Global Change Master Directory (GCMD)

Data Sets

Services / Tools

Ancillary Descriptions

Are you using a browser that doesn't support JavaScript or have you disabled JavaScript?

If you have disabled JavaScript, you must re-enable JavaScript to use this page.
Or you can view this record using the Text Only Format.

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

[ Get Data ]
[ Update this Record ]

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

(Click for Interactive Map)

Spatial coordinates

N: 90.0

S: -90.0

E: 180.0

W: -180.0

Temporal Coverage

Start Date: 1997-09-01

Location Keywords

OCEAN > ARCTIC OCEAN

OCEAN > ATLANTIC OCEAN

Data Resolution

Latitude Resolution: 4 km
Longitude Resolution: 4 km
Horizontal Resolution Range: 1 km - < 10 km or approximately .01 degree - < .09 degree
Temporal Resolution Range: Hourly - < Daily

Science Keywords

ATMOSPHERE > AEROSOLS > AEROSOL BACKSCATTER > AEROSOL REFLECTANCE

ATMOSPHERE > AEROSOLS > AEROSOL EXTINCTION

ISO Topic Category

CLIMATOLOGY/METEOROLOGY/ATMOSPHERE

GEOSCIENTIFIC INFORMATION

OCEANS

Platform

SEASTAR > Orbital Sciences Corporation OrbView-2 Satellite

Instrument

SEAWIFS > Sea-Viewing Wide Field-of-View Sensor

Project

EOS > Earth Observing System

EOSDIS > Earth Observing System Data Information System

ESIP > Earth Science Information Partners Program

SEAWIFS > Sea-viewing Wide Field-of-view Sensor

Access Constraints From the start of instrument operations through January 1, 1998, all SeaWiFS
data is free and available to the public. Following January 1, 1998, SeaWiFS
data for scientific research will ONLY be available to Authorized Users who
have registered with the SeaWiFS Project. Any individual scientist who will be
conducting research that employs SeaWiFS data must be a registered Authorized
User. A single Authorized User cannot obtain data to be used anonymously by
members of a research group; all of the members of the group must be Authorized
Users.

Use Constraints Publications of research results utilizing these data must acknowledge the
SeaWiFS Project and the Ocean Biology Processing Group (OBPG) at the NASA
Goddard Space Flight Center, Greenbelt, MD, USA.

Data Set Progress

IN WORK

Originating Center

OBPG

Data Center

Ocean Biology Processing Group (OBPG), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA

Data Center URL: http://oceancolor.gsfc.nasa.gov/
Dataset ID: SeaWiFS Level 2 GAC
Dataset ID: SeaWiFS Level 2 LAC
Dataset ID: SeaWiFS Level 2 MLAC

Data Center Personnel
Name: GENE CARL FELDMAN Phone: (301) 286-9428 Fax: (301) 286-0268 Email: gene.c.feldman at nasa.gov Contact Address: Data System Manager NASA/Goddard Space Flight Center Mailstop 614.8 City: Greenbelt Province or State: MD Postal Code: 20771 Country: USA

Distribution

Distribution Media: FTP

Distribution Format: HDF

Personnel

MELANIE F. MEAUX

Role: DIF AUTHOR

Email: gsfc-gcmduso at mail.nasa.gov

GENE CARL FELDMAN

Role: TECHNICAL CONTACT

Phone: (301) 286-9428

Fax: (301) 286-0268

Email: gene.c.feldman at nasa.gov

Contact Address:

Data System Manager

NASA/Goddard Space Flight Center

Mailstop 614.8

City: Greenbelt

Province or State: MD

Postal Code: 20771

Country: USA

DR. CHARLES R. MCCLAIN

Role: INVESTIGATOR

Phone: 301-286-5377

Fax: 301-286-0268

Email: Charles.R.McClain at nasa.gov

Contact Address:

NASA/Goddard Space Flight Center

City: Greenbelt

Province or State: MD

Postal Code: 20771

Country: USA

Creation and Review Dates

DIF Creation Date: 2005-10-25

Last DIF Revision Date: 2006-04-11

Reformat as FGDC document

View Text Only Format

[ Update this Record ]