{"guid":"69af7956-ba3f-540e-affb-196f6eaed1f3","title":"Fortgeschrittene GIS-Analysen und Kartographie mit Geometrien-Ausdrücken in QGIS","subtitle":null,"slug":"fossgis2021-8926-fortgeschrittene-gis-analysen-und-kartographie-mit-geometrien-ausdrcken-in-qgis","link":"https://pretalx.com/fossgis2021/talk/RVXBRT/","description":"Geometrien per Ausdruck (bzw. \"Expression\") zu erzeugen, ermöglicht es in QGIS auch ohne tiefer gehende Programmierkenntnisse komplexe Berechnungen umzusetzen. Dieser Vortrag stellt die Funktion zunächst grundlegend vor und zeigt dann anhand einiger kleiner, praxisnaher Beispiele ihre Einsatzmöglichkeiten.\n\nGeometrien per Ausdruck (bzw. \"Expression\") zu erzeugen, ermöglicht es in QGIS auch ohne tiefer gehende Programmierkenntnisse komplexe Berechnungen umzusetzen.\n\nEs muss nicht immer gleich ein Plugin, ein Umstieg auf die Grafische Modellierung oder mühsame Handarbeit sein. Mit *Ausdrücken* lassen sich mehrstufige Geometrieprozessierungsschritte in wenige Zeilen Code umsetzen.\n\nDas Vorgehen ähnelt dabei einer sequenziellen, streng schrittweisen Ausrechnung: Berechne das, nimm das Ergebnis davon und tue damit dies, mit dem folgenden Ergebnis wiederum erzeuge jenes und so weiter.\n\nDieser Vortrag stellt die Funktion zunächst grundlegend vor und zeigt dann anhand einiger kleiner, praxisnaher Beispiele ihre Einsatzmöglichkeiten.","original_language":"deu","persons":["Johannes Kröger"],"view_count":278,"promoted":false,"date":"2021-06-09T12:00:00.000+02:00","release_date":"2021-06-09T00:00:00.000+02:00","updated_at":"2026-04-13T17:15:05.198+02:00","tags":["fossgis2021","8926","2021","Grundlagen Open-Source-GIS und OpenStreetMap","Geo","OpenStreeetMap","FOSS","Online"],"length":1611,"duration":1611,"thumb_url":"https://static.media.ccc.de/media/events/fossgis/2021/8926-69af7956-ba3f-540e-affb-196f6eaed1f3.jpg","poster_url":"https://static.media.ccc.de/media/events/fossgis/2021/8926-69af7956-ba3f-540e-affb-196f6eaed1f3_preview.jpg","timeline_url":"https://static.media.ccc.de/media/events/fossgis/2021/8926-69af7956-ba3f-540e-affb-196f6eaed1f3.timeline.jpg","thumbnails_url":"https://static.media.ccc.de/media/events/fossgis/2021/8926-69af7956-ba3f-540e-affb-196f6eaed1f3.thumbnails.vtt","frontend_link":"https://media.ccc.de/v/fossgis2021-8926-fortgeschrittene-gis-analysen-und-kartographie-mit-geometrien-ausdrcken-in-qgis","url":"https://api.media.ccc.de/public/events/69af7956-ba3f-540e-affb-196f6eaed1f3","conference_title":"FOSSGIS 2021","conference_url":"https://api.media.ccc.de/public/conferences/fossgis2021","related":[],"recordings":[{"size":131,"length":1611,"mime_type":"video/webm","language":"deu","filename":"fossgis2021-8926-deu-Fortgeschrittene_GIS-Analysen_und_Kartographie_mit_Geometrien-Ausdruecken_in_QGIS_webm-hd.webm","state":"new","folder":"webm-hd","high_quality":true,"width":1920,"height":1080,"updated_at":"2021-06-10T01:37:37.362+02:00","recording_url":"https://cdn.media.ccc.de/events/fossgis/2021/webm-hd/fossgis2021-8926-deu-Fortgeschrittene_GIS-Analysen_und_Kartographie_mit_Geometrien-Ausdruecken_in_QGIS_webm-hd.webm","url":"https://api.media.ccc.de/public/recordings/53923","event_url":"https://api.media.ccc.de/public/events/69af7956-ba3f-540e-affb-196f6eaed1f3","conference_url":"https://api.media.ccc.de/public/conferences/fossgis2021"},{"size":58,"length":1611,"mime_type":"video/webm","language":"deu","filename":"fossgis2021-8926-deu-Fortgeschrittene_GIS-Analysen_und_Kartographie_mit_Geometrien-Ausdruecken_in_QGIS_webm-sd.webm","state":"new","folder":"webm-sd","high_quality":false,"width":720,"height":576,"updated_at":"2021-06-10T01:00:05.256+02:00","recording_url":"https://cdn.media.ccc.de/events/fossgis/2021/webm-sd/fossgis2021-8926-deu-Fortgeschrittene_GIS-Analysen_und_Kartographie_mit_Geometrien-Ausdruecken_in_QGIS_webm-sd.webm","url":"https://api.media.ccc.de/public/recordings/53903","event_url":"https://api.media.ccc.de/public/events/69af7956-ba3f-540e-affb-196f6eaed1f3","conference_url":"https://api.media.ccc.de/public/conferences/fossgis2021"},{"size":14,"length":1601,"mime_type":"audio/opus","language":"deu","filename":"fossgis2021-8926-deu-Fortgeschrittene_GIS-Analysen_und_Kartographie_mit_Geometrien-Ausdruecken_in_QGIS_opus.opus","state":"new","folder":"opus","high_quality":false,"width":0,"height":0,"updated_at":"2021-06-10T00:50:32.203+02:00","recording_url":"https://cdn.media.ccc.de/events/fossgis/2021/opus/fossgis2021-8926-deu-Fortgeschrittene_GIS-Analysen_und_Kartographie_mit_Geometrien-Ausdruecken_in_QGIS_opus.opus","url":"https://api.media.ccc.de/public/recordings/53894","event_url":"https://api.media.ccc.de/public/events/69af7956-ba3f-540e-affb-196f6eaed1f3","conference_url":"https://api.media.ccc.de/public/conferences/fossgis2021"},{"size":46,"length":1611,"mime_type":"video/mp4","language":"deu","filename":"fossgis2021-8926-deu-Fortgeschrittene_GIS-Analysen_und_Kartographie_mit_Geometrien-Ausdruecken_in_QGIS_sd.mp4","state":"new","folder":"h264-sd","high_quality":false,"width":720,"height":576,"updated_at":"2021-06-10T00:49:33.187+02:00","recording_url":"https://cdn.media.ccc.de/events/fossgis/2021/h264-sd/fossgis2021-8926-deu-Fortgeschrittene_GIS-Analysen_und_Kartographie_mit_Geometrien-Ausdruecken_in_QGIS_sd.mp4","url":"https://api.media.ccc.de/public/recordings/53893","event_url":"https://api.media.ccc.de/public/events/69af7956-ba3f-540e-affb-196f6eaed1f3","conference_url":"https://api.media.ccc.de/public/conferences/fossgis2021"},{"size":24,"length":1601,"mime_type":"audio/mpeg","language":"deu","filename":"fossgis2021-8926-deu-Fortgeschrittene_GIS-Analysen_und_Kartographie_mit_Geometrien-Ausdruecken_in_QGIS_mp3.mp3","state":"new","folder":"mp3","high_quality":false,"width":0,"height":0,"updated_at":"2021-06-10T00:42:32.245+02:00","recording_url":"https://cdn.media.ccc.de/events/fossgis/2021/mp3/fossgis2021-8926-deu-Fortgeschrittene_GIS-Analysen_und_Kartographie_mit_Geometrien-Ausdruecken_in_QGIS_mp3.mp3","url":"https://api.media.ccc.de/public/recordings/53891","event_url":"https://api.media.ccc.de/public/events/69af7956-ba3f-540e-affb-196f6eaed1f3","conference_url":"https://api.media.ccc.de/public/conferences/fossgis2021"},{"size":104,"length":1611,"mime_type":"video/mp4","language":"deu","filename":"fossgis2021-8926-deu-Fortgeschrittene_GIS-Analysen_und_Kartographie_mit_Geometrien-Ausdruecken_in_QGIS_hd.mp4","state":"new","folder":"h264-hd","high_quality":true,"width":1920,"height":1080,"updated_at":"2021-06-09T23:49:42.290+02:00","recording_url":"https://cdn.media.ccc.de/events/fossgis/2021/h264-hd/fossgis2021-8926-deu-Fortgeschrittene_GIS-Analysen_und_Kartographie_mit_Geometrien-Ausdruecken_in_QGIS_hd.mp4","url":"https://api.media.ccc.de/public/recordings/53842","event_url":"https://api.media.ccc.de/public/events/69af7956-ba3f-540e-affb-196f6eaed1f3","conference_url":"https://api.media.ccc.de/public/conferences/fossgis2021"}]}