MODIS/Terra Cloud Mask and Spectral Test Results 5-Min L2 Swath 250m and 1km (Collection 004 and 005)Entry ID: MOD35_L2
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 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:
(Click for Interactive Map)
Data Set Citation
Dataset Originator/Creator: Menzel, W. P
Dataset Title: MODIS/Terra Cloud Mask and Spectral Test Results 5-Min L2 Swath 250m and 1km
Version: Collection 004 and 005Online Resource: http://modis-atmos.gsfc.nasa.gov/MOD35_L2/
Start Date: 2001-03-06
Latitude Resolution: 250 m
Longitude Resolution: 250 m
Horizontal Resolution Range: 1 km - < 10 km or approximately .01 degree - < .09 degree
Temporal Resolution: 5-minute
Temporal Resolution Range: 1 minute - < 1 hour
ISO Topic Category
Quality 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.
Access Constraints Available to public to gain familiarity with the data format and parameters.
Use Constraints 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
Distribution Media: Online (FTP)
Distribution Size: 15 GB
Distribution Format: HDF
Role: DIF AUTHOR
Email: gang.ye-1 at nasa.gov
Email: paulm at ssec.wisc.edu
NOAA/NESDIS Space Science and Engineering Center University of Wisconsin-Madison 1225 W. Dayton St.
Province or State: WI
Postal Code: 53706
Role: TECHNICAL CONTACT
Email: MODAPSUSO at lists.nasa.gov
LAADS User Support Team NASA/GSFC Mail Code: 619
Province or State: MD
Postal Code: 20771
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
(Click to view more)
Creation and Review Dates
DIF Creation Date: 2001-06-21
Last DIF Revision Date: 2013-06-10
Future DIF Review Date: 2001-08-15