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        <gmd:MD_DigitalTransferOptions>
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                <gmd:URL>https://www.datigeo-piem-download.it/direct/Geoportale/RegionePiemonte/Acqua/sogg_100.zip</gmd:URL>
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                <gmx:Anchor xlink:href="https://registry.geodati.gov.it/metadata-codelist/ProtocolValue/www-download">WWW:DOWNLOAD-1.0-http--download</gmx:Anchor>
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                <gmx:Anchor xlink:href="http://inspire.ec.europa.eu/metadata-codelist/SpatialDataServiceType/other">Altri servizi</gmx:Anchor>
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          </gmd:onLine>
          <gmd:onLine>
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                <gmd:URL>https://www.datigeo-piem-download.it/direct/Geoportale/RegionePiemonte/Acqua/Soggiacenza%20falda%20superficiale.pdf</gmd:URL>
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          <gmd:result>
            <gmd:DQ_ConformanceResult>
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                    <gmx:Anchor xlink:href="http://data.europa.eu/eli/reg/2010/1089">REGOLAMENTO (UE) N. 1089/2010 DELLA COMMISSIONE del 23 novembre 2010 recante attuazione della direttiva 2007/2/CE del Parlamento europeo e del Consiglio per quanto riguarda l'interoperabilità dei set di dati territoriali e dei servizi di dati territoriali</gmx:Anchor>
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                        <gco:Date>2010-12-08</gco:Date>
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        <gmd:DQ_AbsoluteExternalPositionalAccuracy>
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            <gmd:DQ_QuantitativeResult>
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                <gco:Record>
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            <gco:CharacterString>Per la realizzazione della carta della soggiacenza della falda superficiale del territorio di pianura della Regione Piemonte si è  operato attraverso una sottrazione tra queste due superfici rappresentate tramite apposito software da due file grid. Un grid è una matrice di celle quadrate in cui un valore numerico è assegnato ad ogni cella. Il valore unico (o “attributo del grid”) assegnato ad ogni cella deriva da un’elaborazione statistica condotta a partire da una base di dati caratterizzati da un sistema di coordinate x, y, z, in cui x e y sono le coordinate UTM e z rappresenta il valore della variabile da interpolare.

Gli shape file sono stati prodotti dal Dipartimento di Scienze dellea Terra dell'Università di Torino nell'ambito di una Convezione.

L’elaborazione è stata effettuata in ambiente GIS utilizzando come spaziatura della  griglia un valore di 30 metri. In questo modo, sono stati realizzati un grid per la quota topografica (partendo da un file DEM della Regione Piemonte con passo di 50 metri) e un grid del livello piezometrico. Una griglia di valori di soggiacenza è stata, quindi, ottenuta come differenza tra il grid della quota topografica e il grid della quota piezometrica. Tale matrice di valori di soggiacenza è stata quindi visualizzata sottoforma di shapefile a rappresentare a carta della soggiacenza con le seguenti classi di valori reali: 0 – 5 m; 5 – 10 m; 10 – 20 m; 20 – 50 m;  &gt; 50 m. Sono stati prodotti nel 2002, sono stati pubblicati dalla Regione nel 2005 nella pubblicazione dal titolo "Idrogeologia della pianura Piemontese" e non sono stati successivamente aggiornati.</gco:CharacterString>
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