MODIS/Terra Cloud Mask and Spectral Test Results 5-Min L2 Swath 250m and 1km (Collection 004 and 005)
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 MODIS level-2 cloud mask product is a global product generated for
both daytime & nighttime conditions at 1-km spatial resolution (at
nadir) and for daytime at 250-m resolution. The algorithm employs a
series of visible and infrared threshold and consistency tests to
specify confidence levels that an unobstructed view of the Earth's
surface is observed. An indication of shadows affecting the scene is
also provided. The 250-m cloud mask flags are based on the visible
channel data only. Radiometrically accurate radiances are required, so
holes in the cloud mask will appear wherever the input radiances are
incomplete or of poor quality. The shortname for this Level-2 MODIS
cloud mask product is MOD35_L2 and the principal investigator for this
product is MODIS scientist Dr. Paul Menzel ( email@example.com).
MOD35_L2 product files are stored in Hierarchical Data Format
(HDF-EOS). Each of the 9 gridded parameters is stored as a Scientific
Data Set (SDS) within the HDF-EOS file. The Cloud Mask and Quality
Assurance SDS's are stored at 1 kilometer pixel resolution. All other
SDS's (those relating to time, geolocation, and viewing geometry) are
stored at 5 kilometer pixel resolution. Each file is roughly 47.5 MB
in size, and the total data volume is approximately 13.7 GB/day.
MOD35_L2 Data Group & Parameters
Spatial & Temporal Resolution:
Latitude & Longitude
Scan start time
Solar and Sensor Viewing Geometry:
Solar zenith & Solar azimuth angle
Sensor zenith & Sensor azimuth angle
Cloud Mask (1km)
Cloud Mask (250 m)
Quality Assurance Parameters:
Quality Assurance Flags (1km)
Link to the MODIS homepage for more data set information:
Web site for MODIS Collection 5 L1B, Geo and atmosphere data ordering.
Web site for MODIS Collection 4 atmosphere data ordering.
Data Set Citation
Menzel, W. P
MODIS/Terra Cloud Mask and Spectral Test Results 5-Min L2 Swath 250m and 1km
Collection 004 and 005
Horizontal Resolution Range:
1 km - < 10 km or approximately .01 degree - < .09 degree
Temporal Resolution Range:
1 minute - < 1 hour
The 'version 003' or 'collection 003' product is better than 'version
001' or 'beta' product. The quality of this version 003 product is
... established as 'Provisional' since it is based on better calibration
algorithm but the product is not fully validated yet.
Available to public to gain familiarity with the data format and parameters.
This Data set (version 003/collection 003) 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
Data Set Progress
gang.ye at sigmaspace.com
paulm at ssec.wisc.edu
Space Science and Engineering Center
University of Wisconsin-Madison
1225 W. Dayton St.
Province or State:
301-731-2917, 1-866-506-6347 (toll-free - US only)
modapsuso at sigmaspace.com
LAADS User Support Team
4801 Forbes Boulevard
Province or State:
Ackerman,S. , K. Strabala, P. Menzel, R. Frey, C. Moeller, L. Gumley,
B. Baum, C. Schaaf, and G. Riggs,1998: Discriminating Clear Sky from
Clouds (Cloud Mask Retrieval Algorithm) Theoretical Basis
Document. ATBD-MOD-06, NASA Goddard Space Flight Center, 32 pp. ... 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., 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, P. Menzel, D. Tanre, and B.Gao, 1999: MODIS
Atmosphere Validation Plan, NASA Goddard Space Flight Center, 48 pp.
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.
Menzel, W. P.,and L. E. Gumley, 1997:MODIS Cloud Mask , in MTPE EOS
Data Products Handbook, pp. 112-113.
Rossow, W. B., and L.C. Gardner, 1993: Cloud detection using satellite
measurements of infrared and visible radiances for ISCCP, J. Climate,
Extended Metadata Properties
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Creation and Review Dates
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