Sensor Data Records (SDR) from the GEOSAT Exact Repeat Mission from 8 November 1986 to 31 December 1989 (NCEI Accession 0054289)
This dataset contains the sensor data records (SDRs) from the Geodetic Satellite (GEOSAT) Exact Repeat Mission (ERM) for the time period of November 8, 1986 to December 31, 1989. Parameters include: time, orbit, latitude/longitude, and sea surface height. Corrections to the data include: sea level, wind and wave data, tides, dry and wet troposphere, ionosphere, height bias, altimeter crossover differences, altimeter sea surface measurement, and spacecraft orientation. Data were originally submitted to the NODC by the U.S. Navy via the NOAA National Oceanic Service on 9-track tapes. These current data were recovered from the original 9-track tapes archived at the NODC by Data Recovery International, Inc., Hurst, TX. Reports on non-observation periods and any missing data are listed in the 'about' subfolder for this accession. Data is in ASCII format and is archived with associated documentation in the 'data' folder.
The US Navy Geosat radar altimeter mission lasted for nearly 5 years (March 1985 to January 1990) and collected approximately 750 million measurements of sea level, wave height, and wind speed over the global oceans. During the Geodetic Mission (March 1985 to September 1986), the satellite did not repeat its ground track for the duration of the mission. The orbit of the satellite was changed in late 1986 to begin the Exact Repeat Mission (ERM) which lasted from October, 1986 until the satellite quit functioning in January 1990. During the ERM, the satellite repeated its ground track every 17 days. Data were initially processed by the Johns Hopkins University Applied Physics Laboratory in Laurel, MD in coordination with the NOAA/NOS Satellite Altimeter Group. Data products were transferred to the NOAA National Oceanographic Data Center (NODC) for distribution. Additional GEOSAT data is held at the NODC under separate accession numbers.
The US Navy Geosat radar altimeter mission lasted for nearly 5 years (March 1985 to January 1990) and collected approximately 750 million measurements of sea level, wave height, and wind speed over the global oceans. During the Geodetic Mission (March 1985 to September 1986), the satellite did not repeat its ground track for the duration of the mission. The orbit of the satellite was changed in late 1986 to begin the Exact Repeat Mission (ERM) which lasted from October, 1986 until the satellite quit functioning in January 1990. During the ERM, the satellite repeated its ground track every 17 days. Data were initially processed by the Johns Hopkins University Applied Physics Laboratory in Laurel, MD in coordination with the NOAA/NOS Satellite Altimeter Group. Data products were transferred to the NOAA National Oceanographic Data Center (NODC) for distribution. Additional GEOSAT data is held at the NODC under separate accession numbers.
Dataset Citation
- Cite as: Lillibridge, John; NOAA Center for Satellite Applications and Research (2009). Sensor Data Records (SDR) from the GEOSAT Exact Repeat Mission from 8 November 1986 to 31 December 1989 (NCEI Accession 0054289). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0054289. Accessed [date].
Dataset Identifiers
ISO 19115-2 Metadata
gov.noaa.nodc:0054289
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Ordering Instructions | Contact NCEI for other distribution options and instructions. |
Distributor |
NOAA National Centers for Environmental Information +1-301-713-3277 NCEI.Info@noaa.gov |
Dataset Point of Contact |
NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Time Period | 1986-11-08 to 1989-12-31 |
Spatial Bounding Box Coordinates |
West: -180
East: 180
South: -72
North: 72
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Data Presentation Form | Digital table - digital representation of facts or figures systematically displayed, especially in columns |
Dataset Progress Status | Complete - production of the data has been completed Historical archive - data has been stored in an offline storage facility |
Data Update Frequency | As needed |
Supplemental Information | 1. Data Format The format description of the ASCII SDR files can be found in " JHU/APL, 1985: GEOSAT-A Data Users / Ground System Interface Control Document (ICD)". JHU/APL, 7292-9510 Rev. 1, Laurel, MD, 122pp. " 2. Periods of ERM data without satellite observation/observation failure November 19-25, 1987; August 18-25, 1988; March 16-22, 1989; October 4, 1989 January 5, 1990 Some data loss (totally 152 records) also found in eight 9-track tapes (each lost 19 records) when the data in those tapes were recovered during 4/2008 to 4/2009. |
Purpose | This dataset is available to the public for a wide variety of uses including scientific research and analysis. |
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Data Center keywords | NODC COLLECTING INSTITUTION NAMES THESAURUS NODC SUBMITTING INSTITUTION NAMES THESAURUS Global Change Master Directory (GCMD) Data Center Keywords |
Platform keywords | NODC PLATFORM NAMES THESAURUS Global Change Master Directory (GCMD) Platform Keywords ICES/SeaDataNet Ship Codes |
Instrument keywords | NODC INSTRUMENT TYPES THESAURUS Global Change Master Directory (GCMD) Instrument Keywords |
Place keywords | NODC SEA AREA NAMES THESAURUS Global Change Master Directory (GCMD) Location Keywords |
Keywords | NCEI ACCESSION NUMBER |
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Last Modified: 2024-04-17T11:34:59Z
For questions about the information on this page, please email: ncei.info@noaa.gov
For questions about the information on this page, please email: ncei.info@noaa.gov