MODIS/Aqua Surface Reflectance 8-Day L3 Global 500m SIN Grid V006

Description

The MYD09A1 Version 6 data product was decommissioned on July 31, 2023. Users are encouraged to use the [MYD09A1 Version 6.1](https://doi.org/10.5067/MODIS/MYD09A1.061) data product. The Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua MYD09A1 Version 6 product provides an estimate of the surface spectral reflectance of Aqua MODIS Bands 1 through 7 corrected for atmospheric conditions such as gasses, aerosols, and Rayleigh scattering. Along with the seven 500 meter (m) reflectance bands are a quality variable and four observation bands. 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’](https://landweb.modaps.eosdis.nasa.gov/displayissue?id=174) 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](https://landweb.modaps.eosdis.nasa.gov/data/userguide/LSRHighAerosolFlagFinal.pdf) were implemented in Collection 6.1 reprocessing. * 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=6). 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.

Resources

Name Format Description Link
5 MYD09A1.006 https://doi.org/10.5067/MODIS/MYD09A1.006
5 https://www.earthdata.nasa.gov/centers/lp-daac
33 MOD09_User_Guide_V6.pdf https://lpdaac.usgs.gov/documents/306/MOD09_User_Guide_V6.pdf
33 MOD09_ATBD.pdf https://lpdaac.usgs.gov/documents/305/MOD09_ATBD.pdf
5 https://ladsweb.modaps.eosdis.nasa.gov/filespec/MODIS/6/MYD09A1
5 https://landweb.modaps.eosdis.nasa.gov/
5 https://search.earthdata.nasa.gov%2Fsearch%3Fq%3DC2763370199-LPCLOUD
5 https://doi.org%2F10.5067%2FMODIS%2FMYD09A1.006
5 https://lpdaac.usgs.gov%2F
5 https://lpdaac.usgs.gov%2Fdocuments%2F306%2FMOD09_User_Guide_V6.pdf
5 https://lpdaac.usgs.gov%2Fdocuments%2F305%2FMOD09_ATBD.pdf
5 https://ladsweb.modaps.eosdis.nasa.gov%2Ffilespec%2FMODIS%2F6%2FMYD09A1
5 https://e4ftl01.cr.usgs.gov%2FWORKING%2FBRWS%2FBrowse.001%2F2019.06.27%2FBROWSE.MYD09A1.A2019169.h12v10.006.2019178033736.1.jpg
5 https://landweb.modaps.eosdis.nasa.gov%2F
5 https://www.earthdata.nasa.gov%2Fcenters%2Flp-daac
5 https://landweb.modaps.eosdis.nasa.gov
0 The metadata's original source. https://cmr.earthdata.nasa.gov/search/concepts/C2763370199-LPCLOUD.iso19115

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  • earth-science-surface-radiative-properties-land-surface-reflectance

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