gov.noaa.ncdc:C01371 eng; USA utf8 dataset NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact NCEI Contact Information Information for contacts at NCEI. information pointOfContact 2024-07-01 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) MetOp Series Global Navigation Satellite System Receiver for Atmospheric Sounding (GRAS) Level 1B Data GNSS-GRAS-L1b 2007-09-14 publication gov.noaa.class:GRAS gov.noaa.ncdc:C01371 National Centers for Environmental Information publisher European Meteorological Satellite Organisation originator European Meteorological Satellite Organisation author The Global navigation satellite system Receiver for Atmospheric Sounding (GRAS) is a radio occultation receiver onboard the European MetOp satellite series. GRAS uses radio occultation to measure vertical profiles of atmospheric temperature and humidity by tracking signals received from a constellation of GNSS satellites. As radio waves pass through the atmosphere, they are refracted along the atmospheric path. The degree of refraction depends on gradients of air density, which in turn depend on temperature and water vapor. Therefore, measurement of the refracted angle contains information about these atmospheric variables. Since the measurements are made tangentially to the atmosphere, the profiles will be provided with a resolution within a few hundred meters to 1.5 kilometers. GRAS provides 500 precise atmospheric profiles every day, nearly equally distributed over the Earth's surface. GRAS can track up to eight satellites for navigation purposes and two additional satellites for both rise and set occultation measurements. The GRAS Level 1b product contains profiles of the bending angle over impact parameter and auxiliary information. GRAS Level-1b products are produced by the European Organization for Meteorological Satellites (EUMETSAT) and distributed by NOAA's Comprehensive Large Array-Data Stewardship System (CLASS) in the EPS Native Format. The main objectives are to provide stratospheric and tropospheric temperature and humidity profiles that will be assimilated into Numerical Weather Prediction (NWP) models. In addition GRAS provides navigation solutions of the MetOp satellite position along its orbit. onGoing NOAA National Centers for Environmental Information Customer Engagement Branch 1-828-271-4800 1-828-271-4876 151 Patton Avenue Veach-Baley Federal Building, Room 468 Asheville NC 28801-5001 USA ncei.orders@noaa.gov https://www.ncei.noaa.gov HTTPS Web Browser NOAA National Centers for Environmental Information (NCEI) NCEI home page with information, data access and contact information. information 8:00 - 6:00 Eastern pointOfContact asNeeded Earth Science > Spectral/Engineering > Radio Wave Earth Science > Atmosphere > Atmospheric Water Vapor > Water Vapor Profiles Earth Science > Atmosphere > Atmospheric Temperature > Upper Air Temperature theme Global Change Master Directory (GCMD) Science Keywords 2018-03-15 revision Version 8.6 Vertical Location > Troposphere Vertical Location > Stratosphere stratum Global Change Master Directory (GCMD) Stratum Keywords 2018-03-15 revision Version 8.6 NOAA OneStop project Global Change Master Directory (GCMD) Project Keywords 2018-03-15 revision Version 8.6 GRAS > Global navigation satellite system Receiver for Atmospheric Sounding instrument Global Change Master Directory (GCMD) Instrument Keywords 2018-03-15 revision Version 8.6 METOP-A > Meteorological Operational Satellite - A METOP-B > Meteorological Operational Satellite - B METOP-C > Meteorological Operational Satellite - C platform Global Change Master Directory (GCMD) Platform Keywords 2018-03-15 revision Version 8.6 gov.noaa.class:GRAS other Global Change Master Directory (GCMD) Other Keywords 2018-03-15 revision Version 8.6 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords HTTPS Web Browser Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher otherRestrictions Cite as: EUMETSAT (2007). MetOp Series Global Navigation Satellite System Receiver for Atmospheric Sounding (GRAS) Level 1B Data. [indicate subset used]. NOAA National Centers for Environmental Information. [access date]. otherRestrictions Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives. otherRestrictions Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose. GRAS - Metop's GPS-Based Atmospheric Sounder 2000-05-01 publication 102 European Space Agency publisher https://www.romsaf.org/Publications/reports/102_GRAS_Loiselet102.pdf HTTPS Web Browser GRAS - Metop's GPS-Based Atmospheric Sounder M. Loiselet, N. Stricker & Y. Menard Earth Observation Programmes Development Department, ESA Directorate of Applications Programmes, ESTEC, Noordwijk, The Netherlands J.-P. Luntama Eumetsat, Darmstad information crossReference sciencePaper eng; USA climatologyMeteorologyAtmosphere 1 -180.0 180.0 -90.0 90.0 ground condition 2007-09-14 NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact NCEI Contact Information Information for contacts at NCEI. information distributor In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media. Contact NCEI for other distribution options and instructions. EPS https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.ncdc:C01371/html HTTPS Landing Page NCEI Dataset Landing Page Landing page for the dataset. information 1 https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.ncdc%3AC01371/html HTTPS Description Global Navigation Satellite System Receiver for Atmospheric Sounding (GRAS) Level 1B Data Landing Page Dataset landing page with general information and access links for the dataset. information 1 http://www.class.noaa.gov/saa/products/search?sub_id=0&datatype_family=GRAS HTTP Data Search Application NOAA Comprehensive Large Array-data Stewardship System (CLASS) Data Search and Order Search the data archive and submit an order for the dataset via the interface. order dataset The Level 1b processing function performs occultation isolation to combine GRAS data for each occultation with the auxiliary data required to retrieve the bending angle profile. The pivot GPS satellite and the fiducial station supporting differencing schemes (for clock correction) have to be selected before all auxiliary data for each occultation can be filtered. European Meteorological Satellite Organisation processor EPS Programme GRAS Level 1 Product Generation Function Specification 2004-07-16 publication European Meteorological Satellite Organisation https://www.eumetsat.int/media/36733 HTTPS Web Browser EPS Programme GRAS Level 1 Product Generation Function Specification Product Specification Document information publisher https://www.eumetsat.int/media/38676 HTTPS Web Browser EPS Programme GRAS Level 1 Product Format Specification Product Specification Document information repository NOAA National Centers for Environmental Information NOAA created the National Centers for Environmental Information (NCEI) by merging NOAA's National Climatic Data Center (NCDC), National Geophysical Data Center (NGDC), and National Oceanographic Data Center (NODC), including the National Coastal Data Development Center (NCDDC), per the Consolidated and Further Continuing Appropriations Act, 2015, Public Law 113-235. NCEI launched publicly on April 22, 2015. 2015-04-22T00:00:00 asNeeded Bulk metadata change applied on 2023-06-23. See version control repository history for metadata change details.