MOD021KM_5

MODIS/Terra Calibrated Radiances 5-Min L1B Swath 1km V005

Version 5 eng
  • Abstract
    The MODIS Level 1B data set contains calibrated and geolocated at-aperture radiances for 36 discrete bands located in the 0.4 to 14.4 micron region of electromagentic spectrum. These data are generated from the MODIS Level 1A scans of raw radiance and in the process converted to geophysical units of W/(m^2 um sr). In addition, the Earth Bi-directional Reflectance Distribution Function (BRDF) may be determined for the solar reflective bands (1-19, 26) through knowledge of the solar irradiance (e.g., determined from MODIS solar diffuser data, and from the target illumination geometry). Additional data are provided including quality flags, error estimates and calibration data. Visible, shortwave infrared, and near infrared measurements are only made during the daytime, while radiances for the thermal infrared region (bands 20-25, 27-36) are measured continuously. Channel locations for MODIS are as follows: Band Center Wavelength (um) Primary Use ---- ---------------------- ----------- 1 0.620 - 0.670 Land/Cloud Boundaries 2 0.841 - 0.876 Land/Cloud Boundaries 3 0.459 - 0.479 Land/Cloud Properties 4 0.545 - 0.565 Land/Cloud Properties 5 1.230 - 1.250 Land/Cloud Properties 6 1.628 - 1.652 Land/Cloud Properties 7 2.105 - 2.155 Land/Cloud Properties 8 0.405 - 0.420 Ocean Color/Phytoplankton 9 0.438 - 0.448 Ocean Color/Phytoplankton 10 0.483 - 0.493 Ocean Color/Phytoplankton 11 0.526 - 0.536 Ocean Color/Phytoplankton 12 0.546 - 0.556 Ocean Color/Phytoplankton 13 0.662 - 0.672 Ocean Color/Phytoplankton 14 0.673 - 0.683 Ocean Color/Phytoplankton 15 0.743 - 0.753 Ocean Color/Phytoplankton 16 0.862 - 0.877 Ocean Color/Phytoplankton 17 0.890 - 0.920 Atmospheric Water Vapor 18 0.931 - 0.941 Atmospheric Water Vapor 19 0.915 - 0.965 Atmospheric Water Vapor 20 3.660 - 3.840 Surface/Cloud Temperature 21 3.929 - 3.989 Surface/Cloud Temperature 22 3.929 - 3.989 Surface/Cloud Temperature 23 4.020 - 4.080 Surface/Cloud Temperature 24 4.433 - 4.498 Atmospheric Temperature 25 4.482 - 4.549 Atmospheric Temperature 26 1.360 - 1.390 Cirrus Clouds 27 6.535 - 6.895 Water Vapor Profile 28 7.175 - 7.475 Water Vapor Profile 29 8.400 - 8.700 Water Vapor Profile 30 9.580 - 9.880 Ozone Overburden 31 10.780 - 11.280 Surface/Cloud Temperature 32 11.770 - 12.270 Surface/Cloud Temperature 33 13.185 - 13.485 Cloud Top Altitude 34 13.485 - 13.785 Cloud Top Altitude 35 13.785 - 14.085 Cloud Top Altitude 36 14.085 - 14.385 Cloud Top Altitude Channels 1 and 2 have 250 m resolution, channels 3 through 7 have 500 m resolution, and the rest have 1 km resolution. However, for the MODIS L1B 1 km product, the 250 m and 500 m band radiance data and their associated uncertainties have been aggregated to 1 km resolution. Thus the entire channel data set is referenced to the same spatial and geolocation scales. Separate L1B products are available for the 250 m channels (MOD02QKM) and 500 m channels (MOD02HKM) that preserve the original resolution of the data. Spatial resolution for pixels at nadir is 1 km, degrading to 4.8 km in the along-scan direction at the scan extremes. However, thanks to the overlapping of consecutive swaths and respectively pixels there, the resulting resolution at the scan extremes is about 2 km. A 55 degree scanning pattern at the EOS orbit of 705 km results in a 2330 km orbital swath width and provides global coverage every one to two days. A single MODIS Level 1B granule will nominally contain a scene built from 203 scans (or swaths) sampled 1354 times in the cross-track direction, corresponding to approximately 5 minutes worth of data. Since an individual MODIS scan (or swath) will contain 10 along-track spatial elements, the scene will be composed of (1354 x 2030) pixels, resulting in a spatial coverage of (2330 km x 2030 km).Due to the MODIS scan geometry, there will be increasing overlap occurring beyond about 25 degrees scan angle. To summarize, the MODIS L1B 1 km data product consists of: 1. Calibrated radiances and uncertainties for (2) 250 m reflected solar bands aggregated to 1 km resolution 2. Calibrated radiances and uncertainties for (5) 500 m reflected solar bands aggregated to 1 km resolution 3. Calibrated radiances and uncertainties for (13) 1 km reflected solar bands and (16) infrared emissive bands 4. Geolocation subsampled at every 5th pixel across and along track 5. Satellite and solar angles subsampled at the above frequency 6. Comprehensive set of file-level metadata summarizing the spatial, temporal and parameter attributes of the data, as well as auxiliary information pertaining to instrument status and data quality characterization Users requiring the full-resolution geolocation and solar/satellite geometry can obtain the separate MODIS Level 1 Geolocation product (MOD03) from LAADS. The MODIS L1B data are stored in the Earth Observing System Hierarchical Data Format (HDF-EOS) which is an extension of HDF as developed by the National Center for Supercomputer Applications (NCSA) at the University of Illinois. A typical file size will be approximately 260 MB. Environmental information derived from MODIS L1B measurements will offer a comprehensive and unprecedented look at terrestrial, atmospheric, and ocean phenomenology for a wide and diverse community of users throughout the world. (The Shortname for this product is MOD021KM) The V004 Program Executable (PGE), for MODIS Level 1B products, has gone through a series of revisions since the initial release of V4.0.0 in March of 2002. These include revisions to make it LINUX-compatible. The current version is V4.0.9, which does not contain changes to the code that affect scientific output. Below is a brief overview of changes that affect scientific output in previous versions (V4.0.0 to V4.0.7) of PGE code. The MCST web site, listed in the URL section of this DIF, has a more detailed version of this information, including revisions that do not affect scientific output. Significant changes to Look Up Tables (LUT) used in Level 1B processing have occurred. These include revising the Response-versus-Scan Angle (RVS) LUTs from listing the RVS corrections to listing the quadratic coefficients used in making the RVS correction. The coefficients are now calculated by interpolating on the granule collection time and the RVS corrections are then generated using the interpolated coefficients. Previously used Emissive and Reflective RVS LUT tables were eliminated and new ones introduced. An incorrect comparison between RVS coefficients for Thermal Emissivity Bands (TEB) and Reflective Solar Bands (RSB) was being made during the calculation of the RVS coefficients. This was replaced with a comparison between TEB coefficients. This error never resulted in an incorrect RVS correction but did lead to re-calculating the coefficients for each detector in a thermal band even if the coefficients were the same for all 10 detectors. A destriping algorithm for Band 26 devised by C. Moeller was implemented. A new time-dependent LUT was added which gives coefficients for a detector-specific cross-talk correction based on the aggregated Band 5 radiances. The Band 26 scaled integers are adjusted by the Band 5 correction term, which is the product of the Band 5 radiance times the ratio of the Band 5 to Band 26 scaling factors times the LUT correction value for that detector. In addition a new LUT which allows for a frame offset with regard to the Band 5 radiance was added. A LUT which switches the correction off or on was also added. Data set information: MODIS Homepage http://modis.gsfc.nasa.gov/data/dataprod/ and MODIS Characterization Support Team http://mcst.gsfc.nasa.gov/
  • Purpose
    Science Research
  • Version Description
    Terra MODIS Version 5 Data Collection Reprocessing

Data Identification Fields:

Toggle Data Identification Fields
    Data Dates
    Creation
    Processing Level

    1B

    Quality
    See http://modaps.nascom.nasa.gov/services/qa/
    Collection Progress

    In Work

    Use Constraints
    None
    Access Constraints

    None

Related URLs
    Science Keywords
    • EARTH SCIENCE
    • SPECTRAL/ENGINEERING
    • INFRARED WAVELENGTHS
    • INFRARED RADIANCE
    • EARTH SCIENCE
    • SPECTRAL/ENGINEERING
    • INFRARED WAVELENGTHS
    • REFLECTED INFRARED
    • EARTH SCIENCE
    • SPECTRAL/ENGINEERING
    • INFRARED WAVELENGTHS
    • THERMAL INFRARED
    • EARTH SCIENCE
    • SPECTRAL/ENGINEERING
    • VISIBLE WAVELENGTHS
    • VISIBLE RADIANCE
Other Descriptive Keywords
Toggle Other Descriptive Keywords Fields
ISO Topic Categories
  • IMAGERY/BASE MAPS/EARTH COVER
Additional Attributes
  • SCI_ABNORM
    INT
    Flag set (to 0) if science_abnormal, the L1A engineering data ground-set flag that indicates potentially abnormal science data due to things other than MODIS (such as maneuvers, data link, etc.), was set for at least one scan in the granule.
    Resolution Range Begin Range End Unit of Measure Accuracy

  • VeryHighConfidentClearPct
    FLOAT
    None
    Resolution Range Begin Range End Unit of Measure Accuracy

  • SuccessfulRetrievalPct_Land
    FLOAT
    None
    Resolution Range Begin Range End Unit of Measure Accuracy

  • SuccessfulRetrievalPct_Ocean
    FLOAT
    None
    Resolution Range Begin Range End Unit of Measure Accuracy

  • SuccessfulRetrievalPct_IR
    FLOAT
    None
    Resolution Range Begin Range End Unit of Measure Accuracy

  • SuccessfulRetrievalPct_NIR
    FLOAT
    None
    Resolution Range Begin Range End Unit of Measure Accuracy

  • CloudCoverFractionPct_VIS
    FLOAT
    None
    Resolution Range Begin Range End Unit of Measure Accuracy

  • IceCloudDetectedPct_VIS
    FLOAT
    None
    Resolution Range Begin Range End Unit of Measure Accuracy

  • SuccessCloudOptPropRtrPct_VIS
    FLOAT
    None
    Resolution Range Begin Range End Unit of Measure Accuracy

  • SuccessCloudPhaseRtrPct_IR
    FLOAT
    None
    Resolution Range Begin Range End Unit of Measure Accuracy

  • SuccessCloudTopPropRtrPct_IR
    FLOAT
    None
    Resolution Range Begin Range End Unit of Measure Accuracy

  • SuccessfulRetrievalPct
    FLOAT
    None
    Resolution Range Begin Range End Unit of Measure Accuracy

  • ClearPct250m
    FLOAT
    None
    Resolution Range Begin Range End Unit of Measure Accuracy

  • CloudCoverPct250m
    FLOAT
    None
    Resolution Range Begin Range End Unit of Measure Accuracy

  • HighConfidentClearPct
    FLOAT
    None
    Resolution Range Begin Range End Unit of Measure Accuracy

  • LowConfidentClearPct
    FLOAT
    None
    Resolution Range Begin Range End Unit of Measure Accuracy

  • SCI_STATE
    INT
    Flag set (to 0) if science_state, the L1A engineering data flag that indicates the Normal/Test configuration of the MODIS instrument, was set for at least one scan in the granule.
    Resolution Range Begin Range End Unit of Measure Accuracy

Acquisition Information Fields:

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

Toggle Data Centers
  • NASA/GSFC/SED/ESD/BSL/MCST
    ORIGINATOR
    MODIS Characterization Support Team (MCS), Biospheric Sciences Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA

    This data center does not have any addresses listed.

    This data center does not have any contact mechanisms listed.

  • NASA/GSFC/SED/ESD/HBSL/BISB/MODAPS
    PROCESSOR
    MODIS Adaptive Processing System, Biospheric Information Systems Branch, Hydrospheric and Biospheric Sciences Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA

    This data center does not have any addresses listed.

    This data center does not have any contact mechanisms listed.

  • NASA/GSFC/SED/ESD/HBSL/BISB/LAADS
    DISTRIBUTOR
    L1 and Atmosphere Archive and Distribution System,Biospheric Information Systems Branch, Hydrospheric and Biospheric Sciences Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA

    This data center does not have any addresses listed.

    This data center does not have any contact mechanisms listed.

Data Contacts

Toggle Data Contacts
  • ASAD
    Metadata Author
    ASAD ULLAH

    This contact does not have any addresses listed.

  • MODIS Characterization Support Team (MCS)
    Technical Contact
    MODIS Characterization Support Team (MCS)

    This contact does not have any addresses listed.

  • MODAPS USER SUPPORT TEAM
    Technical Contact
    MODAPS USER SUPPORT TEAM

    MODAPS User Support Team
    NASA/GSFC
    Mail Code: 619
    Greenbelt, MD 20771

    • Email
    • 1-800-596-8132
    • 301-794-7035
  • MODIS Characterization Support Team (MCS)
    Data Center Contact
    MODIS Characterization Support Team (MCS)

    NASA/GSFC/SED/ESD/BSL/MCST

    This contact does not have any addresses listed.

  • MODAPS USER SUPPORT TEAM
    Data Center Contact
    MODAPS USER SUPPORT TEAM

    NASA/GSFC/SED/ESD/HBSL/BISB/MODAPS

    MODAPS User Support Team
    NASA/GSFC
    Mail Code: 619
    Greenbelt, MD 20771

    • Email
    • 1-800-596-8132
    • 301-794-7035
  • MODAPS USER SUPPORT TEAM
    Data Center Contact
    MODAPS USER SUPPORT TEAM

    NASA/GSFC/SED/ESD/HBSL/BISB/LAADS

    MODAPS User Support Team
    NASA/GSFC
    Mail Code: 619
    Greenbelt, MD 20771

    • Email
    • 1-800-596-8132
    • 301-794-7035

Collection Citations Fields:

Toggle Collection Citations Fields