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SeaWiFS Level 3 Global Standard Mapped Product Suite
Entry ID: OBPG_SEAWIFS_L3_MAPPED

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Summary
Abstract: This data set consists of satellite measurements of global ocean color,
photosynthetically Active Radiation (PAR) and Normalized Difference Vegetation
Index (NDVI) data obtained by the Sea-viewing Wide Field-of-view Sensor
(SeaWiFS), in orbit on the OrbView-2 (formerly SeaStar) platform. SeaWiFS ocean
color products are processed and distributed by the Ocean Biology Processing
Group (OBPG). Processing details can be found at
http://oceancolor.gsfc.nasa.gov/DOCS/SW_proc.html

SeaWiFS acquires approximately 15 pole-to-pole orbital swaths of data per day,
and approximately 90% of the ocean surface is scanned every two days. Visible
and near infrared raw radiance counts are collected (Level 1A data) and are
converted to geophysical parameters (Level 2 data). Level 3 (9 km) data
processing involves both temporal and spatial binning and utilizes Level 2
Global Area Coverage (GAC) (4 km) data as input.

The SeaWiFS Level 3 standard mapped image (SMI) products are integer
representations of binned data products. This image is an 8-bit,
two-dimensional array of an Equidistant Cylindrical projection of the globe.
(The capability to produce 16-bit SMI products has been implemented by the
OBPG, and the SeaWiFS Ocean Color products are expected to be regenerated as
16-bits values at the next reprocessing in about 1 year.) Each SMI product
contains one image of a geophysical parameter and is stored in one physical HDF
file. The Level 3 binned products are used to generate mapped data products on
9 km equi-rectangular projection (and 4 km for NDVI products). The products
are generated for the following binning periods: Daily, 8-Day, Monthly, Monthly
Climatology, Seasonal, Seasonal Climatology, Annual, Cumulative.

Five SMI products are generated from each standard Ocean Color binned data
product, one for each of the following geophysical parameters:

-Chlorophyll-a concentration (CHLO)
-Normalized water-leaving radiance at band 5 (L555)
-Aerosol optical thickness at band 8 for atmospheric correction (T865)
-Angstrom coefficient, 510-865 nm, for atmospheric correction (A510)
-Diffuse attenuation coefficient at 490 nm (measure of optical clarity) (K490)

Other SMI products:
-SeaWiFS Level 3 PAR refers to false-colored images of Photosynthetically
Active Radiation (PAR) from the sun 400-700 nm.
For additional information about the PAR algorithm see
http://oceancolor.gsfc.nasa.gov/DOCS/seawifs_par_wfigs.pdf
-SeaWiFS NDVI refers to images of the Normalized Difference Vegetation Index -
an indicator of chlorophyll distributions on land (NDVI)

Each SMI product represents data binned over the period covered by the parent
product. The arithmetic mean is used in each case to obtain the values for the
SMI grid points from the binned data products.

More detailed information on the Level-3 Standard Mapped Image data product
format specifications can be found in the document at
http://oceancolor.gsfc.nasa.gov/DOCS/Ocean_Level-3_SMI_Products.pdf

Browse Level 3 Standard Mapped Images (SMI) at
http://oceancolor.gsfc.nasa.gov/cgi/level3.pl

The SeaWiFS Level 3 Mapped data files are available from the FTP site at
ftp://oceans.gsfc.nasa.gov/SeaWiFS/Mapped/

Related URL
Link: GET DATA
Description: Access SeaWiFS Level 3 Mapped Data


Link: GET DATA
Description: Browse Level 3 Standard Mapped Images


Link: GET RELATED SERVICE METADATA (SERF)
Description: SeaWiFS Data Analysis System (SeaDAS) for processing, display, analysis, and
quality control of ocean products.


Link: GET RELATED SERVICE METADATA (SERF)
Description: Ocean Color Time-Series Online Visualization and Analysis System (Giovanni)


Link: VIEW PROJECT HOME PAGE
Description: SeaWIFS Project


Link: VIEW RELATED INFORMATION
Link: VIEW RELATED INFORMATION
Description: Data and Processing documentation


Link: VIEW RELATED INFORMATION
Description: Ocean Color Forum


This description is a member of a collection. Click to see members of this collection.

Geographic Coverage
 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
OCEAN > INDIAN OCEAN
OCEAN > SOUTHERN OCEAN
OCEAN > PACIFIC OCEAN
GEOGRAPHIC REGION > GLOBAL
GEOGRAPHIC REGION > GLOBAL OCEAN
GEOGRAPHIC REGION > POLAR


Data Resolution
Latitude Resolution: 4, 9 km
Longitude Resolution: 4, 9 km
Temporal Resolution: Monthly Climatology


Science Keywords
ATMOSPHERE >AEROSOLS >AEROSOL BACKSCATTER >AEROSOL REFLECTANCE    [Definition]
ATMOSPHERE >AEROSOLS >AEROSOL EXTINCTION    [Definition]
ATMOSPHERE >AEROSOLS >AEROSOL OPTICAL DEPTH/THICKNESS >AEROSOL OPTICAL THICKNESS    [Definition]
ATMOSPHERE >AEROSOLS >AEROSOL RADIANCE    [Definition]
BIOSPHERE >VEGETATION >VEGETATION INDEX >NDVI    [Definition]
OCEANS >OCEAN CHEMISTRY >PIGMENTS    [Definition]
OCEANS >OCEAN OPTICS >ATTENUATION/TRANSMISSION    [Definition]
OCEANS >OCEAN OPTICS >EXTINCTION COEFFICIENTS >DIFFUSE ATTENUATION COEFFICIENT    [Definition]
OCEANS >OCEAN OPTICS >OCEAN COLOR    [Definition]
OCEANS >OCEAN OPTICS >PHOTOSYNTHETICALLY ACTIVE RADIATION >PAR    [Definition]
OCEANS >OCEAN OPTICS >WATER-LEAVING RADIANCE >NORMALIZED WATER-LEAVING RADIANCE    [Definition]
OCEANS >OCEAN CHEMISTRY >PIGMENTS >CHLOROPHYLL    [Definition]
OCEANS >OCEAN CHEMISTRY >PIGMENTS >CHLOROPHYLL >CHLOROPHYLL-A    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
GEOSCIENTIFIC INFORMATION
OCEANS


Platform
SEASTAR >Orbital Sciences Corporation OrbView-2 Satellite    [Information]


Instrument
SEAWIFS >Sea-Viewing Wide Field-of-View Sensor    [Information]


Project
EOS >Earth Observing System    [Information]
EOSDIS >Earth Observing System Data Information System    [Information]
ESIP >Earth Science Information Partners Program    [Information]
SEAWIFS >Sea-viewing Wide Field-of-view Sensor    [Information]


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    [Information]
Data Center URL: http://oceancolor.gsfc.nasa.gov/

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: 2008-05-20

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