MODIS/Terra Clouds 5-Min L2 Swath 1km and 5km (Collection 004 and 005)
Entry ID: MOD06_L2

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Summary
Abstract: MODIS was launched aboard the Terra satellite on December 18, 1999
(10:30 am equator crossing time) as part of NASA's Earth Observing
System (EOS) mission. MODIS with its 2330 km viewing swath width
provides almost daily global coverage. It acquires data in 36 high
spectral resolution bands between 0.415 to 14.235 micron with spatial
resolutions of 250m(2 bands), 500m(5 bands), and 1000m (29
bands). MODIS sensor counts, calibrated radiances, geolocation
products and all derived geophysical atmospheric and ocean products
are archived at NASA Goddard DAAC and has been made available to
public since April 2000.

The level-2 MODIS cloud product consists of cloud optical and physical
parameters. These parameters are derived using remotely sensed
infrared, visible and near infrared solar reflected radiances. MODIS
infrared channel radiances are used to derive cloud top temperature,
cloud top height, effective emissivity, cloud phase (ice vs. water,
opaque vs. non-opaque), and cloud fraction under both daytime and
nighttime conditions. MODIS visible radiances are used to derive cloud
optical thickness and effective particle radius and cloud shadow
effects. Near infrared solar reflected radiance provides additional
information in the retrieval of cloud particle phase (ice vs. water,
clouds vs. snow). The shortname for this level-2 MODIS cloud product
is MOD06_L2 and the principal investigators for this product are MODIS
scientists Dr. Bo-Cai Gao ( gao@rsd.nrl.navy.mil) for cirrus cloud
detection; Dr. Paul Menzel ( paulm@ssec.wisc.edu) for cloud top
properties; and Dr. Michael King( king@climate.gsfc.nasa.gov) for
cloud optical properties .

The level-2 cloud product (MOD06_L2) consists of 46 gridded cloud
parameters. These parameters are produced at a spatial resolution of
either 1- km or 5-km (at nadir). Each MOD06_L2 product file covers a
five-minute time interval. This means that for 5-km resolution
parameters, the output grid is 270 pixels in width by 406 pixels in
length. Every tenth granule has an output grid size of 270 by 408
pixels. For 1-km resolution parameters, the output grid is 1354 pixels
in width by 2030 pixels in length and every tenth granule has an
output grid size of 1354 by 2040 pixels.


MOD06_L2 product files are stored in Hierarchical Data Format
(HDF-EOS). Forty four of the 46 gridded cloud parameters are stored as
Scientific Data Sets (SDS) within the file, the remaining two (band
number and statistics) are stored as Vdata(table
arrays). Approximately 288 files are produced daily. Nighttime files
are smaller than their daytime counterparts since only cloud top
properties are retrieved at night. Each daytime file is roughly 65.1
MB in size and each nighttime HDF file roughly 12.4 MB in size, and
the total data volume is approximately 12.3 GB/day.

MOD06_L2 Data Category & Parameters

Spatial & Temporal Resolution:
latitude,longitude
scan start time

Solar and Sensor Viewing Geometry:
solar zenith angle, solar azimuth angle
sensor zenith angle, sensor azimuth angle

Cloud Top Parameters (5km):

cloud top pressure from IR retriev(daytime,nighttime,all)
cloud top pressures from individual thermal band ratios
cloud height retrieval method, tropopause height
surface pressure

cloud top temperature (daytime,nighttime,all)
cloud effective emissivity (daytime,nighttime,all)
cloud fraction (daytime,nighttime,all)
cloud phase(daytime, nighttime, all)


Cloud Optical Properties (1km):
cloud optical thickness
cloud water path
effective particle radius
effective particle radius difference

Radiation Parameters:
spectral cloud forcing
cirrus reflectance
surface type (emissivity based)
Brightness Temperature
Brightness Temperature Difference

Quality Assurance Parameters:
Processing flag for 5 km resolution
cirrus reflectance flag for 1 km resolution
quality assurance flag for 1 & 5 km resolution
cloud mask for 1 & 5 km, radiance variance for thermal bands
statistics for parameters at 1km resolution


The MODIS Cloud Product will be used to investigate seasonal and
inter-annual changes in cirrus (semi-transparent) global cloud cover
and cloud phase with multispectral observations at high spatial (1
kilometer) resolution.

For more information about the MOD06_L2 product, visit the
MODIS-Atmosphere site at:
http://modis-atmos.gsfc.nasa.gov/MOD06_L2/
or
See the MODIS Science Team homepage for more data set
information at: 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 MOD06_L2 via the LAADS FTP server.


Link: GET DATA > LAADS
Description: Access Collection 4 data set MOD06_L2 via the LAADS FTP server.


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


Link: VIEW PROJECT HOME PAGE
Description: MODIS Science Team


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


Link: VIEW PROJECT HOME PAGE
Description: MODIS Atmosphere Team


Link: VIEW RELATED INFORMATION
Description: Data set description.


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: Sample and Browse Images for MODIS (MOD06_L2) Aerosol Products


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

Data Set Citation
Dataset Originator/Creator: MODIS Atmosphere Team
Dataset Title: MODIS/Terra Clouds 5-Min L2 Swath 1km and 5km
Version: Collection 004 and 005
Online Resource: http://modis-atmos.gsfc.nasa.gov/MOD06_L2/


Temporal Coverage
Start Date: 2001-03-06


Location Keywords
GEOGRAPHIC REGION > ARCTIC
GEOGRAPHIC REGION > GLOBAL
GEOGRAPHIC REGION > POLAR


Data Resolution
Latitude Resolution: 5 km
Longitude Resolution: 5 km
Temporal Resolution: 5-minute


Science Keywords
ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD FREQUENCY    [Definition]
ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD ASYMMETRY    [Definition]
ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD CEILING    [Definition]
ATMOSPHERE >CLOUDS >CLOUD MICROPHYSICS >CLOUD CONDENSATION NUCLEI    [Definition]
ATMOSPHERE >CLOUDS >CLOUD RADIATIVE TRANSFER >CLOUD EMISSIVITY    [Definition]
ATMOSPHERE >CLOUDS >CLOUD RADIATIVE TRANSFER >CLOUD RADIATIVE FORCING    [Definition]
ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD HEIGHT    [Definition]
ATMOSPHERE >CLOUDS >CLOUD MICROPHYSICS >CLOUD LIQUID WATER/ICE    [Definition]
ATMOSPHERE >CLOUDS >CLOUD MICROPHYSICS >CLOUD OPTICAL DEPTH/THICKNESS    [Definition]
ATMOSPHERE >CLOUDS >CLOUD MICROPHYSICS >CLOUD PRECIPITABLE WATER    [Definition]
ATMOSPHERE >CLOUDS >CLOUD RADIATIVE TRANSFER >CLOUD REFLECTANCE    [Definition]
ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD TOP PRESSURE    [Definition]
ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD TOP TEMPERATURE    [Definition]
ATMOSPHERE >CLOUDS >CLOUD TYPES    [Definition]
ATMOSPHERE >CLOUDS >CLOUD PROPERTIES >CLOUD VERTICAL DISTRIBUTION    [Definition]
ATMOSPHERE >CLOUDS >CLOUD MICROPHYSICS >CLOUD DROPLET CONCENTRATION/SIZE    [Definition]
ATMOSPHERE >CLOUDS    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >ATMOSPHERIC EMITTED RADIATION    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >EMISSIVITY    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >OPTICAL DEPTH/THICKNESS    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >RADIATIVE FLUX    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >REFLECTANCE    [Definition]
ATMOSPHERE >ATMOSPHERIC RADIATION >TRANSMITTANCE    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


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]


Quality
The 'version 004' or 'collection 004' product is better than 'version
003' and earlier versions. The quality of this version 004 product is
established as 'Provisional' . It is based on a better calibration
algorithm but the product is not fully validated yet. Product images
look reasonable when compared to other spaceborne instruments
or comparable data in limited situations. Scientific use should be
performed with caution with careful reference to QA statements
provided with each product.For the latest information please see:
http://modis-atmos.gsfc.nasa.gov/products_calendar_overview.html.


Access Constraints
Available to public to gain familiarity with the data format and parameters.


Use Constraints
This Data set (version 004/collection 004) is of 'Provisional'
Quality. Even though, it is based on better calibration algorithm but
is not fully validated yet. This data is still not appropriate for use
in scientific publications. Before using it in any publication please
contact science team representative for the known problems and
updates.


Keywords
BRIGHTNESS TEMPERATURE
CIRRUS REFLECTANCE
CLOUD ALTITUDE
CLOUD CLIMATOLOGY
CLOUD EFFECTIVE RADIUS
CLOUD EXTENT
CLOUD FRACTION
CLOUD LIQUID WATER PATH
CLOUD MICROPHYSICS
CLOUD OPTICAL DEPTH
CLOUD OPTICAL PROPERTIES
CLOUD PHASE
CLOUD TOP HEIGHT
CLOUD TOP TEMPERATURE
CLOUD TYPE
CLOUD WATER PATH
CONTRAIL
CONTRAIL REFLECTANCE
DROPLET SIZE
EFFECTIVE EMISSIVITY
GLOBAL CHANGE
HIGH CLOUD
ICE CLOUD
LOW CLOUD
MOD06
MOD06_L2
MODIS CLOUD PRODUCTS
SPECTRAL CLOUD FORCING
THICK CLOUD
THIN CLOUD
WATER CLOUD
EOSDIS
Near Real Time (NRT)
LANCE


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: MOD06_L2 Collection 004 and 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



Distribution
Distribution_Media: Online (FTP)
Distribution_Size: 15 GB
Distribution_Format: HDF
Fees: None


Personnel
GANG YE, PH.D
Role: DIF AUTHOR
Phone: 301-352-2109
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


BO_CAI,DR. GAO
Role: INVESTIGATOR
Phone: 202-767-8252
Fax: 202-404-8894
Email: gao at rsd.nrl.navy.mil
Contact Address:
Naval Research Laboratory
Remote Sensing Division, Code 7212
4555 Overlook Ave., SW
City: Washington
Province or State: DC
Postal Code: 20375-5320
Country: USA


DR. MICHAEL D. KING
Role: INVESTIGATOR
Phone: 301-614-5636
Fax: 301-614-5620
Email: michael.d.king at nasa.gov
Contact Address:
NASA
Goddard Space Flight Center
Mailstop 610.0
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


PAUL, DR. MENZEL
Role: INVESTIGATOR
Phone: 608-264-5325
Fax: 608-262-5974
Email: paulm at ssec.wisc.edu
Contact Address:
NOAA/NESDIS
Space Science and Engineering Center
University of Wisconsin-Madison
1225 W. Dayton St.
City: Madison
Province or State: WI
Postal Code: 53706
Country: USA


Publications/References
Ackerman, S. A., W. L. Smith and H. E. Revercomb, 1990: The 27-28
October 1986 FIRE IFO cirrus case study: spectral properties of cirrus
clouds in the 8-12 micron window. Mon. Wea. Rev., 118, 2377-2388.

Ackerman, S. K. Strabala, P.Menzel, R. Frey, C. Moeller, and
L. Gumley, 1998: Discriminating clear sky from clouds with
MODIS. J. Geophys. Res., 103, 32141-32157

Chu, A., K. Strabala, S. Platnick, E. Moody,M. King, S. Mattoo,
R. Hucek, and B. Ridgway, 2000: MODIS Atmosphere QA Plan. Version 2.2
,NASA Goddard Space Flight Center, 46 pp.

Gao, B.-C., Y. J. Kaufman, W. Han, and W. J. Wiscombe, 1998:
Correction of thin cirrus path radiance in the 0.4 - 1.0 ?m
spectral region using the sensitive 1.375-m cirrus detecting
channel, J.Geophys. Res., 103, 32169-32176.

Gao, B.-C., W. Han, S.-C. Tsay, and N. F. Larsen, 1998: Cloud
detection over arctic region using airborne imaging spectrometer data
during the daytime,J. Appl. Meteorol., 37, 1421-1429.

Gao, B.-C., and Y. J. Kaufman, 1995: Selection of the 1.375-?m
MODIS channel for remote sensing of cirrus clouds and stratospheric
aerosols from space, J. Atm. Sci., 52, 4231-4237.

Gao, B. -C, A. F. H. Goetz, and W. J. Wiscombe, 1993: Cirrus detection
from Airborne Imaging Radiometer using 1.38 micron water vapor
band. Geophys. Res. Letter, 4,301-304.

King, M., Y. Kaufman, W. P. Menzel, D. Tanre, B. Gao, 1999: MODIS
Atmosphere Validation Plan, NASA Goddard Space Flight Center, 48 pp.


King, M. D., S. C. Tsay, S. E. Platnick, M. Wang, and K. Liou, 1997:
Cloud Retrieval Algorithms for MODIS: Optical Thickness, Effective
Particle Radius, and Thermodynamic Phase ,Algorithm Theoretical Basis
Document, ATBD-MOD-05, NASA Goddard Space Flight Center,

King, M. D., W. P. Menzel, P. S. Grant, J. S. Myers, G. T. Arnold,
S. E. Platnick, L. E.Gumley, S. C. Tsay, C. C. Moeller, M. Fitzgerald,
K. S. Brown and F. G.Osterwisch, 1996: Airborne scanning spectrometer
for remote sensing of cloud, aerosol, water vapor and surface
properties. J. Atmos. Oceanic Technol.,13, 777–794.

King, M. D., Y. J. Kaufman, W. P. Menzel and D. Tanr?, 1992: Remote
sensing of cloud, aerosol and water vapor properties from the Moderate
Resolution Imaging Spectrometer (MODIS). IEEE Trans. Geosci. Remote
Sens., 30, 2–27.

King, M. D., 1987: Determination of the scaled optical thickness of
clouds from re-flected solar radiation measurements. J. Atmos. Sci.,
44, 1734–1751.

King, M. D., M. G. Strange, P. Leone and L. R. Blaine, 1986:
Multiwavelength scanningradiometer for airborne measurements of
scattered radiation within clouds. J. Atmos. Oceanic Technol., 3,
513–522.

King, M. D., 1981: A method for determining the single scattering
albedo of clouds through observation of the internal scattered
radiation field. J. Atmos.Sci., 38, 2031–204.

Menzel, P., and M. King, 1997:MODIS Cloud Product, in MTPE EOS Data
Products Handbook,109-111.

Menzel, P., and K. Strabela. 1997: Cloud Top Properties and Cloud
Phase,Algorithm Theoretical Basis Document.ATBD-MOD-04, NASA Goddard
Space Flight Center,56 pp.

Menzel, W. P. and K. I. Strabala, 1989: Preliminary report on the
demonstration of the VAS CO2 cloud parameters (cover, height, and
amount) in support of the Automated Surface Observing System
(ASOS). NOAA Tech Memo NESDIS 29.

Nakajima, T., M. D. King , J. D. Spinhirne and L. F. Radke, 1991:
Determination of the optical thickness and effective particle radius
of clouds from reflected solar radiation measurements. Part II: Marine
stratocumulus observations. J. Atmos. Sci., 48, 728–750.

Nakajima, T., and M. D. King, 1990: Determination of the optical
thickness and effective particle radius of clouds from reflected solar
radiation measurements. Part I: Theory. J. Atmos. Sci., 47,
1878–1893.

Rossow, W. B., and L.C. Gardner, 1993: Cloud detection using satellite
measurements of infrared and visible radiances for ISCCP, J. Climate,
6, 2341-2369.

Strabala, K. I., S. A. Ackerman and W. P. Menzel, 1994: Cloud
properties inferred from 8-12 micron data. J. Appl. Meteor, 33, No. 2,
212-229.

Creation and Review Dates
DIF Creation Date: 2003-04-03
Last DIF Revision Date: 2013-06-10

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