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Geosat Altimeter Geophysical Data Records from the Geodetic and Exact Repeat Missions, Enhanced with the JGM-3 Gravity Model
Entry ID: GEOSAT_GM_ERM_NODC


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Summary
Abstract: This June 1997 release of satellite altimeter data collected by the U.S.
Navy Geosat mission represents a significant improvement over
previous versions. The ten CD-ROMs contain geophysical data records
(GDRs) which span both the Geodetic Mission (GM: 3/85 - 9/86) and Exact
Repeat Mission (ERM: 11/86 - 12/89). The GDRs incorporate a new 10-cm
satellite orbit computed by the NASA Goddard Space Flight Center using
the JGM-3 gravity model. In addition, the overall accuracy of the data
is increased by new geophysical corrections (CSR 3.0 tides; model
troposphere from the NCEP/NCAR reanalysis; IRI95 ionosphere; a new sea
state bias based on wind, wave and satellite attitude; and corrections
for clock drift and timing bias). The GDRs are stored in daily files
using the same 78-byte, integer binary format as previous releases of
the Geosat GDRs. CD#1 (first GM) and CD#5 (first ERM) contain
documentation, tabular data, "high-precision" corrections, figures, and
the CD-ROM handbook which can be viewed

The following table shows how the daily GDRs are stored in the ten CD
set, for the entire mission:

CD Mission Start Yr_Day End Yr_Day # GDRs
-- ------- ------------ ---------- ------
1 GM 1985_090 1985_227 138
2 GM 1985_228 1985_365 138
3 GM 1986_001 1986_138 138
4 GM 1986_139 1986_273 135
5 ERM 1986_312 1987_082 136
6 ERM 1987_083 1987_235 153
7 ERM 1987_236 1988_040 163
8 ERM 1988_041 1988_210 170
9 ERM 1988_211 1989_031 187
10 ERM 1989_032 1989_364 298


Customers can order the complete set of 10 discs, holding both the
Geodetic and Exact Repeat Mission data, or make separate purchases of
the Geodetic Mission (Discs 1-4) or the Exact Repeat Mission (Discs
5-10).


NOTE: Advanced programming skills are strongly recommended for users of
this CD-ROM product.

Related URL
Link: GET DATA
Description: CD-ROM Order page


Link: GET DATA
Description: NOAA Server access page


Geographic Coverage
 N: 72.0 S: -72.0  E: 180.0  W: -180.0

Data Set Citation
Dataset Originator/Creator: NOAA/NESDIS/National Oceanographic Data Center
Dataset Title: GEOSAT Altimeter JGM-3 Data from the Geodetic Mission and Exact Repeat Mission on CD-ROM
Dataset Release Date: 1997/05
Version: 1
Online Resource: www.nodc.noaa.gov


Temporal Coverage
Start Date: 1985-03-31
Stop Date: 1989-12-31


Location Keywords
OCEAN > ATLANTIC OCEAN
OCEAN > INDIAN OCEAN
OCEAN > PACIFIC OCEAN
GEOGRAPHIC REGION > GLOBAL
GEOGRAPHIC REGION > GLOBAL OCEAN


Science Keywords
ATMOSPHERE >ATMOSPHERIC WINDS >SURFACE WINDS >WIND SPEED    [Definition]
OCEANS >MARINE GEOPHYSICS >MARINE GRAVITY FIELD    [Definition]
OCEANS >OCEAN WAVES >SEA STATE    [Definition]
OCEANS >OCEAN WAVES >SIGNIFICANT WAVE HEIGHT    [Definition]
OCEANS >OCEAN WAVES >WIND WAVES    [Definition]
OCEANS >OCEAN WINDS >SURFACE WINDS >WIND SPEED    [Definition]
OCEANS >SEA SURFACE TOPOGRAPHY >SEA SURFACE HEIGHT    [Definition]
SOLID EARTH >GRAVITY/GRAVITATIONAL FIELD >GRAVITATIONAL FIELD    [Definition]


ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
ELEVATION
GEOSCIENTIFIC INFORMATION
OCEANS


Platform
GEOSAT >Geodetic Satellite    [Information]


Instrument
ALTIMETERS    [Information]
RADAR ALTIMETERS    [Information]


Project
ESIP >Earth Science Information Partners Program    [Information]


Quality
Orbit calculations using the JGM-3 gravity model have reduced the
radial orbit error to 10-15 cm.


Access Constraints
Due to restrictions placed on the NODC by the US Navy, foreign
requesters must follow special procedures when ordering GEOSAT
data. Please contact NODC for further information.


Use Constraints
NOAA and NODC would appreciate recognition as the resource from which these
data were obtained in any publications and/or other representations of these
data.


Keywords
SATELLITE ALTIMETRY
W00012


Originating Center
NODC


Data Center
National Oceanographic Data Center, NESDIS, NOAA, U.S. Department of Commerce    [Information]
Data Center URL: http://www.nodc.noaa.gov/

Data Center Personnel
Name: NODC USER SERVICES
Phone: 301-713-3277
Fax: 301-713-3302
Email: NODC.Services at noaa.gov
Contact Address:
National Oceanographic Data Center
User Services Branch
NOAA/NESDIS E/OC1
SSMC3, 4th Floor
1315 East-West Highway
City: Silver Spring
Province or State: MD
Postal Code: 20910-3282
Country: USA



Distribution
Distribution_Media: CD-ROM
Distribution_Size: 10 CD-ROMs
Fees: There is a fee for the CD-ROMs.


Personnel
MELANIE F. MEAUX
Role: DIF AUTHOR
Email: gsfc-gcmduso at mail.nasa.gov


JOHN LILLIBRIDGE
Role: TECHNICAL CONTACT
Phone: (301)713-2857 x 121
Fax: (301)713-3136
Email: John.Lillibridge at noaa.gov
Contact Address:
NOAA/NESDIS/STAR: E/RA31
1335 East-West Hwy. #5344
City: Silver Spring
Province or State: MD
Postal Code: 20910
Country: USA


Publications/References
NODC Laboratory for Satellite Altimetry. 1997. The Geosat Altimeter
JGM-3 GDRs on CD-ROM (Handbook). Silver Spring, Maryland.
http://ibis.grdl.noaa.gov/SAT/gdrs/geosat_handbook/

Creation and Review Dates
Last DIF Revision Date: 2009-01-08


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