MODIS/Aqua Clouds 5-Min L2 Swath 1km and 5km (Collection 004 and 005)
Entry ID:
MYD06_L2
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Summary
Abstract:
MODIS was launched aboard the Aqua satellite on May 04, 2002 (1:30 pm 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 MYD06_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 (MYD06_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 MYD06_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. MYD06_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. For browsing and extracting data from these files, some software are made available at the site. MYD06_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.
Related URL
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Description:
Access Collection 5 data set MYD06_L2 from the LAADS FTP server.
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Geographic Coverage
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Spatial coordinates
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N: 90.0
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S: -90.0
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E: 180.0
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W: -180.0
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Data Set Citation
Dataset Originator/Creator:
Menzel P., King M., Gao B.
Dataset Title:
MODIS/Aqua Clouds 5-Min L2 Swath 1km and 5km Collection 004 and 005
Version:
Collection 004 and 005
Online Resource:
http://modis-atmos.gsfc.nasa.gov/MOD06_L2/
Data Resolution
Latitude Resolution:
5 km
Longitude Resolution:
5 km
Horizontal Resolution Range:
1 km - < 10 km or approximately .01 degree - < .09 degree
Temporal Resolution:
5-minute
Temporal Resolution Range:
1 minute - < 1 hour
Access Constraints
Available to public to gain familiarity with the data format and parameters.
Distribution
Distribution Media:
FTP
Distribution Size:
15 GB
Distribution Format:
HDF
Fees:
None
Personnel
Role:
DIF AUTHOR
Phone:
301-352-2109
Email:
gang.ye at sigmaspace.com
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
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
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.
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date:
2003-04-22
Last DIF Revision Date:
2011-05-09
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