Global-merged IR Brightness Temperature
Entry ID: GES_DISC_MERG_V6
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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
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.
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.
|N: 60.0||S: -60.0||E: 180.0||W: -180.0||
Data Set Citation
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
Online Resource: http://www.cpc.ncep.noaa.gov/products/global_precip/html/README
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)
Online Resource: http://disc.gsfc.nasa.gov/datacollection/MERG_V6.shtml
|Start Date: 2000-02-07|
Longitude Resolution: 4 km
Temporal Resolution: 30 min
|ATMOSPHERE >WEATHER EVENTS >MONSOONS [Definition]|
|ATMOSPHERE >CLOUDS [Definition]|
ISO Topic Category
|GEOSTATIONARY SATELLITES [Information]|
|MVIRI >Meteosat Visible Infra-Red Imager|
|VISSR-GMS >Visible and Infrared Spin Scan Radiometer (GMS Series) [Information]|
|EOSDIS >Earth Observing System Data Information System [Information]|
|ESIP >Earth Science Information Partners Program [Information]|
|TRMM >Tropical Rainfall Measuring Mission Project [Information]|
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).
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
Data Center URL: http://disc.gsfc.nasa.gov/
Dataset ID: GES_DISC_MERG_V6
Distribution_Size: 33 MB
Email: johnj at essic.umd.edu
Cooperative Institute for Climate and Satellites
University of Maryland
City: College Park
Province or State: MD
Postal Code: 20740-3823
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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