MODIS/Terra Level 1B Subsampled Calibrated Radiance 5Km (MOD02SSH, Collection 004 and 005)
Entry ID: MOD02SSH

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Summary
Abstract: This data type (MOD02SSH) is a subsample from the MODIS Level 1B 1-km data.
Every fifth pixel is taken from the MOD021KM product and written out to
MOD02SSH. The subsampling starts at the third frame, and at the third line.
Here, "frame" and "line" are naming conventions for pixels along and across the
scan, respectively. Since MOD02SSH is a subsampled Level 1B , many things from
the Level 1B documentation apply as well. That is, the MOD02SSH data product
contains calibrated and geolocated at-aperture radiances for 36 bands generated
from MODIS Level 1A scans of raw radiance (MOD 01). The radiance units are in
W/(m ^2 um sr). Additional data are provided including quality flags, error
estimates and calibration data. Visible, shortwave infrared (SWIR), and Near
Infrared (NIR) measurements are made during daytime only, while radiances for
Thermal Infrared (TIR) are measured continuously.

As it's parent, the MOD02SSH is in HDF-EOS format, and all metadata structures
and names are preserved for better convenience. However, some relevant changes
are made where appropriate. E.g. the dimension mappings are updated to reflect
the new one-to-one correspondance between the data and geolocations. The latter
is one of the most important differences: in the MOD02SSH, there is no offset
between data and geolocation pixels. The spatial coverage is almost similar to
that from MOD021KM (nominally it is 2330 by 2030 km, cross-track by
along-track, respectively). The MOD02SSH is produced continuously, and thus the
processing provides 2-day repeat observations of the Earth with a repeat orbit
pattern every 16 days.

(The shortname for this product is MOD02SSH)

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.

See the homepage for more data set
information: http://modis.gsfc.nasa.gov/data/dataprod/

Related URL
Link: GET DATA > LAADS
Description: Access Collection 5 dataset MOD02SSH from the LAADS FTP server.


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 > 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), Level 1B Product
Information and Status Page


Link: VIEW PROJECT HOME PAGE
Description: MODIS Science 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.


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 Level 1B Subsampled Calibrated Radiance 5Km (MOD02SSH)
Version: Collection 005
Issue Identification: MOD02SSH
Online Resource: http://modis.gsfc.nasa.gov/data/dataprod/


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: 5 km at nadir
Longitude Resolution: 5 km at nadir
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 >INFRARED WAVELENGTHS >THERMAL 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
TIR
VISIBLE
EOSDIS


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: MOD02SSH Collection 005

Data Center Personnel
Name: LAADS USER SUPPORT TEAM
Phone: 1-800-596-8132
Fax: 301-867-2151
Email: MODAPSUSO at lists.nasa.gov
Contact Address:
LAADS User Support Team
NASA/GSFC
Mail Code: 619
City: Greenbelt
Province or State: MD
Postal Code: 20771
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: MOD02SSH Collection 004

Data Center Personnel
Name: MODAPS OPERATION TEAM
Phone: 1-800-596-8132
Email: modis-ops at lists.nasa.gov



Distribution
Distribution_Format: HDF


Personnel
GANG YE, PH.D
Role: DIF AUTHOR
Phone: 301-867-2089
Email: gang.ye-1 at nasa.gov


LAADS USER SUPPORT TEAM
Role: TECHNICAL CONTACT
Phone: 1-800-596-8132
Fax: 301-867-2151
Email: MODAPSUSO at lists.nasa.gov
Contact Address:
LAADS User Support Team
NASA/GSFC
Mail Code: 619
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA



Creation and Review Dates
DIF Creation Date: 2006-09-05
Last DIF Revision Date: 2013-06-10

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