Ground-Based Global Positioning System (GPS) Meteorology Integrated Precipitable Water Vapor (IPW)


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        citation:  (CI_Citation)
            title:  Ground-Based Global Positioning System (GPS) Meteorology Integrated Precipitable Water Vapor (IPW)
            alternateTitle:  gpsmet
            date:  (CI_Date)
                date:  2002-04-01
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                  Anchor:  DOI doi:10.7289/V5DR2SHD
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                code:  NCEI DSI 5909_01
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                code:  gov.noaa.ncdc:C00962
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                individualName:  Holub, Kirk
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                individualName:  Gutman, Seth
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        abstract:  The Ground-Based Global Positioning System (GPS) Meteorology Integrated Precipitable Water Vapor (IPW) data set measures atmospheric water vapor using ground-based GPS receivers. The data contain observations from several hundred locations around the globe every 30 minutes from 2002-05-01 to present. However, most locations lie within the continental United States. The data set was formed in response to the need for improved moisture observations to support weather forecasting, climate monitoring, and research. The data set contains total precipitable water estimates, GPS total signal delay, GPS hydrostatic signal delay, GPS wet signal delay, surface temperature, surface pressure, mean-weighted surface temperature, and the wet delay mapping function. The GPS-IPW network processes data from both NOAA and other agency CORS (Continuously Operating Reference Sites) sites. All sites are equipped with a GPS receiver and many are equipped with a surface meteorological instrumentation package. GPS satellite observation are combined with GPS satellite orbit and earth orientation parameters to estimate GPS signal delay (Zenith Total Delay -- ZTD). Signal delays are then combined with surface meteorological information are used to estimate total precipitable water. For sites without surface meteorology sensors, data from nearby ASOS (Automated Surface Observing System) systems were used. Data set variables and their resolution: total precipitable water; 0.001 m, GPS total signal delay; 0.001m, GPS hydrostatic signal delay; 0.001m, GPS wet signal delay; 0.001m, surface temperature; 0.1 K, surface pressure; 0.1 hpa, mean-weighted surface temperature; 0.1 K, wet delay mapping function; 0.1 (dimensionless). Late updated in November 2016 with no plans for updating at this time due to funding.
        purpose:  The primary uses for the data set are to demonstrate the major aspects of an operational GPS integrated precipitable water vapor (IPW) monitoring system, facilitate assessments of the impact of these data on weather forecasts, assist in the transition of these techniques to operational use, and encourage the use of GPS meteorology for atmospheric research and other applications.
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            fileDescription:  A 30 day time series of integrated precipitable water vapor (IPW) estimated at Boulder, CO and Blacksburg, VA
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            useLimitation:  There are no known limitations to the dataset's usability. The system is all-weather; limited only by power at and communications with the CORS sites.
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            otherConstraints:  Cite this dataset when used as a source: Holub, Kirk L. and Gutman, Seth I. (2016):Ground-Based Global Positioning System (GPS) Meteorology, Version 1.0. NOAA National Centers for Environmental Information (NCEI). doi:10.7289/V5DR2SHD [access date].
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            otherConstraints:  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.
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                title:  Rapid Retrieval and Assimilation of Ground Based GPS Precipitable Water Observations at the NOAA Forecast Systems Laboratory: Impact on Weather Forecasts
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                    date:  2004-04-30
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                    code: http://doi.org/10.2151/jmsj.2004.351
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                    organisationName:  Meteorological Society of Japan
                    role:  (CI_RoleCode) publisher
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                            linkage: https://www.jstage.jst.go.jp/article/jmsj/82/1B/82_1B_351/_pdf
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                            name:  Rapid Retrieval and Assimilation of Ground Based GPS Precipitable Water Observations at the NOAA Forecast Systems Laboratory: Impact on Weather Forecasts
                            description:  Science paper describing the processing of the data.
                            function:  (CI_OnLineFunctionCode) information
                    role: (missing)
            associationType:  (DS_AssociationTypeCode) source
            initiativeType:  (DS_InitiativeTypeCode) sciencePaper
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            distance:
              Distance:  10000
        language:  eng; USA
        topicCategory:  (MD_TopicCategoryCode) climatologyMeteorologyAtmosphere
        environmentDescription:  The network is controlled by a software system developed by ESRL/GSD in conjunction with the Scripps Institution of Oceanography (SIO) and the University of Hawaii at Manoa (UH). GPS precise predicted orbits from Scripps Orbit and Permanent Array Center (SOPAC) and data from individual sites (GPS and MET) are continuously downloaded by a server. At the beginning of a processing cycle, several processing nodes download the GPS data and predicted orbits for selected sites from the server. The GAMIT (GPS at MIT [http://www-gpsg.mit.edu/~simon/gtgk]) software package provided by the Massachusetts Institute of Technology (MIT) processes this data and produces Tropospheric Signal Delay (ZTD) values (illustrated below.) These values are then processed with Meteorology data from the sites to produce and Integrated Precipitable Water Values (IPW) which are then distributed to interested parties and made available online. The processing system incorporates an 8 hour sliding window technique, with two processing cycles for each hour starting at 02 and 32 minutes after the hour. Each cycle produces 16 individual IPW for each half hour within the sliding window. As the 8 hour sliding window progresses throughout the day, more IPW are produced for each half hour until that particular half hour is no longer within the sliding window. This produces a possibility of 16 values for each half hour. Within each half hour, two IPW are available, a first guess and median value. The first guess IPW is the first value for the half hour meeting the quality control criteria. The median IPW is the median of all results for that particular half hour. This result can be the median of 1 to 16 values depending upon quality control criteria.
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                westBoundLongitude:  -180.0
                eastBoundLongitude:  180.0
                southBoundLatitude:  -90.0
                northBoundLatitude:  90.0
            temporalElement:  (EX_TemporalExtent)
                extent:
                  TimePeriod:
                    description:  ground condition
                    beginPosition:  2002-04-01
                    endPosition:  2016-11-29
                    timeInterval:  30
        supplementalInformation:  The near real-time estimates of IPW have a resolution is 30 minutes. They are based on GPS signal delay estimates and surface pressure and temperature observations.
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    distributionInfo:  (MD_Distribution)
        distributor:  (MD_Distributor)
            distributorContact:  (CI_ResponsibleParty)
                organisationName:  DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
                positionName:  Customer Engagement Branch
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                        voice:  1-828-271-4800
                        facsimile:  1-828-271-4876
                    address:  (CI_Address)
                        deliveryPoint:  151 Patton Avenue
                        deliveryPoint:  Veach-Baley Federal Building, Room 468
                        city:  Asheville
                        administrativeArea:  NC
                        postalCode:  28801-5001
                        country:  USA
                        electronicMailAddress:  ncei.orders@noaa.gov
                    onlineResource:  (CI_OnlineResource)
                        linkage: https://www.ncei.noaa.gov
                        protocol:  HTTPS
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                        name:  NOAA National Centers for Environmental Information (NCEI)
                        description:  NCEI home page with information, data access and contact information.
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                fees:  In most cases, electronic downloads of the data are free, however fees may apply for data certifications, copies of analog materials, and data distribution on physical media.
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                    linkage: https://data.nodc.noaa.gov/cgi-bin/iso?id=gov.noaa.ncdc:C00962
                    protocol:  HTTPS
                    applicationProfile:  Description
                    name:  Ground-Based Global Positioning System (GPS) Meteorology Integrated Precipitable Water Vapor (IPW) Landing Page
                    description:  Dataset landing page with general information and access links for the dataset.
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            distributorContact:  (CI_ResponsibleParty)
                organisationName:  DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
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                        voice:  1-828-271-4800
                        facsimile:  1-828-271-4876
                    address:  (CI_Address)
                        deliveryPoint:  151 Patton Avenue
                        deliveryPoint:  Veach-Baley Federal Building, Room 468
                        city:  Asheville
                        administrativeArea:  NC
                        postalCode:  28801-5001
                        country:  USA
                        electronicMailAddress:  ncei.orders@noaa.gov
                    onlineResource:  (CI_OnlineResource)
                        linkage: https://www.ncei.noaa.gov
                        protocol:  HTTPS
                        applicationProfile:  Web Browser
                        name:  NOAA National Centers for Environmental Information (NCEI)
                        description:  NCEI home page with information, data access and contact information.
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                    hoursOfService:  8:00 - 6:00 Eastern
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                fees:  In most cases, electronic downloads of the data are free, however fees may apply for data certifications, copies of analog materials, and data distribution on physical media.
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                version: (missing)
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                    linkage: https://www.ncei.noaa.gov/data/gpsmet/
                    protocol:  HTTPS
                    applicationProfile:  Download
                    name:  NOAA NCEI website for ESRL Ground-Based GPS Meteorology data
                    description:  NCEI website for downloading ESRL Ground-Based GPS Meteorology data
                    function:  (CI_OnLineFunctionCode) download
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    dataQualityInfo:  (DQ_DataQuality)
        scope:  (DQ_Scope)
            level:  (MD_ScopeCode) dataset
            extent:  #boundingExtent
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            statement:  The purpose of the National Oceanic and Atmospheric Administration's (NOAA) Ground-Based GPS-IPW project (gpsmet) was to: Evaluate the engineering and scientific bases of surface-based GPS meteorology; demonstrate the feasibility and utility of using surface-based GPS observations for improved weather forecasting, climate monitoring, and satellite sensor calibration/validation; transfer this observing system technology to operational use. The Global Systems Division (GSD) Demonstration Branch (DB) (now Global Systems Division [GSD]) established the world's first GPS network dedicated to atmospheric remote sensing in 1994. This project was a collaboration between NOAA Research and several organizations and institutions including: NOAA's National Geodetic Survey (NGS) which manages the network of Continuously Operating Reference Stations (CORS); including some of the GSD/DB GPS-IPW network sites, NOAA's National Data Buoy Center (NDBC), The U.S. Department of Transportation Federal Highway Administration (DOT), The U.S. Coast Guard (USCG) International GPS Service (IGS) which maintains global network of tracking sites; including some of the GSD/DB GPS-IPW network sites, Scripps Institution of Oceanography (SIO) University of Hawaii at Manoa (UHhttp://lumahai.soest.hawaii.edu/Dept/meteorology/index.html), UNAVCO (UNAVCO) The Department of Energy Atmospheric Radiation Measurement (ARM) Program. All processing software and products used or created by the gpsmet processing system reside on GSD systems or at NCEI archives.
            processStep:  (LE_ProcessStep)
                description:  Estimation of IPW required two components; an estimate of ZTD and observations of the surface pressure and temperature. Estimation of ZTD began the acquiring GPS observation data from a collection of GPS CORS sites. These observations were used as inputs, along with earth orientation parameters (OEP) and internal terrestrial reference frame (ITRF) parameters, by GAMIT to estimate ZTD. Once ZTD had been estimated it separated into two components, wet and dry, using surface meteorological data. In the final step IPW was estimated by applying an empirical mapping parameter to the the estimated wet component.
                rationale:  Estimation of IPW required two components; an estimate of ZTD and observations of the surface pressure and temperature. ZTD cannot be directly observed by the GPS receivers. It must be obtained by processing the GPS observations.
                dateTime: (missing)
                processor:  (CI_ResponsibleParty)
                    organisationName:  DOC/NOAA/OAR/ESRL/GSD/ > Global Systems Division, Earth System Research Laboratory, OAR, NOAA, U.S. Department of Commerce
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                source:  sd001
                source:  sd002
                processingInformation:  (LE_Processing)
                    identifier:  (MD_Identifier)
                        code:  gpsmet processing system
                    algorithm:  (LE_Algorithm)
                        citation:  (CI_Citation)
                            title:  A NEW COMPOSITE OBSERVING SYSTEM STRATEGY FOR GROUND-BASED GPS METEOROLOGY
                            date:  (CI_Date)
                                date:  2003-02-11
                                dateType:  (CI_DateTypeCode) publication
                            citedResponsibleParty:  (CI_ResponsibleParty)
                                organisationName:  DOC/NOAA/OAR/ESRL/GSD/ > Global Systems Division, Earth System Research Laboratory, OAR, NOAA, U.S. Department of Commerce
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                                organisationName: (missing)
                                contactInfo:  (CI_Contact)
                                    onlineResource:  (CI_OnlineResource)
                                        linkage: https://ams.confex.com/ams/pdfpapers/54168.pdf
                                        protocol:  HTTPS
                                        applicationProfile:  Web Browser
                                        name:  A NEW COMPOSITE OBSERVING SYSTEM STRATEGY FOR GROUND-BASED GPS METEOROLOGY
                                        description:  Presented at AMS 12th Symposium on Meteorological Observations and Instrumentation
                                        function:  (CI_OnLineFunctionCode) information
                                role: (missing)
                        description:  See Algorithm Citation
            source:  (LE_Source)
                description:  GPS carrier phase observations
                sourceCitation:  (CI_Citation)
                    title:  GPS carrier phase observation
                    date:  (CI_Date)
                        date:  1994-01-01
                        dateType:  (CI_DateTypeCode) publication
                    citedResponsibleParty:  (CI_ResponsibleParty)
                        organisationName:  DOC/NOAA/NOS > National Ocean Service, NOAA, U.S. Department of Commerce
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                            onlineResource:  (CI_OnlineResource)
                                linkage: http://www.ngs.noaa.gov/CORS
                                applicationProfile:  Web Browser
                                name:  GPS carrier phase observation
                                description:  GPS observation data
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                        westBoundLongitude:  180
                        eastBoundLongitude:  180
                        southBoundLatitude:  90
                        northBoundLatitude:  90
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                            beginPosition:  2002-04-01
                            endPosition:  2016-11-29
                sourceStep:  ps001
            source:  (LE_Source)
                description:  Meteorological observations
                sourceCitation:  (CI_Citation)
                    title:  surface meteorological observations
                    date: (missing)
                    citedResponsibleParty:  (CI_ResponsibleParty)
                        organisationName:  DOT/FAA
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                        organisationName: (missing)
                        contactInfo:  (CI_Contact)
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                                linkage: http://aviationweather.gov/adds/dataserver_current/current/
                                applicationProfile:  Web Browser
                                name:  surface meteorological observations
                                description:  surface meteorological observation from ASOS sites
                                function:  (CI_OnLineFunctionCode) information
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                sourceExtent:  (EX_Extent)
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                        westBoundLongitude:  180
                        eastBoundLongitude:  180
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                        northBoundLatitude:  90
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                          TimePeriod:
                            beginPosition:  gco:nilReason="missing"/
                            endPosition:  2016-11-29
                sourceStep:  ps001
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    dataQualityInfo:  (DQ_DataQuality)
        scope:  (DQ_Scope)
            level:  (MD_ScopeCode) repository
            levelDescription:  (MD_ScopeDescription)
                other:  NOAA National Centers for Environmental Information
        lineage:  (LI_Lineage)
            processStep:  (LE_ProcessStep)
                description:  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.
                dateTime:
                  DateTime:  2015-04-22T00:00:00
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    metadataMaintenance:  (MD_MaintenanceInformation)
        maintenanceAndUpdateFrequency:  (MD_MaintenanceFrequencyCode) asNeeded
        maintenanceNote:  Bulk metadata change applied on 2018-05-25. See version control repository history for metadata change details.