MODIS/Aqua and SeaWiFS Level 3 9KM Daily Merged Chlorophyll Product
Entry ID: OBPG_MODIS_AQUA_SEAWIFS_L3_MDC

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Summary
Abstract: This data set consists of merged satellite measurements of global ocean
chlorophyll data derived from the Moderate Resolution Imaging Spectroradiometer
(MODIS), in orbit on the Aqua (formerly EOS PM) platform, and the Sea-viewing
Wide Field-of-view Sensor (SeaWIFS), in orbit on the OrbView-2 (formerly
SeaStar) platform.

Aqua MODIS and SeaWiFS products are processed and distributed by the Ocean
Biology Processing Group (OBPG). MODIS/Aqua processing details can be found at
http://oceancolor.gsfc.nasa.gov/DOCS/MODISA_processing.html . SeaWiFS
processing details can be found at
http://oceancolor.gsfc.nasa.gov/DOCS/SW_proc.html .

The Aqua MODIS and SeaWiFS Level-3 9 km merged chlorophyll products are
generated routinely for daily, 8-day, monthly, seasonal and annual time periods
once the refined products for each of the contributing missions are processed.
Increased coverage over the single mission product is realized through the
merging of the two data sets. There is a substantial improvement (> 50%) in
coverage at the daily level, decreasing with the increase in the temporal
period binned.

The MODIS/SeaWiFS merged product is generated in essentially two steps. First,
the MODIS Level-3 file is reduced in resolution from 4 to 9 km to match the
global resolution of the SeaWiFS chlorophyll product. This involves combining
the sum and sum squared field values for the (typically) four 4 km bins into
the corresponding single 9 km bin. In the second step, the reduced-resolution
MODIS file and the corresponding SeaWiFS Level-3 file are combined. Because
both input files are at the same 9 km resolution, the summing is performed
bin-by-bin. The Standard Mapped Image file that is generated from the merged
Level-3 binned file stores scaled 16 bit integer values rather than the usual 8
bit values, giving the user much greater numerical precision. The actual
images displayed on the Ocean Color website in PNG format are provided for
visual inspection only.

Browse Level 3 Standard Mapped Images (SMI) at
http://oceancolor.gsfc.nasa.gov/cgi/l3

The Aqua MODIS and SeaWiFS Level 3 Merged Chlorophyll data files are available
from the FTP site at ftp://oceans.gsfc.nasa.gov/Merged/

Related URL
Link: GET DATA
Description: Access Daily Merged MODIS-Aqua/SeaWiFS Level 3 Chlorophyll_a 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: VIEW PROJECT HOME PAGE
Description: MODIS WEB


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


Parent DIF
This data set description is a member of a collection. The collection is described in
MODIS_OCEAN_PARENT


Geographic Coverage
 N: 90.0 S: -90.0  E: 180.0  W: -180.0

Temporal Coverage
Start Date: 2002-07-04


Location Keywords
OCEAN > ARCTIC OCEAN
OCEAN > ATLANTIC OCEAN
OCEAN > INDIAN OCEAN
OCEAN > SOUTHERN OCEAN
OCEAN > PACIFIC OCEAN
GEOGRAPHIC REGION > GLOBAL OCEAN
GEOGRAPHIC REGION > POLAR


Data Resolution
Latitude Resolution: 9 km
Longitude Resolution: 9 km
Temporal Resolution: Daily


Science Keywords
OCEANS >OCEAN CHEMISTRY >PIGMENTS    [Definition]


ISO Topic Category
BIOTA
OCEANS


Platform
SEASTAR >Orbital Sciences Corporation OrbView-2 Satellite    [Information]
AQUA >Earth Observing System, AQUA    [Information]


Instrument
MODIS >Moderate-Resolution Imaging Spectroradiometer    [Information]
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]


Access Constraints
None


Use Constraints
Publications of research results utilizing these data must acknowledge 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: 2004-05-21
Last DIF Revision Date: 2012-01-12

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