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The "MARMOTTA-584/UserDocumentation" page has been changed by Francisco Sumba: https://wiki.apache.org/marmotta/MARMOTTA-584/UserDocumentation?action=diff&rev1=7&rev2=8 '''Sample Query''' {{{ + PREFIX geoes: <http://geo.marmotta.es/ontology#> + PREFIX geo: <http://www.opengis.net/ont/geosparql#> + PREFIX geof: <http://www.opengis.net/def/function/geosparql/> + + SELECT DISTINCT ?wkt ?wkt2 (geof:difference(?wkt,?wkt2) as ?difference) + WHERE { + ?class a <http://geo.marmotta.es/ontology#rio>. + ?class rdfs:label "Río Ebro" @es. + ?class geoes:hasExactGeometry ?geo. + ?geo geo:asWKT ?wkt. + + ?class2 a <http://geo.marmotta.es/ontology#rio>. + ?class2 rdfs:label "Río Matarraña" @es. + ?class2 geoes:hasExactGeometry ?geo2. + ?geo2 geo:asWKT ?wkt2. + } }}} + + As result of this query we get a geometric object that represents the difference among the rivers ''"Río Ebro"'' and ''"Río Matarraña"'' of Spain. In graphics you can see [[ https://en.wikipedia.org/wiki/Well-known_text#Geometric_Objects| WKT (Well Known text)]] drawn in open layers. + + || '''''?wkt'''''|| '''''?wkt2''''' || '''''?difference''''' || + || {{attachment:difference_wkt.png|?wkt|width=200}} || {{attachment:difference_wkt2.png|?convexHull|width=200}} || {{attachment:difference_difference.png|?convexHull|width=200}} || === Distance === === Envelope === === Intersection ===
