6.1 reprocessing.
  • For complete information about known issues please refer to the MODIS/VIIRS Land Quality Assessment website.

Improvements/Changes from Previous Versions

  • Improvements to the aerosol retrieval and correction algorithm along with new aerosol retrieval look-up tables.
  • Refinements to the internal snow, cloud, and cloud shadow detection algorithms. Uses Bidirectional Reflectance Distribution Function (BRDF) database to better constrain the different threshold used.
  • Processes ocean bands to create a new Surface Reflectance Ocean product and provides Quality Assurance (QA) datasets for these bands.
  • Improved discrimination of salt pans from cloud and snow, along with the inclusion of a salt pan flag in the QA band.

Version Description

The MYD09Q1 Version 6 data product was decommissioned on July 31, 2023. Users are encouraged to use the MYD09Q1 Version 6.1 data product (https://doi.org/10.5067/MODIS/MYD09Q1.061).

Product Summary

Platforms
Aqua
Instruments
MODIS
Spatial Extent
N: 90 S: -90 E: 180 W: -180
Spatial Resolution
250 Meters x 250 Meters
Geographic Region
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2002-07-04 to 2023-02-26
Temporal Resolution
8 Day
Data Partner
Land Processes Distributed Active Archive Center (LP DAAC)
MODIS Adaptive Processing System, Terrestrial Information Systems Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/TISL/MODAPS)
Concept ID
C2763370203-LPCLOUD
Data State
DEPRECATED
Processing Level
3
Published
Updated
Science Keywords
Reflectance

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Vermote, E. (2015). MYD09Q1 MODIS/Aqua Surface Reflectance 8-Day L3 Global 250m SIN Grid V006 [Data set]. NASA Land Processes Distributed Active Archive Center. https://doi.org/10.5067/MODIS/MYD09Q1.006 Date Accessed: 2025-11-01

File Naming Convention

MYD09Q1.A2002273.h17v00.006.2015151155449.hdf

The file name begins with the Product Short Name (MYD09Q1) followed by the Julian Date of Acquisition formatted as AYYYYDDD (A2002273), the Tile Identifier which is horizontal tile and vertical tile provided as hXXvYY (h17v00), the Version of the data collection (006), the Julian Date and Time of Production designated as YYYYDDDHHMMSS (2015151155449), and the Data Format (hdf).

Documents

SHOWING 1 OF 1

Publications Citing This Dataset

Filters
Title Year Author
Relationship between MODIS derived NDVI and yield of cereals for selected European countries Panek, E.
Analysis of forest stand resistance to insect attack according to remote sensing data Kovalev, A.
Using multi-temporal satellite data to analyse phenological responses of rubber (Hevea brasiliensis) to climatic variations in South Sumatra, Indonesia Azizan, F. A.
Modeling gross primary production of midwestern us maize and soybean croplands with satellite and gridded weather data Malek-Madani, G.
The use of satellite information (MODIS / Aqua) for phenological and classification analysis of plant communities Ivanova, Y.
Comparing the accuracy of MODIS data products for vegetation detection between two environmentally dissimilar ecoregions—the Chocó-Darien of South America and the Great Basin of North America Fagua, J. C.
Suspended solids in the gulf of Urabá Colombia – Annual Average estimation using MODIS MYD09Q1 images Carrillo, I.
Performance of smoothing methods for reconstructing NDVI time-series and estimating vegetation phenology from MODIS data Cai, Z. Z.
Analysis and attribution of trends in water levels in the Vietnamese Mekong Delta Fujihara, Y.
Monitoring water turbidity and surface suspended sediment concentration of the Bagre Reservoir (Burkina Faso) using MODIS and field reflectance data Robert, E.
SHOWING 10 OF 12

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
sur_refl_b01 Surface Reflectance Band 1 N/A int16 -28672 -28672 to 16000 0.0001
sur_refl_b02 Surface Reflectance Band 2 N/A int16 -28672 -28672 to 16000 0.0001
sur_refl_qc_250m Surface Reflectance 250m Band Quality Control flags Bit Field uint16 65535 65535 to 32767 N/A
sur_refl_state_250m Surface Reflectance 250m State flags Bit Field uint16 65535 65535 to 57343 N/A
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