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MODIS/Aqua Cld Mask Spect. Test Results 5-Min L2 Swath Subset along MLS V2 (MAM35S0) at GES DISC

Entry ID: GES_DISC_MAM35S0_v2

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Summary

Abstract: This is the MODIS/Aqua subset along MLS field of view track. The goal of the subset is to select and return MODIS data that are within +-100 km across the MLS track. I.e. the resultant MODIS subset swath is sought to be about 200 km cross-track. Geolocations in the original product, however, are subsampled at 5-km, and thus the crosss-track width of the subset geolocations is 41 pixels. The ... subset Cloud Mask has 201 pixels across-track. However, some of the Cloud Mask information is at bit level, thus allowing storing actually 250-m information in seemingly 1-km pixels. This is achieved by reserving 2 bytes (the last two out of six) of every 1-km pixel as 16 yes/no-cloud bits. Each one of these 16 bits flags a corresponding 250-m tile inside the 1-km pixel. Their state is described in the local attributes to the Cloud_Mask HDF data set, and accordingly must be interprated as 0=YES, 1=NO. Thus the effective cross-track width, for these two bytes only, is 804 tiles of 250-m denomination.

Along-track, all MODIS pixels from the original product are preserved.

In the standard product, 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 MYD35_L2 and the principal investigator for this product is MODIS scientist Dr. Paul Menzel (paulm@ssec.wisc.edu).

Temporal_Resolution:
"Two day repeat observations with a repeat orbit pattern every 16 days. The
locales where the ascending and descending modes are close or intersect can
have two observations per day."

(The shortname for this product is MAM35S0).
For more data set information:
A-Train Data Depot homepage: http://disc.sci.gsfc.nasa.gov/atdd/
MODIS Science Team homepage: http://modis.gsfc.nasa.gov/data/dataprod/
MODIS-Atmosphere homepage: http://modis-atmos.gsfc.nasa.gov/

Related URL

Link: GET DATA

Description: View MODIS CloudSat Subsetted data availability for "MODIS/Aqua Cld Mask Spect. Test Results 5-Min L2 Swath Subset along MLS".

Geographic Coverage

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Spatial coordinates

N: 90.0

S: -90.0

E: 180.0

W: -180.0

Data Set Citation

Dataset Originator/Creator: GES DISC/MODIS

Dataset Title: MODIS/Aqua Cld Mask Spect. Test Results 5-Min L2 Swath Subset along MLS

Dataset Release Date: October 2006

Dataset Release Place: Greenbelt, MD, USA

Dataset Publisher: Goddard Earth Science Data and Information Services Center (GES DISC)

Version: 2

Issue Identification: MAM35S0_2

Data Presentation Form: Digital Science Data

Online Resource: http://disc.sci.gsfc.nasa.gov/atdd/data_products.shtml

Temporal Coverage

Start Date: 2000-03-01

Location Keywords

OCEAN > ATLANTIC OCEAN

OCEAN > INDIAN OCEAN

Data Resolution

Latitude Resolution: 1 km at nadir
Longitude Resolution: 1 km at nadir
Horizontal Resolution Range: 1 km - < 10 km or approximately .01 degree - < .09 degree
Temporal Resolution: Two day repeat observations with a repeat orbit pattern every 16 days.
Temporal Resolution Range: Daily - < Weekly

Science Keywords

ATMOSPHERE > CLOUDS > CLOUD PROPERTIES > CLOUD FREQUENCY

ATMOSPHERE > CLOUDS > CLOUD PROPERTIES > CLOUD TOP PRESSURE

ATMOSPHERE > CLOUDS > CLOUD PROPERTIES > CLOUD BASE PRESSURE

ISO Topic Category

CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

Platform

AQUA > Earth Observing System, AQUA

Instrument

MODIS > Moderate-Resolution Imaging Spectroradiometer

Project

ACRP > Archive of Census Related Products

EOSDIS > Earth Observing System Data Information System

ESIP > Earth Science Information Partners Program

Quality The boundary data are derived from the 1992 version of the U.S. Census Bureau's
Topologically Integrated Geographic Encoding and Referencing (TIGER) system.
The 1992 TIGER files include boundaries for the 1980 and 1990 censuses.

Access Constraints None

Use Constraints The Trustees of Columbia University in the City of New York hold the copyright
of this dataset. Users are prohibited from any commercial, non-free resale, or
redistribution without explicit ...

Ancillary Keywords

CIESIN > Environmental Protection > Land Use > Zoning

Census

Data Set Progress

COMPLETE

Originating Center

SEDAC

Data Center

Socioeconomic Data and Applications Center

Data Center URL: http://sedac.ciesin.columbia.edu/
Dataset ID: CIESIN_SEDAC_ACRP_1990_SI

Data Center Personnel
Name: SEDAC USER SERVICES Phone: +1 845-365-8920 Fax: +1 845-365-8922 Email: ciesin.info at ciesin.columbia.edu Contact Address: 61 Route 9W, P.O. Box 1000 City: Palisades Province or State: NY Postal Code: 10964 Country: USA

Distribution

Distribution Media: Online FTP

Distribution Format: CSV

Fees: 0

Personnel

SEDAC USER SERVICES

Role: TECHNICAL CONTACT

Phone: +1 845-365-8920

Fax: +1 845-365-8922

Email: ciesin.info at ciesin.columbia.edu

Contact Address:

61 Route 9W, P.O. Box 1000

City: Palisades

Province or State: NY

Postal Code: 10964

Country: USA

CIESIN METADATA ADMINISTRATION

Role: DIF AUTHOR

Phone: +1 845-365-8988

Fax: +1 845-365-8922

Email: metadata at ciesin.columbia.edu

Contact Address:

61 Route 9W, P.O. Box 1000

City: Palisades

Province or State: New York

Postal Code: 10964

Country: USA

Publications/References

Center for International Earth Science Information Network (CIESIN) (1996), Archive of Census Related Products (ACRP): 1980 SAS Transport Files, NASA Socioeconomic Data and Applications Center (SEDAC), Saginaw, MI, http://sedac.ciesin.columbia.edu/data/set/acrp-sas-transport-1980

Extended Metadata Properties

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Creation and Review Dates

DIF Creation Date: 1995-06-21

Last DIF Revision Date: 2012-09-28

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