Cataloguing open geodata with 

philippe duchesne
phd@highlatitud.es
@pduchesne

FOSS4G Belgium
29/10/2015

new features, Belgian perspective

History

okfn & ckan

  • worldwide non-profit foundation
  • using advocacy, technology and training to promote open knowledge
  • open data management platform
  • open source
  • large community

data.gov

ckan worldwide

data.gov.uk

data.gouv.fr

opendata.vlaanderen.be

publicdata.eu

dados.gov.br

data.overheid.nl

check  ckan.org/instances

Quick tour

  • Search and discoverability for users
    • ​Central full-text search
    • Faceted search on main metadata fields
    • Previews and data exploration
  • Data management for publishers
    • ​Metadata edition
    • Workflow and approval
    • Fine grained authorization controls
    • Download and view statistics
  • Extensible architecture and APIs for developers
    • Extensible schema
    • Extension API
    • REST API
    • Specialized extensions: data API, analytics, harvesting, spatial...

core features

architecture

CKAN core

Web portal

HTTP API
REST/JSON/RDF

CSW Interface

Harvesters

remote CKAN

DCAT

CSW / ISO

data storage

metadata storage

Web portal

CSW Interface

data storage

CSW / ISO

Geospatial Features

extensions

official CKAN extensions

  • ckanext-spatial
    • model & indexing
    • search
    • harvesters
    • basic preview
  • ckanext-geoview
    • OpenLayers based
    • extended support for various formats
      • geoJSON, KML, GML, WMS, WFS, Arcgis, Google Fusion Tables
         
  • many other community-driven projects

storage & indexing

  • model based on geoJSON
  • indexing in Solr or PostGIS

CKAN core

Web portal

HTTP API
REST/JSON/RDF

CSW Interface

Harvesters

remote CKAN

DCAT

CSW / ISO

data storage

metadata storage

search & visualization

  • search by bounding box
  • display of result extents

search & visualization

WMS

,WFS

, geoJSON, KML, GML, arcREST, Google Fusion Tables

OpenLayers based

harvesting

  • ISO19139 metadata
    • customizable schema mapping
  • remote CSW
    • based on OWSlib (python client for OGC services)
  • allows for CSW federation
    (together with CSW interface)
  • auto generation of generic preview on harvest

CKAN core

Web portal

HTTP API
REST/JSON/RDF

CSW Interface

Harvesters

remote CKAN

DCAT

CSW / ISO

data storage

metadata storage

CSW interface

  • relies on a separate pyCSW instance
    (python CSW server)
     
  • integration with pyCSW through the CKAN API
     
  • allows re-publishing of datasets that were harvested from remote CSW or ISO19139
     

CKAN core

Web portal

HTTP API
REST/JSON/RDF

CSW Interface

Harvesters

remote CKAN

DCAT

CSW / ISO

data storage

metadata storage

Inspire compliance

 

  • support for Inspire standards
    • harvesting (CSW)
    • viewing (WMS,WFS)
    • re-publishing (CSW)
       
  • allows federation of CSW catalogs
     
  • allows bridging of Inspire data and services with non-geo world (in particular with DCAT AP)

Belgian instances

wallonia :  opendata.digitalwallonia.be

flanders :  opendata.vlaanderen.be

flanders :  opendata.vlaanderen.be

federating various admin entities through harvesting

Wrapping up

  • geoDCAT support
    • formalizes ISO19115/119 to DCAT mapping

  • advanced geoview configuration
    • stored styles
    • feature interactions
      ​
  • OWS Context support

what's next?

  • goal is not so much to have advanced geoviz, but rather allow a quick understanding and exploration of the content to favor re-use
     
  • 'Spatial is not special'
    • geo data is just another data type in the open data range
    • real added value and emerging semantics come  from mixing heterogeneous types

conclusion

check out and contribute

 

  • https://github.com/ckan/ckan
  • https://github.com/ckan/ckanext-spatial
  • https://github.com/ckan/ckanext-geoview

philippe duchesne

phd @ highlatitud.es

@ pduchesne

thank you

questions?

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