[Location: Location_Category='GEOGRAPHIC REGION', Location_Type='GLOBAL OCEAN']
OSTM/Jason-2: TelemetryEntry ID: gov.noaa.class.J2-TEL
Abstract: ABSTRACT: OSTM/JASON-2 is a follow-on mission continuing the TOPEX/Poseidon and Jason-1, and is designed to ensure continuity of high quality measurements for ocean science and to provide operational products for assimilation and forecasting applications. The Jason-2 satellite was launched on 20 June 2008 and reached its nominal repetitive orbit on 4 July 2008. This collection of data contains ... OSTM/Jason-2 telemetry data. Dataset consists of raw Level-0 telemetry data from the Jason-2 spacecraft. There are three datatypes available: Housekeeping Telemetry - Recorded (HKTM-R) is stored on the spacecraft for later downlink, Payload Telemetry 1 (PLTM-1) is the payload science data from the core-mission payloads: Poseidon-3, DORIS, AMR, and GPSP and Payload Telemetry 2 (PLTM-2) is the payload science data from the passenger mission of opportunity payloads: CARMEN-2, L2T2 and LPT. They are available as CCSDS packet files. These data are archived at the National Oceanographic Data Center (NODC) as accession 0044986 (http://www.nodc.noaa.gov/cgi-bin/search/prod/accessionsView.pl/deta...) and distributed through the NOAA/NESDIS Comprehensive Large Array-data Stewardship System (CLASS, http://www.class.noaa.gov).
SUPPLEMENTAL INFORMATION: Satellite altimetry data applications include validation and assimilation into global wave models, high seas hazards monitoring, sea surface height and ocean currents (hurricane intensity forecasts and assimilation into operational ocean models, multi-mission altimetry, fisheries, and marine transport. Jason-2 raw telemetry downlinked to ground stations is forwarded to the quality control and processing centres. Telemetry is then processed to obtain level 1 data, i.e., data that are timed and located, expressed in the appropriate units, and checked for quality. (Jason-2's ground segment is a distributed system between NASA, CNES, Eumetsat and NOAA. On the terms and conditions specified with the quadripartite agreement for the Jason-2 project: raw data of the Poseidon3 altimeter, DORIS and the radiometer are processed by the NOAA and Eumetsat centres to product near-real time altimetry data (OGDR); raw data of the Poseidon-3 altimeter and the radiometer are only processed by the mission centre at CNES to product delayed time altimetry data (IGDR; S-IGDR, GDR and S-GDR)). Level 0 and Level 1 satellite altimetry data are of limited usefulness as they have not been processed for precise quality control, and are not typically widely distributed.
CURRENTNESS REFERENCE: ground condition
SPATIAL DATA ORGANIZATION INFORMATION
Indirect Spatial Reference: Jason-2 was placed into the same N-S orbit around the Earth as Jason-1, at an altitude of 1,336 kilometers, inclined 66 degrees, to provide virtually complete coverage of ice-free oceans.
Direct Spatial Reference: Point
SDTS Point and Vector Object Type: Point
NATIVE: CCSDS (Consultative Committee on Space Data System) packet files
Electronic download (FTP) of the data is free. There is a fee for copies of data on physical media. Optical disks are $25.00 per unit and magnetic tape is $100 per unit. Price does not include additional service and handling costs.
Purpose: PURPOSE: High-precision ocean altimetry measures the distance between a satellite and the ocean surface to within a few centimeters. Accurate observations of variations in sea surface height (ocean topography) provide scientists with information about the speed and direction of ocean currents and heat stored in the ocean. This information, in turn, reveals global climate variations. These telemetry data are further processed through Levels 1 and 2 in order to develop ocean analyses products.
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Data Set Citation
Dataset Originator/Creator: DOC/NOAA/NESDIS/OSDPD > Office of Satellite Data Processing and Distribution, NESDIS, NOAA, U.S. Department of CommerceEUMETSAT > European Meteorological Satellite Organisation
Dataset Title: OSTM/Jason-2: Telemetry
Dataset Release Date: 2008-12-15
Dataset Release Place: Silver Spring, MD
Dataset Publisher: NOAA National Oceanographic Data Center (through the CLASS distribution system)
Data Presentation Form: raw (level 0) data filesOnline Resource: http://www.class.noaa.gov/nsaa/products/search?sub_id=0&datatype_fa...
Start Date: 2008-07-01
Quality ATTRIBUTE ACCURACY REPORT: The sea surface height shall be provided with a global and ultimate rms accuracy of 3.4 cm (1 sigma) over 1 second averages along JASON-1 ground-tracks for typical sea-state conditions of 2 m SWH and 11 dB sigma-naught. The accuracy on wind speed in IGDR products shall be 1.6 m/s. Near Real Time Altimeter Validation System Reports (NRTAVS)are daily and cover the previous ... 10-day period; distributed through the CLASS system at http://www.nsof.class.noaa.gov/saa/products/
LOGICAL CONSISTENCY REPORT: Instrument calibrations and product quality shall be monitored at least weekly throughout the life of the mission. For each file sent, the Archive performs file validation of the following: file name, file size, and file checksum. CLASS currently performs file name validation. CLASS performs checksum algorithm and routines for additional validation in accordance with the NOAA Environmental Satellite Processing Center (ESPC) to the CLASS Interface Control Document (ICD). OSTM/Jason-2: NRTAVS QA Reports - Quality Reports from the Near Real-Time Altimetry Validation System (NRTAVS). Reports are daily and cover the previous 10-day period; distributed through CLASS at http://www.nsof.class.noaa.gov/saa/products/
COMPLETENESS REPORT: Validation failure will result in placing the file in a hold state. The Access Contact for the Producer will be contacted by CLASS Operations personnel. Information about updates and edits to Jason-2 data is available through CLASS at http://www.class.ncdc.noaa.gov/notification/news.htm#5
HORIZONTAL POSITIONAL ACCURACY REPORT: The orbit maintenance requirements for altimetry missions are usually that the deviation of the actual ground track from the nominal one is kept below 1 km and that the mean local nodal crossing time matches the nominal one to better than to within five minutes. The orbit maintenance strategy aims for minimum disturbance of the payload operation. In-plane manoeuvres are used for altitude adjustment to compensate for the effects of air-drag. This altitude decay controls affects the ground-track repeatability, mainly in the equatorial regions. The frequency of these manoeuvres is determined by the rate of orbital decay, which in turn is determined by the air density, and this is a function of solar activity. The nominal rate for these in-plane manoeuvres is nominally twice a month. They do not interrupt the operations of most sensors. Out-of-plane corrections are used to correct rectify the steady drift of inclination mainly caused by solar and lunar gravity perturbations. The solar wind also influences inclination, but its contribution is typically an order of magnitude smaller than the one given made by solar and lunar gravity. Inclination drift degrades ground-track maintenance at high latitudes. The drift rate does not depend on air density and corrections are required every few months. As they are out-of-plane they require a 90-degree rotation of the spacecraft, to align the thrusters with the required thrust direction, so these manoeuvres will are performed in during eclipse to avoid the risk of optical sensors viewing the sun. Jason-2's orbit is identical to that of Jason-1 (and that of Topex/Poseidon previously). It is optimized to study large-scale ocean variability and to provide coverage of 90% of the world's oceans over a ten-day cycle. Jason-2's high altitude (1,336 kilometres) reduces interactions with the Earth's atmosphere and gravity field to a minimum, thus making orbit determination easier and more precise.
VERTICAL POSITIONAL ACCURACY REPORT: Please see the horizontal positional report. Specific to OSTM/Jason-2: Orbital information is distributed through CLASS at http://www.nsof.class.noaa.gov/saa/products/. The satellites Topex/Poseidon, Jason-1, and Jason-2 (OSTM) carry three tracking systems (DORIS, GPS, and laser telemetry) that enable their position in space (ephemeris) to be determined with an accuracy of +/- 1 cm.
PROCESS DESCRIPTION: Raw telemetry downlinked to the ground stations is forwarded to the quality control and processing centres. Telemetry is then processed to obtain level 1 data, i.e., data that are timed and located, expressed in the appropriate units, and checked for quality. (Jason-2's ground segment is a distributed system between NASA, CNES, Eumetsat and NOAA. On the terms and conditions specified with the quadripartite agreement for the Jason-2 project: Raw data of the Poseidon3 altimeter, DORIS and the radiometer are processed by the NOAA and Eumetsat centres to product near-real time altimetry data (OGDR); Raw data of the Poseidon-3 altimeter and the radiometer are only processed by the mission centre at CNES to product delayed time altimetry data (IGDR; S-IGDR, GDR and S-GDR).
PROCESS DESCRIPTION: NASA JPL and NOAA LSA are responsible for developing the Quality Reports from the Near Real-Time Altimetry Validation System (NRTAVS). Reports are daily and cover the previous 10-day period.
SOURCE USED CITATION ABBREVIATION: Jason-2 QA
PROCESS DATE: Not complete
PROCESS DATE: 20081215
SOURCE PRODUCED CITATION ABBREVIATION: gov.noaa.class:J2_QA
ORIGINATOR: DOC/NOAA/NESDIS/OSDPD > Office of Satellite Data Processing and Distribution, NESDIS, NOAA, U.S. Department of Commerce and, .
ORIGINATOR: EUMETSAT > European Meteorological Satellite Organisation .
TITLE: OSTM/Jason-2: Telemetry (restricted)(J2-TEL) .
PUBLICATION DATE: 2008-07-.
PUBLICATION PLACE: Silver Spring, MD .
PUBLISHER: NOAA National Oceanographic Data Center .
GEOSPATIAL DATA PRESENTATION FORM: CCSDS packet files .
OTHER CITATION DETAILS: These data are archived at the NODC under accession number 0044986. All telemetry data (J2-TEL) are restricted to the project team, per the mission's 4-partner Memorandum of Understanding. For these restricted data families, users will only see listed those datatypes upon which they can search.
ONLINE LINKAGE: http://www.nodc.noaa.gov/cgi-bin/search/prod/accessionsView.pl/deta... .
TYPE OF SOURCE MEDIA: digital files (CCSDS packet files) via FTP .
SOURCE TIME PERIOD OF CONTENT/BEGINNING TIME: 20081215 .
SOURCE TIME PERIOD OF CONTENT/ENDING TIME: Present .
SOURCE CURRENTNESS REFERENCE: ground condition .
SOURCE CITATION ABBREVIATION: Jason-2 telemetry (level 0) data .
SOURCE CONTRIBUTION: Telemetry - Dataset consists of raw Level-0 telemetry data from the Jason-2 spacecraft. There are three datatypes available: Housekeeping Telemetry - Recorded (HKTM-R) is stored on the spacecraft for later downlink; Payload Telemetry 1 (PLTM-1) is the payload science data from the core-mission payloads: Poseidon-3, DORIS, AMR, and GPSP; and Payload Telemetry 2 (PLTM-2) is the payload science data from the passenger mission of opportunity payloads: CARMEN-2, L2T2 and LPT. They are available as CCSDS packet files. All telemetry data (J2-TEL) are restricted to the project team, per the mission's 4-partner Memorandum of Understanding.
Access Constraints None
Distribution Media: Online
Fees: No fees
Role: TECHNICAL CONTACT
Phone: (865) 574-7447
Email: uso at daac.ornl.gov
ORNL DAAC User Services Office Oak Ridge National Laboratory
City: Oak Ridge
Province or State: TN
Postal Code: 37831-6407
Role: SERF AUTHOR
Phone: (301) 614-6898
Email: Tyler.B.Stevens at nasa.gov
NASA Goddard Space Flight Center Global Change Master Directory
Province or State: MD
Postal Code: 20771
Yaxing Wei, Suresh-Kumar Santhana-Vannan, and Robert B. Cook (2009-08-12), Discover, Visualize, and Deliver Geospatial Data through OGC Standards-based WebGIS System, In Proceeding of the 17th International Conference on Geoinformatics (Geoinformatics 2009), Fairfax, VA, USA
Creation and Review Dates