Linked Open Geo Data
A Quick Introduction
Created by Sean Gillies / @sgillies
Institute for the Study of the Ancient World, New York University
5 ★ Open Data
- 2010 addendum to T. Berners-Lee's Linked Data - Design Issues
- See also: 5 ★ Open Data
5 Stars of Open Geo Data
- Downloadable, openly licensed maps (PDFs, PNGs, &c.)
- Structured feature data (shapefiles, geodatabases)
- Open formats (KML, GeoJSON, RDF)
- Features denoted by URIs, so others can use them in their maps
- Link from features to other things to provide context
No Stars
★ Downloadable, open
★ ★ Structured features
★ ★ ★ Open formats
★ ★ ★ ★ URIs, URIs, URIs
★ ★ ★ ★ ★ Links
★ ★ ★ ★ ★ More Links
★ ★ ★ ★ ★ Even More Links
★ ★ ★ ★ ★ Links!
Features and relationships
- Ordnance Survey Ontology
- GeoVocab Geometry and Spatial Ontologies
- CIDOC-CRM
- Pleiades
Ordnance Survey
- Contains, Touches, Within
- Very specific to OS data
- Very influential
- http://data.ordnancesurvey.co.uk/ontology
OS Contains
GeoVocab
- Inspired by the OS Ontology
- Classes: spatial:Feature, geom:Geometry
- Properties: spatial:C ("connected with"), &c.
- Supports quantitative and qualitative GIS analysis
- geovocab.org
CIDOC-CRM
- E53 Places are geometries (of previous)
- GIS features are subclasses of E18 Physical Thing
- E47 Spatial Coordinates weakly specified
- E53 Place relationships: P121 Overlaps, P122 Borders With
- Many other relationships involving things, events
CRM Spatial
Pleiades Places
- Equivalent to spatial:Feature and crm:E27_Site
- Precise locations expressed using GeoVocab Geometry Ontology
- Rough locations expressed using OS Spatial Relations
- Networks expressed using GeoVocab Spatial Ontology
Feature Connections
5 Stars of Open Geo Data
- Downloadable, openly licensed maps (PDFs, PNGs, &c.)
- Structured feature data (shapefiles, geodatabases)
- Open formats (KML, GeoJSON, RDF)
- Features denoted by URIs, so others can use them in their maps
- Link from features to other things to provide context
Links
- geonames.org (Unxos GmbH): 8M features
- openstreetmap.org (OSM Foundation): 500K contributors
- linkedgeodata.org (University of Leipzig): 1B nodes, 100M ways
- geovocab.org