@prefix dcat: . @prefix dct: . @prefix foaf: . @prefix gsp: . @prefix locn: . @prefix owl: . @prefix schema: . @prefix vcard: . @prefix xsd: . a schema:DataDownload, schema:Dataset, dcat:Dataset, dcat:Distribution, foaf:Document ; dct:bibliographicCitation "Read the documentation, GEM terms of use and how to cite: https://data.g-e-m.dk/guides. Please get in touch with the GEM secretariat if you need help to cite correctly." ; dct:description "Fractional cloud cover detected from a hemispheric optical camera on the ground using the algorithm by Wacker et al. (2015). An accompanying dataset of cloud cover maps is available as 'cloud cover map every 10 minutes.'. The maps are projected into geographical coordinates assuming the cloud layer elevation given in the column 'cloud_level'. This dataset is being developed in collaboration between ClimateBasis Disko and the Remote Sensing and Modeling Initiative. See https://anon.erda.au.dk/share_redirect/aiveepToLn/Remote%20Sensing%20and%20Modelling/RemoteSensingProducts/GEMClouds/Cloud%20processing.pdf for a more detailed description of the dataset." ; dct:identifier "https://data.g-e-m.dk/datasets/10.17897/TN24-A413" ; dct:issued "2026-05-20T13:16:53.712271"^^xsd:dateTime, "2026-05-20T16:13:54.749498"^^xsd:dateTime ; dct:modified "2026-05-20T16:13:54.742794"^^xsd:dateTime, "2026-05-20T16:13:54.745028"^^xsd:dateTime ; dct:publisher [ a foaf:Agent ; foaf:homepage ; foaf:name "Greenland Ecosystem Monitoring" ], [ a foaf:Agent ; foaf:homepage ; foaf:name "Greenland Ecosystem Monitoring" ] ; dct:spatial [ a dct:Location ; locn:geometry "POLYGON ((-53.5211 69.2527, -53.5211 69.2527, -53.5211 69.2527, -53.5211 69.2527))"^^gsp:wktLiteral ] ; dct:temporal [ a dct:PeriodOfTime ; dcat:endDate "2024-10-06"^^xsd:date ; dcat:startDate "2016-09-01"^^xsd:date ], [ a dct:PeriodOfTime ; dcat:endDate "2024-10-06"^^xsd:date ; dcat:startDate "2016-09-01"^^xsd:date ] ; dct:title "cloud cover fraction every 10 minutes" ; schema:about [ a schema:Thing ; schema:name "arctic-station" ] ; schema:citation "Read the documentation, GEM terms of use and how to cite: https://data.g-e-m.dk/guides. Please get in touch with the GEM secretariat if you need help to cite correctly." ; schema:creator [ a schema:Organization ; schema:contactPoint [ a schema:ContactPoint ; schema:contactType "customer service" ; schema:name "University of Copenhagen (UCPH - Partner 3)" ; schema:url "https://data.g-e-m.dk/datasets/10.17897/TN24-A413" ] ; schema:name "University of Copenhagen (UCPH - Partner 3)" ] ; schema:dateModified "2026-05-20T16:13:54.742794" ; schema:datePublished "2020-01-01", "2020-01-01T00:00:00" ; schema:description "Fractional cloud cover detected from a hemispheric optical camera on the ground using the algorithm by Wacker et al. (2015). An accompanying dataset of cloud cover maps is available as 'cloud cover map every 10 minutes.'. The maps are projected into geographical coordinates assuming the cloud layer elevation given in the column 'cloud_level'. This dataset is being developed in collaboration between ClimateBasis Disko and the Remote Sensing and Modeling Initiative. See https://anon.erda.au.dk/share_redirect/aiveepToLn/Remote%20Sensing%20and%20Modelling/RemoteSensingProducts/GEMClouds/Cloud%20processing.pdf for a more detailed description of the dataset." ; schema:distribution ; schema:identifier "https://data.g-e-m.dk/datasets/10.17897/TN24-A413" ; schema:keywords "ARCTIC", "CLIMATE INDICATORS", "ECOSYSTEMS", "GREENLAND", "IMAGERY-BASE MAPS-EARTH COVER", "MODELS" ; schema:license "https://creativecommons.org/licenses/by-sa/4.0/" ; schema:name "cloud cover fraction every 10 minutes" ; schema:publisher [ a schema:Organization ; schema:contactPoint [ a schema:ContactPoint ; schema:contactType "customer service" ; schema:name "Greenland Ecosystem Monitoring" ; schema:url "https://data.g-e-m.dk" ] ; schema:name "Greenland Ecosystem Monitoring" ] ; schema:spatialCoverage [ a schema:Place ; schema:geo [ a schema:GeoShape ; schema:polygon "{\"type\": \"Polygon\", \"coordinates\": [[[-53.52112579345703, 69.25269317626953], [-53.52112579345703, 69.25269317626953], [-53.52112579345703, 69.25269317626953], [-53.52112579345703, 69.25269317626953]]]}" ] ] ; schema:temporalCoverage "2016-09-01/2024-10-06" ; schema:url "https://data.g-e-m.dk/datasets/10.17897/TN24-A413" ; schema:variableMeasured [ a schema:PropertyValue ; schema:description "Cloud elevation a.s.l. assumed in the calculations." ; schema:name "cloud_level" ; schema:propertyID ; schema:unitText "M" ; schema:url ], [ a schema:PropertyValue ; schema:description "Unweighted fraction of pixels classified as cloudy forming a contiguous area and containing the calculated position of the sun." ; schema:name "sun_area" ; schema:propertyID ; schema:unitText "fraction" ; schema:url ], [ a schema:PropertyValue ; schema:description "Fraction of imaged area classified as cloudy." ; schema:name "weighted" ; schema:propertyID ; schema:unitText "fraction" ; schema:url ], [ a schema:PropertyValue ; schema:description "Fraction of pixels classified as cloudy." ; schema:name "unweighted" ; schema:propertyID ; schema:unitText "fraction" ; schema:url ], [ a schema:PropertyValue ; schema:description "Time of observation (UTC-3)" ; schema:name "Time" ; schema:propertyID ; schema:unitText "HH:MM" ; schema:url ], [ a schema:PropertyValue ; schema:description "Date of observation" ; schema:name "Date" ; schema:propertyID ; schema:unitText "YYYY-MM-DD" ; schema:url ] ; schema:version "1" ; owl:versionInfo "1" ; dcat:accessURL ; dcat:contactPoint [ a vcard:Organization ; vcard:fn "[{\"author_name\": \"Greenland Ecosystem Monitoring\"}]" ] ; dcat:distribution ; dcat:keyword "ARCTIC", "CLIMATE INDICATORS", "ECOSYSTEMS", "GREENLAND", "IMAGERY-BASE MAPS-EARTH COVER", "MODELS" ; dcat:landingPage ; dcat:theme "arctic-station" .