@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix gsp: <http://www.opengis.net/ont/geosparql#> .
@prefix locn: <http://www.w3.org/ns/locn#> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://data.amerigeoss.org/dataset/7f65b671-5c7b-4e8a-ba82-e9b3533144fc> a dcat:Dataset ;
    dct:description "This derived product set consists of Global Navigation Satellite System Final Ionosphere Vertical Total Electron Content (VTEC) product (daily files) from the NASA Crustal Dynamics Data Information System (CDDIS). The VTEC product files also include Delay Code Bias (DCB) values for GNSS satellites and ground receivers derived during the analysis. GNSS provide autonomous geo-spatial positioning with global coverage. GNSS data sets from ground receivers at the CDDIS consist primarily of the data from the U.S. Global Positioning System (GPS) and the Russian GLObal NAvigation Satellite System (GLONASS). Since 2011, the CDDIS GNSS archive includes data from other GNSS (Europe’s Galileo, China’s Beidou, Japan’s Quasi-Zenith Satellite System/QZSS, the Indian Regional Navigation Satellite System/IRNSS, and worldwide Satellite Based Augmentation Systems/SBASs), which are similar to the U.S. GPS in terms of the satellite constellation, orbits, and signal structure. GNSS observations from a global network can be utilized for atmospheric measurements. Analysis Centers (ACs) of the International GNSS Service (IGS) retrieve GNSS data on regular schedules to produce independently computed VTEC maps. The IGS Ionosphere Analysis Center Coordinator (ACC) uses these individual AC solutions to generate the official IGS VTEC maps. The final VTEC maps are computed with a resolution of 2 hours in UT, 5 degrees in longitude and 2.5 degrees in latitude; they have an availability with a latency of 11 days." ;
    dct:identifier "C1511761518-CDDIS" ;
    dct:issued "1998-01-01"^^xsd:date ;
    dct:language "{en-US}" ;
    dct:modified "2020-08-15"^^xsd:date ;
    dct:publisher <https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> ;
    dct:spatial [ a dct:Location ;
            locn:geometry "POLYGON ((-180.0000 -90.0000, 180.0000 -90.0000, 180.0000 90.0000, -180.0000 90.0000, -180.0000 -90.0000))"^^gsp:wktLiteral ] ;
    dct:title "Global Navigation Satellite System (GNSS) Ionosphere Vertical Total Electron Content (VTEC) Final Product from NASA CDDIS" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "undefined" ;
            vcard:hasEmail <mailto:support-cddis@earthdata.nasa.gov> ] ;
    dcat:distribution <https://data.amerigeoss.org/dataset/7f65b671-5c7b-4e8a-ba82-e9b3533144fc/resource/23391120-d5c9-4620-9b74-9fac03de4555>,
        <https://data.amerigeoss.org/dataset/7f65b671-5c7b-4e8a-ba82-e9b3533144fc/resource/6c831186-36ec-411b-94f6-5c47a3c6953f>,
        <https://data.amerigeoss.org/dataset/7f65b671-5c7b-4e8a-ba82-e9b3533144fc/resource/9bf8b7e7-f642-4dfd-a728-96080e8e248b>,
        <https://data.amerigeoss.org/dataset/7f65b671-5c7b-4e8a-ba82-e9b3533144fc/resource/fbefa137-d36b-4c69-b5e5-18c9168af2f4> ;
    dcat:keyword "amerigeo",
        "amerigeoss",
        "ckan",
        "earth-science",
        "geo",
        "geodetics",
        "geoss",
        "gravity-gravitational-field",
        "national",
        "north-america",
        "solid-earth",
        "tectonics",
        "united-states" ;
    dcat:theme <%7BIGS>,
        <geospatial%7D> .

<https://data.amerigeoss.org/dataset/7f65b671-5c7b-4e8a-ba82-e9b3533144fc/resource/23391120-d5c9-4620-9b74-9fac03de4555> a dcat:Distribution ;
    dct:description "Search results for publications that cite this dataset by its DOI." ;
    dct:format "HTML" ;
    dct:issued "2020-11-12T04:04:24.360278"^^xsd:dateTime ;
    dct:modified "2025-11-22T23:27:11.608551"^^xsd:dateTime ;
    dct:title "Google Scholar search results" ;
    dcat:accessURL <https://scholar.google.com/scholar?q=10.5067%2FGNSS%2FGNSS_IGSIONOTEC_001> ;
    dcat:mediaType "text/html" .

<https://data.amerigeoss.org/dataset/7f65b671-5c7b-4e8a-ba82-e9b3533144fc/resource/6c831186-36ec-411b-94f6-5c47a3c6953f> a dcat:Distribution ;
    dct:description "URL for more information about GNSS derived products" ;
    dct:format "HTML" ;
    dct:issued "2020-11-12T04:04:24.360299"^^xsd:dateTime ;
    dct:modified "2025-11-22T23:27:11.609861"^^xsd:dateTime ;
    dct:title "This dataset's landing page" ;
    dcat:accessURL <http://dx.doi.org/10.5067/GNSS/GNSS_IGSIONOTEC_001> ;
    dcat:mediaType "text/html" .

<https://data.amerigeoss.org/dataset/7f65b671-5c7b-4e8a-ba82-e9b3533144fc/resource/9bf8b7e7-f642-4dfd-a728-96080e8e248b> a dcat:Distribution ;
    dct:description "URL for more information about GNSS derived products" ;
    dct:format "HTML" ;
    dct:issued "2020-11-12T04:04:24.360293"^^xsd:dateTime ;
    dct:modified "2025-11-22T23:27:11.609444"^^xsd:dateTime ;
    dct:title "View documentation related to this dataset" ;
    dcat:accessURL <https://cddis.nasa.gov/Data_and_Derived_Products/GNSS/GNSS_product_holdings.html> ;
    dcat:mediaType "text/html" .

<https://data.amerigeoss.org/dataset/7f65b671-5c7b-4e8a-ba82-e9b3533144fc/resource/fbefa137-d36b-4c69-b5e5-18c9168af2f4> a dcat:Distribution ;
    dct:description "URL for retrieval of GNSS derived products through ftp" ;
    dct:format "HTML" ;
    dct:issued "2020-11-12T04:04:24.360288"^^xsd:dateTime ;
    dct:modified "2025-11-22T23:27:11.609030"^^xsd:dateTime ;
    dct:title "Download this dataset" ;
    dcat:accessURL <ftp://cddis.nasa.gov/gnss/products> ;
    dcat:mediaType "text/html" .

<https://data.amerigeoss.org/organization/727dbdd5-3f98-4ac0-9d28-5e344558139b> a foaf:Agent ;
    foaf:name "US Migrating" .