AST_09_003

ASTER L2 Surface Radiance VNIR and SWIR V003

Version 003 eng
  • Abstract
    The ASTER L2 Surface Radiance is a multi-file product that contains atmospherically corrected data for both the Visible Near-Infrared (VNIR) and Shortwave Infrared (SWIR) sensors. Each product delivery includes two HDF files: one for the VNIR, and the other for the SWIR. They are distinguished from one another by a one-second difference in the production time that appears as part of the file name. The more obvious distinguishing feature is the file size. VNIR is always the bigger of the two. Users are advised that ASTER SWIR data acquired from late April 2008 to the present exhibit anomalous saturation of values and anomalous striping. This effect is also present for some prior acquisiton periods. Please refer to the ASTER SWIR User Advisory Document (https://lpdaac.usgs.gov/sites/default/files/public/aster/docs/ASTER_SWIR_User_Advisory_July%2018_08.pdf) for more details. VNIR & SWIR Descriptions The ASTER L2 Surface Radiance (VNIR) is a higher-level product that contains atmospherically corrected visible and near-infrared data. It is generated using the 3 VNIR bands (between 0.52 and 0.86 µm) from an ASTER Level-1B image. The ASTER L2 Surface Radiance (SWIR Crosstalk-Uncorrected) is a higher-level product that contains atmospherically corrected shortwave infra-red data. It is generated using the 6 SWIR bands (between 1.60 and 2.43 µm) from an ASTER Level-1B image.Atmospheric correction involves deriving a relationship between the surface radiance/reflectance and the top of the atmosphere radiance from information on the scattering and absorbing characteristics of the atmosphere. Once this relationship is established, it is used to convert ASTER VNIR's original radiance values to atmospherically corrected surface radiance and reflectance values. The atmospheric correction algorithm for VNIR is based on a Look-Up Table (LUT) approach that uses results from a Gauss-Seidel iteration of the Radiative Transfer Code (RTC). This methodology is derived from the reflectance-based, vicarious calibration approach of the Remote Sensing Group at the University of Arizona. The algorithm is based on the relationship between the angular distribution of radiance, scattering and absorption in the atmosphere, and the surface properties. The RTC used to generate the LUT for the atmospheric correction is based on the following parameters: solar zenith angle, satellite view angle, relative azimuth angle between the satellite and sun, molecular scattering optical depth, aerosol scattering optical depth, aerosol scatter albedo, aerosol size distribution parameter, and surface reflectance. The size distributions for aerosol are based on either a Junge size distribution or on the set of aerosol types used in the atmospheric correction of Multi-angle Imaging Spectroradiometer (MISR) data.The initial versions of the algorithm rely on external climatological sources for information on atmospheric absorption and scattering parameters. Eventually, this information is likely to come from other Terra sensors like MISR and the Moderate-Resolution Imaging Spectroradiometer (MODIS). A digital elevation model provides the slope and elevation information for accurate modeling of surface reflectance. V003 data set release date: 2002-05-03 Data Set Characteristics VNIR: Area: ~60km x 60kmImage Dimensions: 4200 rows x 4980 columns File Size: 180 Megabytes Spatial Resolution: 15m Units: w/m2/sr/µm Projection: Universal Transverse Mercator (UTM) Data Format: HDF-EOS or GeoTIFF Data Fields: 3 Data Set Characteristics SWIR: Area: ~60 km x 60 km Image Dimensions: 2100 rows x 2490 columns File Size: ~75 Megabytes Spatial Resolution: 15m Units: w/m2/sr/µm Projection: Universal Transverse Mercator (UTM) Data Format: HDF-EOS or GeoTIFF Data Fields: 6
  • Version Description
    Not provided

Data Identification Fields:

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    Processing Level

    2

    ASTER Level 2 Surface Radiance Product

    Quality
    Users are advised that ASTER SWIR data acquired from late April 2008 to the present exhibit anomalous saturation of values and anomalous striping. This effect is also present for some prior acquisition periods. Please refer to the ASTER SWIR User Advisory Document (https://lpdaac.usgs.gov/sites/default/files/public/aster/docs/ASTER_SWIR_User_Advisory_July%2018_08.pdf) for more details.
    Collection Progress

    In Work

    Use Constraints
    See https://lpdaac.usgs.gov/dataset_discovery/aster/aster_policies for redistribution and citation policies.
    Access Constraints

    See https://lpdaac.usgs.gov/dataset_discovery/aster/aster_policies for data access information.

    Publication References
    • Publication reference title not provided
        Not provided
Related URLs
    Science Keywords
    • EARTH SCIENCE
    • SPECTRAL/ENGINEERING
    • INFRARED WAVELENGTHS
    • INFRARED FLUX
    • EARTH SCIENCE
    • SPECTRAL/ENGINEERING
    • INFRARED WAVELENGTHS
    • INFRARED IMAGERY
    • EARTH SCIENCE
    • SPECTRAL/ENGINEERING
    • INFRARED WAVELENGTHS
    • INFRARED RADIANCE
    • EARTH SCIENCE
    • SPECTRAL/ENGINEERING
    • VISIBLE WAVELENGTHS
    • VISIBLE FLUX
    • EARTH SCIENCE
    • SPECTRAL/ENGINEERING
    • VISIBLE WAVELENGTHS
    • VISIBLE IMAGERY
    • EARTH SCIENCE
    • SPECTRAL/ENGINEERING
    • VISIBLE WAVELENGTHS
    • VISIBLE RADIANCE
Other Descriptive Keywords
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Ancillary Keywords
  • LP DAAC
  • EOSDIS
  • USGS/EROS
  • ESIP
  • USGS
  • LPDAAC
ISO Topic Categories
  • imageryBaseMapsEarthCover
Additional Attributes
  • DAR_ID
    INT
    ID of the Data Acquisition Request
    Resolution Range Begin Range End Unit of Measure Accuracy

  • GenerationDateandTime
    DATETIME_STRING
    Date and Time granule produced
    Resolution Range Begin Range End Unit of Measure Accuracy

  • LowerLeftQuadCloudCoverage
    INT
    The percentage of cloud coverage for the lower left quadrant
    Resolution Range Begin Range End Unit of Measure Accuracy

  • LowerRightQuadCloudCoverage
    INT
    The percentage of cloud coverage for the lower right quadrant
    Resolution Range Begin Range End Unit of Measure Accuracy

  • SceneCloudCoverage
    INT
    Percentage of cloud coverage for the whole scene
    Resolution Range Begin Range End Unit of Measure Accuracy

  • Solar_Azimuth_Angle
    FLOAT
    Angle of the sun clockwise from true North
    Resolution Range Begin Range End Unit of Measure Accuracy

  • Solar_Elevation_Angle
    FLOAT
    Angle of the sun above the horizon
    Resolution Range Begin Range End Unit of Measure Accuracy

  • UpperLeftQuadCloudCoverage
    INT
    The percentage of cloud coverage for the upper left quadrant
    Resolution Range Begin Range End Unit of Measure Accuracy

  • UpperRightQuadCloudCoverage
    INT
    The percentage of cloud coverage for the upper right quadrant
    Resolution Range Begin Range End Unit of Measure Accuracy

  • Band4_Available
    STRING
    Identifies the status of Band 4 - [Yes, band is acquired] or [No, band was not acquired]
    Resolution Range Begin Range End Unit of Measure Accuracy

  • Band5_Available
    STRING
    Identifies the status of Band 5 - [Yes, band is acquired] or [No, band was not acquired]
    Resolution Range Begin Range End Unit of Measure Accuracy

  • Band6_Available
    STRING
    Identifies the status of Band 6 - [Yes, band is acquired] or [No, band was not acquired]
    Resolution Range Begin Range End Unit of Measure Accuracy

  • Band7_Available
    STRING
    Identifies the status of Band 7 - [Yes, band is acquired] or [No, band was not acquired]
    Resolution Range Begin Range End Unit of Measure Accuracy

  • Band8_Available
    STRING
    Identifies the status of Band 8 - [Yes, band is acquired] or [No, band was not acquired]
    Resolution Range Begin Range End Unit of Measure Accuracy

  • Band9_Available
    STRING
    Identifies the status of Band 9 - [Yes, band is acquired] or [No, band was not acquired]
    Resolution Range Begin Range End Unit of Measure Accuracy

  • RadiometricDBVersion
    STRING
    The version number of the Radiometric Database used in Level 1 processing.
    Resolution Range Begin Range End Unit of Measure Accuracy

  • GeometricDBVersion
    STRING
    The version number of the Geometric Database used in Level 1 processing.
    Resolution Range Begin Range End Unit of Measure Accuracy

  • ASTERGains
    STRING
    Identifies the Gain setting for the Bands: HGH, NOR, LO1, LO2, LOW, OFF
    Resolution Range Begin Range End Unit of Measure Accuracy

  • ASTERGRANULEID
    STRING
    Unique identifier for the data granule held at the ASTER GDS
    Resolution Range Begin Range End Unit of Measure Accuracy

  • ASTERProcessingCenter
    STRING
    Name of the center where these ASTER data were processed
    Resolution Range Begin Range End Unit of Measure Accuracy

  • ASTERVNIRPointingAngle
    FLOAT
    Specifies the pointing angle of the ASTER Visible Near Infrared (VNIR) sensor
    Resolution Range Begin Range End Unit of Measure Accuracy

  • ASTERSWIRPointingAngle
    FLOAT
    Specifies the pointing angle of the ASTER Shortwave Infrared (SWIR) sensor
    Resolution Range Begin Range End Unit of Measure Accuracy

  • ASTERMapOrientationAngle
    FLOAT
    Denotes the angle between the path oriented image and the map oriented image for this ASTER scene.
    Resolution Range Begin Range End Unit of Measure Accuracy
    -180.0 180.0

  • ASTERReceivingCenter
    STRING
    Name of the center where these ASTER data were received
    Resolution Range Begin Range End Unit of Measure Accuracy

  • ASTERSceneOrientationAngle
    FLOAT
    Denotes the azimuth angle made by the meridian at the ASTER scene center and the along-track direction, rotating from North toward East.
    Resolution Range Begin Range End Unit of Measure Accuracy
    0.0 180.0

  • source_granule_ur
    STRING
    Granule-ur of the source granule
    Resolution Range Begin Range End Unit of Measure Accuracy

  • metadata.uuid
    STRING
    Not provided
    Resolution Range Begin Range End Unit of Measure Accuracy

  • metadata.extraction_date
    STRING
    Not provided
    Resolution Range Begin Range End Unit of Measure Accuracy

  • metadata.keyword_version
    FLOAT
    Not provided
    Resolution Range Begin Range End Unit of Measure Accuracy

  • DIF9.0-to-DIF10-Converter
    STRING
    Not provided
    Resolution Range Begin Range End Unit of Measure Accuracy

  • Discipline
    STRING
    Not provided
    Resolution Range Begin Range End Unit of Measure Accuracy

  • IDN_Node.Short_Name
    STRING
    Not provided
    Resolution Range Begin Range End Unit of Measure Accuracy

  • IDN_Node.UUID
    STRING
    Not provided
    Resolution Range Begin Range End Unit of Measure Accuracy

  • Original.Dataset_Citation.DOI
    STRING
    Not provided
    Resolution Range Begin Range End Unit of Measure Accuracy

  • Original.Metadata_Version
    STRING
    Not provided
    Resolution Range Begin Range End Unit of Measure Accuracy

  • Original.Dataset_Language
    STRING
    Not provided
    Resolution Range Begin Range End Unit of Measure Accuracy

  • Original.xsi:schemaLocation
    STRING
    Not provided
    Resolution Range Begin Range End Unit of Measure Accuracy

Acquisition Information Fields:

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Platforms
  • Earth Observation Satellites
    TERRA
    Instruments
    • ASTER
Projects
Project Short Name Campaigns Project Dates
EOSDIS No campaigns listed. No dates provided.
ESIP No campaigns listed. No dates provided.

Temporal Information Fields:

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Spatial Information Fields:

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Location Keywords
    • GEOGRAPHIC REGION
    • GLOBAL

Data Centers

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  • LP DAAC
    ARCHIVER
    Land Processes Distributed Active Archive Center

    This data center does not have any addresses listed.

    This data center does not have any contact mechanisms listed.

Data Contacts

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  • Data Center Contact
    LP DAAC USER SERVICES

    LP DAAC

    LP DAAC User Services
    U.S. Geological Survey (USGS)
    Earth Resources Observation and Science (EROS) Center
    Sioux Falls, South Dakota 57198-0001

    • Email
    • (Toll Free) (866) 573-3222
    • (605) 594-6116
    • (605) 594-6963

Collection Citations Fields:

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