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MODIS/Terra Calibrated Radiances 5-Min L1B Swath 250m (MOD02QKM, Collection 004 and 005)
Entry ID: MOD02QKM


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Summary
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/

Related URL
Link: GET DATA > LAADS
Description: Web site for MODIS Collection 5 L1B, Geo and atmosphere
data ordering.
Web site for MODIS Collection 4 atmosphere data ordering.


Link: GET DATA > LAADS
Description: Access Collection 5 data set MOD02QKM from the LAADS FTP server.


Link: GET DATA > MODAPS
Description: Web site for MODIS Collection 4 L1B and Geo data ordering.


Link: GET DATA > LANCE
Description: Near real-time (NRT) data are available from MODAPS for certain Aqua and Terra MODIS L0, L1, L2, L2G, and L3 products. Whereas the standard MODIS forward processing acquires 2-hour L0 files for Aqua and Terra from EDOS within 7-8 hours of real time, LANCE-MODIS acquires session-based L0 files from EDOS and the end of the session is available within 10-30 minutes after real time.


Link: GET DATA > ECHO
Description: Refine your granule search with ECHO's next generation Earth Science discovery tool (Reverb) using information from this record.


Link: VIEW PROJECT HOME PAGE
Description: MODIS Characterization Support Team (MCST)


Link: VIEW PROJECT HOME PAGE
Description: MODIS Science Team


Link: VIEW PROJECT HOME PAGE
Description: MODIS Atmosphere Team


Link: VIEW RELATED INFORMATION
Description: Readme regarding accessing MODIS data from the LAADS FTP server.


Link: VIEW RELATED INFORMATION
Description: View MODIS data availability.


Link: VIEW RELATED INFORMATION
Description: MODIS Characterization Support Team (MCST), Level 1B Product Information and
Status Page


Geographic Coverage
 N: 90.0 S: -90.0  E: 180.0  W: -180.0

Data Set Citation
Dataset Originator/Creator: MCST Team
Dataset Title: MODIS/Terra Calibrated Radiances 5-Min L1B Swath 250m
Version: Collection 004 and 005
Issue Identification: MOD02QKM
Online Resource: http://modis.gsfc.nasa.gov/data/dataprod/dataproducts.php?MOD_NUMBE...


Temporal Coverage
Start Date: 2000-03-01


Location Keywords
OCEAN > ATLANTIC OCEAN
OCEAN > INDIAN OCEAN
OCEAN > PACIFIC OCEAN
GEOGRAPHIC REGION > GLOBAL
GEOGRAPHIC REGION > GLOBAL LAND
GEOGRAPHIC REGION > GLOBAL OCEAN


Data Resolution
Latitude Resolution: 250 m
Longitude Resolution: 250 m
Temporal Resolution: Two day repeat observations with a repeat orbit pattern every 16 days.


Science Keywords
SPECTRAL/ENGINEERING >INFRARED WAVELENGTHS >INFRARED RADIANCE    [Definition]
SPECTRAL/ENGINEERING >INFRARED WAVELENGTHS >REFLECTED INFRARED    [Definition]
SPECTRAL/ENGINEERING >VISIBLE WAVELENGTHS >VISIBLE RADIANCE    [Definition]


ISO Topic Category
IMAGERY/BASE MAPS/EARTH COVER


Platform
TERRA >Earth Observing System, TERRA (AM-1)    [Information]


Instrument
MODIS >Moderate-Resolution Imaging Spectroradiometer    [Information]


Project
DODS >Distributed Oceanographic Data System    [Information]
EOSDIS >Earth Observing System Data Information System    [Information]
ESIP >Earth Science Information Partners Program    [Information]
TERRA >Earth Observing System (EOS), TERRA    [Information]
OPENDAP >Open-source Project for a Network Data Access Protocol    [Information]


Keywords
BRDF
CALIBRATED
GEOLOCATED
NIR
RADIANCE
SWIR
VISIBLE
EOSDIS
NRT
LANCE


Data Set Progress
IN WORK


Data Center
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    [Information]
Data Center URL: http://ladsweb.nascom.nasa.gov/
Dataset ID: MOD02QKM Collection 5

Data Center Personnel
Name: LAADS USER SUPPORT TEAM
Phone: 301-731-2917, 1-866-506-6347 (toll-free - US only)
Fax: 301-577-6622
Email: modapsuso at sigmaspace.com
Contact Address:
LAADS User Support Team
4801 Forbes Boulevard
City: Lanham
Province or State: MD
Postal Code: 20706
Country: USA


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    [Information]
Data Center URL: http://modaps.nascom.nasa.gov
Dataset ID: MOD02QKM Collection 4

Data Center Personnel
Name: MODAPS OPERATION TEAM
Phone: 301-731-2917, 1-866-506-6347 (toll-free - US only)
Email: opsdist at sigmaspace.com



Distribution
Distribution_Media: Online (FTP)
Distribution_Format: HDF
Fees: No Fee


Personnel
GANG YE, PH.D
Role: DIF AUTHOR
Phone: 301-352-2109
Email: gang.ye at sigmaspace.com


LAADS USER SUPPORT TEAM
Role: TECHNICAL CONTACT
Phone: 301-731-2917, 1-866-506-6347 (toll-free - US only)
Fax: 301-577-6622
Email: modapsuso at sigmaspace.com
Contact Address:
LAADS User Support Team
4801 Forbes Boulevard
City: Lanham
Province or State: MD
Postal Code: 20706
Country: USA


GES DISC HELP DESK SUPPORT GROUP
Role: TECHNICAL CONTACT
Phone: 301-614-5224
Fax: 301-614-5268
Email: gsfc-help-disc at lists.nasa.gov
Contact Address:
Goddard Earth Sciences Data and Information Services Center
Code 610.2
NASA Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA



Creation and Review Dates
DIF Creation Date: 2007-05-04
Last DIF Revision Date: 2013-06-10


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