MOD02QKM_5

MODIS/Terra Calibrated Radiances 5-Min L1B Swath 250m V005

Version 5 eng
  • Abstract
    The 250 meter MODIS Level 1B data set contains calibrated and geolocated at-aperture radiances for 2 discrete bands located in the 0.62 to 0.88 micron region of the electromagnetic 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 these solar reflective bands 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. Channel locations for the MODIS 250 meter data 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 Separate L1B products are available for the five 500 m resolution channels (MOD02HKM) and the twenty-nine 1 km resolution channels (MOD021KM). For the 500 m product, there are actually seven channels available since the data from the two 250 m channels have been aggregated to 500 m resolution. Similarly, for the 1 km product, all 36 MODIS channels are available since the data from the two 250 m and five 500 m channels have been aggregated into equivalent 1 km pixel values. Spatial resolution for pixels at nadir is 250 m, degrading to 1.2 km in the along-scan direction and 0.5 km in the along-track direction for pixels located at the scan extremes. 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 250 m granule will contain a scene built from 203 scans sampled 5416 times in the cross-track direction, corresponding to approximately 5 minutes worth of data; thus 288 granules will be produced per day. Since an individual MODIS scan will contain 40 along-track spatial elements for the 250 m channels, the scene will be composed of (5416 x 8120) pixels, resulting in a spatial coverage of (2330 km x 2040 km). Due to the MODIS scan geometry, there will be increasing scan overlap beyond about 17 degrees scan angle. To summarize, the MODIS L1B 250 m data product consists of: 1. Calibrated radiances and uncertainties for (2) 250 m reflected solar bands 2. Subsampled geolocation at every 4th 250 m pixel across and along track, i.e., a geolocation point every kilometer 3. Satellite and solar angles subsampled at the above frequency 4. Calibration data for all channels (scale and offset) 5. 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 The MODIS L1B 250 m 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 170 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 MOD02QKM) 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. See the MODIS Science Team homepage for more data set information: http://modis.gsfc.nasa.gov/data/dataprod/
  • 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
    • 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:

Toggle Acquisition Information Fields
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:

Toggle Temporal Information Fields

Spatial Information Fields:

Toggle Spatial Information Fields
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