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    • MODIS/Aqua Cloud Mask and Spectral Test Results 5-Min L2 Swath 250m and 1km - NRT

    Metadata Updated: December 6, 2023

    The MODIS level-2 cloud mask product is a global product generated for both daytime and nighttime conditions at 1-km spatial resolution (at nadir) and for daytime at 250-m resolution. The algorithm employs a series of visible and infrared threshold and consistency tests to specify confidence levels that an unobstructed view of the Earth's surface is observed.

    The Terra MODIS Photovoltaic (PVLWIR) bands 27-30 are known to experience an electronic crosstalk contamination. The influence of the crosstalk has gradually increased over the mission lifetime, causing for example, earth surface features to become prominent in atmospheric band 27, increased detector striping, and long term drift in the radiometric bias of these bands. The drift has compromised the climate quality of C6 Terra MODIS L2 products that depend significantly on these bands, including cloud mask (MOD35), cloud fraction and cloud top properties (MOD06), and total precipitable water (MOD07). A linear crosstalk correction algorithm has been developed and tested by MCST.The electronic crosstalk correction was made to the calibration algorithm for bands 27-30 and implemented into C6.1 operational L1B processing. This implementation greatly improves the performance of the cloud mask.

    The shortname for this Level-2 MODIS cloud mask product is MYD35_L2 and the principal investigator for this product is MODIS scientist Dr. Paul Menzel ( paulm@ssec.wisc.edu). MYD35_L2 product files are stored in Hierarchical Data Format (HDF-EOS). Each of the 9 gridded parameters is stored as a Scientific Data Set (SDS) within the HDF-EOS file. The Cloud Mask and Quality Assurance SDS's are stored at 1 kilometer pixel resolution. All other SDS's (those relating to time, geolocation, and viewing geometry) are stored at 5 kilometer pixel resolution.

    MYD35_L2 Data Group and Parameters:

    Spatial and Temporal Resolution:

    Latitude and Longitude Scan start time

    Solar and Sensor Viewing Geometry:

    Solar zenith and Solar azimuth angle Sensor zenith and Sensor azimuth angle

    Science Parameters: Cloud Mask (1km) Cloud Mask (250 m)

    Quality Assurance Parameters: Quality Assurance Flags (1km)

    Link to the MODIS homepage for more data set information:

    https://modis-atmos.gsfc.nasa.gov/products/cloud-mask

    Link to the MODIS homepage for C6.1 changes:

    https://modis-atmos.gsfc.nasa.gov/documentation/collection-61

    Access & Use Information

    Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Created Date November 12, 2020
    Metadata Updated Date December 6, 2023

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date November 12, 2020
    Metadata Updated Date December 6, 2023
    Publisher NASA/GSFC/EOS/ESDIS/LANCEMODIS
    Maintainer
    Identifier C1427007141-LANCEMODIS
    Data First Published 2017-10-10
    Language en-US
    Data Last Modified 2023-07-20
    Category EOS, EOSDIS, ESIP, AQUA, geospatial
    Public Access Level public
    Bureau Code 026:00
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://data.nasa.gov/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Citation LANCEMODIS. 2017-10-20. MODIS/Aqua Cloud Mask and Spectral Test Results 5-Min L2 Swath 250m and 1km. Version 6.1NRT. MODAPS at NASA/GSFC. Archived by National Aeronautics and Space Administration, U.S. Government, The Land, Atmosphere Near real-time Capability for EOS (LANCE). https://doi.org/10.5067/MODIS/MYD35_L2.NRT.061. https://modis-atmos.gsfc.nasa.gov/products/cloud-mask.
    Creator LANCEMODIS
    Harvest Object Id 452cb608-6eb0-4c23-a44e-c2dbda8c0016
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://doi.org/10.5067/MODIS/MYD35_L2.NRT.061
    Metadata Type geospatial
    Old Spatial -180.0 -90.0 180.0 90.0
    Program Code 026:001
    Release Place MODAPS at NASA/GSFC
    Source Datajson Identifier True
    Source Hash 1f84d918818d34d2c0b530b07051a7a92a71ddf0a48b704883fe6fd2540fc4fc
    Source Schema Version 1.1
    Spatial
    Temporal 2017-10-20T00:00:00Z/2023-07-24T00:00:00Z

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