OSTM/Jason-2: Auxiliary FilesEntry ID: gov.noaa.class.J2-AUX
Abstract: ABSTRACT: This collection of data contains OSTM/Jason-2 Auxiliary data files. 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. These data are archived at the National Oceanographic Data Center (NODC) as accession 0044983 (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.
CURRENTNESS REFERENCE: ground condition
SPATIAL DATA ORGANIZATION INFORMATION
Indirect Spatial Reference: 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. The orbit inclination of 66 degrees North and South enables the satellite to cover most of the globe's unfrozen oceans. The orbit's repeat cycle is just under 10 days (9.9156 days to be precise, i.e., 10 days minus two hours) - in other words, the satellite passes over the same point on the Earth's surface (to within one kilometre) every ten days. This cycle is a trade-off between spatial and temporal resolution designed for the study of large-scale ocean variability. The fact that the orbit is prograde and not sun-synchronous also avoids aliasing of different tidal components at the same frequency. The orbit is also designed to pass over two dedicated ground calibration sites: Cap Senetosa in Corsica and the Harvest oil rig platform in California, USA.
Direct Spatial Reference: Point
SDTS Point and Vector Object Type: Point
NATIVE: Binary, NetCDF, ASCII, and Gridded Information in Binary Form (GRIB)
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: Auxiliary data files used to generate Level-2 products. Includes both static tabular data files and dynamic files which change/grow over time. Auxiliary files are produced outside of the Ocean Surface Topography Mission (OSTM) but are used in the production of Level-2 products.
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Data Set Citation
Dataset Originator/Creator: European Center for Medium range Weather Forecasting (ECMWF)FR/CNES > Centre National d'Etudes Spatiales, France
Dataset Title: OSTM/Jason-2: Auxiliary Files
Dataset Release Date: 2008-12-15
Dataset Release Place: World Wide Web
Dataset Publisher: CNES (Centre National d'Etudes Spatiales)
Data Presentation Form: 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: Please see the Jason-2 User Handbook online at http://www.class.ncdc.noaa.gov/release/data_available/jason/userhan...
LOGICAL CONSISTENCY REPORT: 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 systematic checks and ... routines for additional validation in accordance with the NOAA Environmental Satellite Processing Center (ESPC) to the CLASS Interface Control Document (ICD).
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.
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 will 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. 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. Specific to OSTM/Jason-2: Orbital information is distributed through CLASS at http://www.nsof.class.noaa.gov/saa/product.
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/
PROCESS DESCRIPTION: Please contact the original data producers (process contact) who are responsible for the generation of these files.
PROCESS DESCRIPTION: 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: Unknown
PROCESS DATE: 20081215
SOURCE PRODUCED CITATION ABBREVIATION: gov.noaa.class:J2_QA
ORIGINATOR: European Center for Medium range Weather Forecasting (ECMWF) .
ORIGINATOR: FR/CNES > Centre National d'Etudes Spatiales, France .
TITLE: OSTM/Jason-2: Auxiliary Files .
PUBLICATION DATE: 2008-12-15.
PUBLICATION PLACE: World Wide Web .
PUBLISHER: CNES (Centre National d'Etudes Spatiales) .
GEOSPATIAL DATA PRESENTATION FORM: data files .
OTHER CITATION DETAILS: Auxiliary data files used to generate Level-2 products. Auxiliary files are produced outside of OSTM but are used in the production of Level-2 products.
ONLINE LINKAGE: http://www.class.noaa.gov/nsaa/products/search?sub_id=0&datatype_fa... .
TYPE OF SOURCE MEDIA: digital files via FTP .
SOURCE TIME PERIOD OF CONTENT/BEGINNING TIME: 20081215 .
SOURCE TIME PERIOD OF CONTENT/ENDING TIME: Unknown .
SOURCE CURRENTNESS REFERENCE: publication date .
SOURCE CITATION ABBREVIATION: J2-AUX .
SOURCE CONTRIBUTION: Auxiliary data files used to generate Level-2 products. Includes both static tabular data files and dynamic files which change/grow over time. Auxiliary files are produced outside of OSTM but are used in the production of Level-2 products.
Access Constraints ACCESS CONSTRAINTS: File types in the Auxiliary data family which are produced by the European Center for Medium range Weather Forecasting (ECMWF) are restricted by ECMWF to the Jason-2 project team.
DISTRIBUTION LIABILITY: While NESDIS makes every effort to ensure that its databases are error-free, errors do occur. We ask that you notify us immediately of any errors that you ... discover in our data. We will make every effort to correct them. With respect to documents available from this server, neither the United States Government nor any of its employees, makes any warranty, express or implied, including the warranties of merchantability and fitness for a particular purpose; nor assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed; nor represents that its use would not infringe privately owned rights.
DISTRIBUTION LIABILITY: While NODC makes every effort to ensure that its databases are error-free, errors do occur. We ask that you notify us immediately of any errors that you discover in our data. We will make every effort to correct them. With respect to documents available from this server, neither the United States Government nor any of its employees, makes any warranty, express or implied, including the warranties of merchantability and fitness for a particular purpose; nor assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed; nor represents that its use would not infringe privately owned rights.
CUSTOM ORDER PROCESS: Contact NODC User Services at NODC.Services@noaa.gov (Phone 301-713-3277) or CLASS at firstname.lastname@example.org.
CUSTOM ORDER PROCESS: Please contact the NODC User Services Group at NODC.Services@noaa.gov.
Use Constraints For the restricted data families, users will only see listed those data types upon which they can search.
Data Set Progress
Distribution Size: 35539.56
Distribution Format: ASCII
Fees: FTP is free. Optical disks = $25.00, magnetic tape = $100 + service and handling
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: 301-713-3272 x126
Email: yongsheng.zhang at noaa.gov
NOAA National Oceanographic Data Center E/OC1 SSMC3, 4th floor, Room 4701 1315 East-West Highway
City: Silver Spring
Province or State: MD
Postal Code: 20910
Role: DIF AUTHOR
Phone: 301-713-3280 x127
Email: sheri.phillips at noaa.gov
1315 East-West Highway, E/OC1, SSMC3, 4th Floor
City: Silver Spring
Province or State: MD
Postal Code: 20910
Creation and Review Dates
DIF Creation Date: 2010-01-07
Last DIF Revision Date: 2011-11-04