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Global-merged IR Brightness Temperature
Entry ID: GES_DISC_MERG_V6

[ Get Data ]

Summary
Abstract: The Climate Prediction Center/NCEP/NWS is now making available via anonymous ftp (in
digital form) globally-merged (60N-60S) pixel-resolution IR brightness temperature
data (equivalent blackbody temps), merged from all available geostationary satellites
(GOES-8/10, METEOSAT-7/5 & GMS). The availability of data from METEOSAT-5, which is
located at 63E at the present time, yields a unique opportunity for total global
(60N-60S) coverage.

The global IR composites available are now available in digital form for every 1/2
hour via a weekly rotating file. The data have been corrected for "zenith angle
dependence", i.e. IR temperatures for locations far from satellite nadir are
erroneously cold due to a combination of geometric effects and radiometric path
extinction effects. This correction allows for the merging of the IR data from the
various geostationary satellites with greatly reduced discontinuities at their
boundaries. Some residual differences among the data exist since the IR channels
aboard the various spacecraft have slightly different characteristics and no
intercalibration among the sensors has been performed. We are in the process of
performing such an intercalibration, although this effect is considerably smaller
than the zenith angle effects.

The data availability are delayed by 3 days from real-time to abide by international
data exchange agreements between NOAA and EUMETSAT (the METEOSAT data providers). We
are working on a web page that will have an image browse capability (at reduced
resolution) along with tools to make data downloading easier.

The data are too voluminous (33 MB per 1/2 hour) to service requests for historical data
or spatial subsets of the data. However, the National Climatic Data Center (NCDC) has
agreed to be the official archive & distribution center for these data, although the
infrastructure for this activity is not yet in place.

Please note that, at present, we are using a makeshift assortment of existing in-house
hardware to perform these tasks and, while reliable over the course of the past few
months, is not optimal for the tasks at hand. We are in the process of procuring a
dedicated system for this activity which should be installed within the next 2-3 months.

Related URL
Link: GET DATA > ON-LINE ARCHIVE
Description: Access the data via FTP.


Link: GET DATA > MIRADOR
Description: Mirador (from Spanish, a place providing a wide view) is a Google-based data archive search interface that allows searching, browsing, and retrieving of Earth science data at NASA GES DISC.


Link: GET DATA > GDS
Description: The GrADS Data Server (GDS, formerly known as GrADS-DODS Server) is another form of OPeNDAP that provides subsetting and some analysis services across the internet.


Link: VIEW RELATED INFORMATION
Description: Information and data access for all of the Goddard DAAC's hydrology data holdings, including TRMM data from the TMI, Precipitation Radar (PR) and Visible and Infrared Scanner (VIRS) instruments, the Ground Validation (GV) radar data, and ancillary and correlative data products.


Link: VIEW RELATED INFORMATION > USER'S GUIDE
Description: More details about the product.


Geographic Coverage
 N: 60.0 S: -60.0  E: 180.0  W: -180.0

Data Set Citation
Dataset Originator/Creator: Climate Prediction Center/NCEP/NWS
Dataset Title: NCEP/CPC 4km Global (60N - 60S) IR Dataset
Dataset Series Name: MERG
Dataset Release Date: May 2006
Dataset Release Place: College Park, MD
Dataset Publisher: Climate Prediction Center/NCEP/NWS
Version: 6
Online Resource: http://www.cpc.ncep.noaa.gov/products/global_precip/html/README

Dataset Originator/Creator: Janowiak, John E., Robert J. Joyce, Yelena Yarosh
Dataset Title: NCEP Global-merged IR Brightness Temperature
Dataset Release Place: Greenbelt, MD, USA
Dataset Publisher: Goddard Space Flight Center Distributed Active Archive Center (GSFC DAAC)
Version: 6
Online Resource: http://disc.gsfc.nasa.gov/datacollection/MERG_V6.shtml


Temporal Coverage
Start Date: 2000-02-07


Location Keywords
GEOGRAPHIC REGION > GLOBAL


Data Resolution
Latitude Resolution: 4 km
Longitude Resolution: 4 km
Temporal Resolution: 30 min


Science Keywords
ATMOSPHERE >WEATHER EVENTS >MONSOONS    [Definition]
ATMOSPHERE >CLOUDS    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE


Platform
GEOSTATIONARY SATELLITES    [Information]


Instrument
GOES-8 IMAGER
MVIRI >Meteosat Visible Infra-Red Imager
VISSR-GMS >Visible and Infrared Spin Scan Radiometer (GMS Series)    [Information]


Project
EOSDIS >Earth Observing System Data Information System    [Information]
ESIP >Earth Science Information Partners Program    [Information]
TRMM >Tropical Rainfall Measuring Mission Project    [Information]


Use Constraints
Please acknowledge:

This work is supported by funding from the NOAA Office of Global Programs
for the Global Precipitation Climatology Project (GPCP and by NASA via the
Tropical Rainfall Measuring Mission (TRMM).


Data Center
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA    [Information]
Data Center URL: http://disc.gsfc.nasa.gov/
Dataset ID: GES_DISC_MERG_V6

Data Center Personnel
Name: GES DISC HELP DESK SUPPORT GROUP
Phone: 301-614-5224
Fax: 301-614-5268
Email: gsfc-help-disc at lists.nasa.gov
Contact Address:
Goddard Earth Sciences Data and Information Services Center
Code 610.2
NASA Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA



Distribution
Distribution_Media: FTP
Distribution_Size: 33 MB
Distribution_Format: binary
Fees: None


Personnel
JOHN JANOWIAK
Role: INVESTIGATOR
Phone: 301-405-0468
Email: johnj at essic.umd.edu
Contact Address:
Cooperative Institute for Climate and Satellites
University of Maryland
City: College Park
Province or State: MD
Postal Code: 20740-3823
Country: USA


Publications/References
Janowiak, John E., Robert J. Joyce, Yelena Yarosh, 2001: A Real–Time Global Half–Hourly Pixel–Resolution Infrared Dataset and Its Applications. Bull. Amer. Meteor. Soc., 82, 205–217.

Creation and Review Dates
DIF Creation Date: 2009-09-03
Last DIF Revision Date: 2016-01-20
Future DIF Review Date: 2016-07-31



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