@prefix dcat: . @prefix dct: . @prefix epsg: . @prefix foaf: . @prefix gsp: . @prefix locn: . @prefix rdf: . @prefix rdfs: . @prefix schema1: . @prefix skos: . @prefix vcard: . @prefix xsd: . a dcat:Dataset ; dct:accrualPeriodicity "Other" ; dct:conformsTo epsg:3857, "See the referenced specification" ; dct:created "2024-08-27T12:56:29"^^xsd:dateTime ; dct:description "A Sub-bottom profile aims to identify and characterise layers of sediment or rock under the seabed. These systems also can be helpful in locating hard objects buried beneath the seabed shallow sediment layers. In sub-bottom profiling, a sound source directs a pulse toward the seabed. Parts of this sound pulse reflect off of the seabed, while other parts penetrate the seabed. The portions of the sound pulse that penetrate the seabed are both reflected and refracted as they pass into different layers of sediment. Sub-bottom profile data can be collected by 2 systems a Pinger, a Chirp system or a Sparker system. The Pinger/Chirp systems operate in a similar way to the SBES but at lower frequencies. A pinger system transmits a single frequency (~4 kHz) while the chirp system transmits a sweep of frequencies (e.g. 2-7 kHz) in a single pulse. The sound penetrates the seabed and reflects off boundaries where there are changes in the sediment properties (e.g. mud-sand transitions). The depth of penetration into the subsurface is dependent on the type of sediment. The Sparker system is used sub-seabed investigations where deeper penetration is required or coarse/ compacted sediments dominate. Operating at lower frequencies (500 – 2000 Hz) the unit is towed behind the vessel, transmitting a more powerful pulse of sound into the seabed. None"@en ; dct:identifier "67d03be3-d7b0-439e-904b-02703a8031c7" ; dct:issued "2017-11-09"^^xsd:date ; dct:language ; dct:modified "2026-04-01T18:24:06"^^xsd:dateTime ; dct:provenance "Data supplied by Marine Institute." ; dct:publisher ; dct:rights [ a dct:RightsStatement ; skos:prefLabel "{\"While every effort is made in preparing the dataset no responsibility is accepted by or on behalf of the Marine Institute for any errors, omissions or misleading information. The Marine Institute accepts no responsibility for loss or damage occasioned or claimed to have been occasioned, in part or in full, as a consequence of any person acting, or refraining from acting as a result of a matter contained in this datasets or as a consequence of using this dataset for any purpose whatsoever.\",\"A Creative Commons (CC) license is one of several public copyright licenses that enable the free distribution of an otherwise copyrighted work. A CC license is used when an author wants to give people the right to share, use, and build upon a work that they have created. Under Creative Commons CC BY 4.0 the following is granted: Rights Share — copy and redistribute the material in any medium or format; Adapt — remix, transform, and build upon the material for any purpose, even commercially. The licensor cannot revoke these freedoms as long as you follow the license terms. Requirements Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.\",CC%20BY%204.0}" ] ; dct:spatial [ a dct:Location ; locn:geometry "POLYGON ((-25.0000 46.8000, -25.0000 57.4000, -5.3000 57.4000, -5.3000 46.8000, -25.0000 46.8000))"^^gsp:wktLiteral, "{\"type\":\"Polygon\",\"coordinates\":[[[-25.0, 46.8],[-25.0, 57.4], [-5.3, 57.4], [-5.3, 46.8], [-25.0, 46.8]]]}"^^ ] ; dct:temporal [ a dct:PeriodOfTime ; dcat:startDate "1996-01-01"^^xsd:date ], [ a dct:PeriodOfTime ; schema1:startDate "1996-01-01"^^xsd:date ] ; dct:title "INFOMAR Sub-bottom Profile" ; dcat:contactPoint [ a vcard:Organization ; vcard:fn "Geological Survey of Ireland" ; vcard:hasEmail ] ; dcat:distribution , , , ; dcat:keyword "environment" ; dcat:theme , . a dct:LinguisticSystem . a dcat:Distribution ; dct:description "GSI Home Page" ; dct:issued "2026-04-01T18:24:06"^^xsd:dateTime ; dct:modified "2026-04-01T18:24:06"^^xsd:dateTime ; dct:title "GSI Home Page" ; dcat:accessURL ; dcat:downloadURL . a dcat:Distribution ; dct:description "available as HTML" ; dct:format [ a dct:MediaTypeOrExtent ; rdfs:label "HTML" ; rdf:value "HTML" ] ; dct:issued "2026-04-01T18:24:06"^^xsd:dateTime ; dct:modified "2026-04-01T18:24:06"^^xsd:dateTime ; dct:title "Organisation Home Page" ; dcat:accessURL . a dcat:Distribution ; dct:description "available as HTML" ; dct:format [ a dct:MediaTypeOrExtent ; rdfs:label "HTML" ; rdf:value "HTML" ] ; dct:issued "2026-04-01T18:24:06"^^xsd:dateTime ; dct:modified "2026-04-01T18:24:06"^^xsd:dateTime ; dct:title "Organisation Home Page" ; dcat:accessURL . a dcat:Distribution ; dct:description "available as HTML" ; dct:format [ a dct:MediaTypeOrExtent ; rdfs:label "HTML" ; rdf:value "HTML" ] ; dct:issued "2026-04-01T18:24:06"^^xsd:dateTime ; dct:modified "2026-04-01T18:24:06"^^xsd:dateTime ; dct:title "HTML" ; dcat:accessURL . a foaf:Agent, foaf:Organization ; foaf:name "Geological Survey Ireland" .