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Thomas Mönkemeier, B.Eng.
Humboldt-Universität zu Berlin
Wie komme ich mit
WFS an Geodaten?
WFS-Geodaten-Katalog
mit Crowdsourcing
2
Welche Geodaten?
● Vektor
– Geometrien und Attribute
– Wichtig für Forschung
mit GIS-Methoden
Heute nicht betrachtet:
● Raster
● Bilder
● Tabellen
● Interviews
● ...
3
Früher: Geodaten-Bezug
● Weitergabe auf Datenträgern
● Suche nach Geodaten auf Webseiten
verschiedener Anbieter
● Download gepackter
Shapefiles
● Diverse Koordinaten-
Bezugssysteme
● Zeichensätze
„Am Anfang und am Ende
der GIS-Karriere
steht das Shapefile.“
4
Heute: Geodaten-Bezug
●
OGC = Open Geospatial Consortium
– Gemeinnützige Organisation, W3C-Mitglied
– Allgemeingültige Standards zum Zweck der Interoperabilität
– Mitglieder: Regierungsorganisationen, Industrie und Universitäten
●
WFS = Web Feature Service
– Aktueller Standard für Geometrien mit Attributen und Metadaten
●
GeoServer
– Referenz-Implementierung des OGC-Standards WFS, open source
– Früher „Free Feature Server“, einfache Lösung für Geodaten als WFS
5
Geodaten-Zugriff mit WFS
● QGIS: WFS seit langem implementiert
– WFS 2.0 als Plugin
● ArcGIS: „WFS to Featureclass“
– Ab ArcMap 10.3, teilweise Kompatibiltätsprobleme
– ESRI konservativ mit Implementierung offener Standards
● R mit GDAL: Library „rgdal“, z.B.
– ogrListLayers("WFS:http://maps.geo.hu-berlin.de/geoserver/wfs")
– Geometrien und Attribute direkt in SpatialDataFrame laden
● Erforderlich: „GetCapabilities“-URL
6
Quellen für WFS-Geodaten
● Diverse Geoportale, GDI
– Autoritäre Zusammenstellung der Dienste einer Peer-Group
– Durchmischung mit WMS und anderen Diensten
● WFS Geodata Catalog (Server-Komponente)
– http://wfs.geoclub.de/ - open source bei GitHub
– Entwickelt für Geographisches Institut, HU Berlin
– Website mit Datenbank für offene WFS-Layer
– Crowdsourced durch WFS-Downloader, P2P-Netzwerk geplant
● Google „inurl:wfs inurl:getcapabilities“
● Nutzungsrechte beachten!
7
●
WFS Geodata Catalog
Stichwortsuche im
WFS Geodata Catalog
in den Metadaten
der WFS-Layer
Nutzungsbedingungen
und -entgelte beachten!
8
WFS-Downloader (Client-Komponente)
● Speichert
WFS-Layer
als Shapefile
● Triviales
Werkzeug
● Windows 7+
● Open Source
auf GitHub
● Benötigt GDAL
● Crowdsourcing
9
Crowdsourcing
● Layer-Abfrage im „crowd mode“
über Server optional
● Bereits bekannte Services als
Dropdown-Liste
● Einmal verwendete Services
als Layer automatisch in
Katalog ergänzt
● API für Client/Server:
Eingabe: URL (encoded)
Ausgabe: Layerliste (ASCII)
● P2P: „ping“ Peer-Liste
10
QGIS WFS Connections Export
●
Export
XML-Datei
für QGIS
11
Was nun?
● Katalog ausprobieren:
http://wfs.geoclub.de/
– WFS-Downloader auch dort
– Eigener WFS-Katalog
mit Peering?
● Kontakt:
moenkemt@geo.hu-berlin.de
● Noch Fragen?

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GISDay 2015: WFS Geodaten Katalog mit Crowdsourcing

  • 1. Thomas Mönkemeier, B.Eng. Humboldt-Universität zu Berlin Wie komme ich mit WFS an Geodaten? WFS-Geodaten-Katalog mit Crowdsourcing
  • 2. 2 Welche Geodaten? ● Vektor – Geometrien und Attribute – Wichtig für Forschung mit GIS-Methoden Heute nicht betrachtet: ● Raster ● Bilder ● Tabellen ● Interviews ● ...
  • 3. 3 Früher: Geodaten-Bezug ● Weitergabe auf Datenträgern ● Suche nach Geodaten auf Webseiten verschiedener Anbieter ● Download gepackter Shapefiles ● Diverse Koordinaten- Bezugssysteme ● Zeichensätze „Am Anfang und am Ende der GIS-Karriere steht das Shapefile.“
  • 4. 4 Heute: Geodaten-Bezug ● OGC = Open Geospatial Consortium – Gemeinnützige Organisation, W3C-Mitglied – Allgemeingültige Standards zum Zweck der Interoperabilität – Mitglieder: Regierungsorganisationen, Industrie und Universitäten ● WFS = Web Feature Service – Aktueller Standard für Geometrien mit Attributen und Metadaten ● GeoServer – Referenz-Implementierung des OGC-Standards WFS, open source – Früher „Free Feature Server“, einfache Lösung für Geodaten als WFS
  • 5. 5 Geodaten-Zugriff mit WFS ● QGIS: WFS seit langem implementiert – WFS 2.0 als Plugin ● ArcGIS: „WFS to Featureclass“ – Ab ArcMap 10.3, teilweise Kompatibiltätsprobleme – ESRI konservativ mit Implementierung offener Standards ● R mit GDAL: Library „rgdal“, z.B. – ogrListLayers("WFS:http://maps.geo.hu-berlin.de/geoserver/wfs") – Geometrien und Attribute direkt in SpatialDataFrame laden ● Erforderlich: „GetCapabilities“-URL
  • 6. 6 Quellen für WFS-Geodaten ● Diverse Geoportale, GDI – Autoritäre Zusammenstellung der Dienste einer Peer-Group – Durchmischung mit WMS und anderen Diensten ● WFS Geodata Catalog (Server-Komponente) – http://wfs.geoclub.de/ - open source bei GitHub – Entwickelt für Geographisches Institut, HU Berlin – Website mit Datenbank für offene WFS-Layer – Crowdsourced durch WFS-Downloader, P2P-Netzwerk geplant ● Google „inurl:wfs inurl:getcapabilities“ ● Nutzungsrechte beachten!
  • 7. 7 ● WFS Geodata Catalog Stichwortsuche im WFS Geodata Catalog in den Metadaten der WFS-Layer Nutzungsbedingungen und -entgelte beachten!
  • 8. 8 WFS-Downloader (Client-Komponente) ● Speichert WFS-Layer als Shapefile ● Triviales Werkzeug ● Windows 7+ ● Open Source auf GitHub ● Benötigt GDAL ● Crowdsourcing
  • 9. 9 Crowdsourcing ● Layer-Abfrage im „crowd mode“ über Server optional ● Bereits bekannte Services als Dropdown-Liste ● Einmal verwendete Services als Layer automatisch in Katalog ergänzt ● API für Client/Server: Eingabe: URL (encoded) Ausgabe: Layerliste (ASCII) ● P2P: „ping“ Peer-Liste
  • 10. 10 QGIS WFS Connections Export ● Export XML-Datei für QGIS
  • 11. 11 Was nun? ● Katalog ausprobieren: http://wfs.geoclub.de/ – WFS-Downloader auch dort – Eigener WFS-Katalog mit Peering? ● Kontakt: moenkemt@geo.hu-berlin.de ● Noch Fragen?

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