This document discusses linked spatial data and spatial data infrastructures. It provides examples of using URIs to represent spatial things and linking spatial datasets. Key points discussed include:
1. Using URIs and HTTP to identify spatial things like locations and allowing information about those things to be retrieved in different formats like RDF and GML.
2. Examples of using linked spatial data for tasks like looking up information, identifying locations, linking datasets, and querying spatial relationships between objects.
3. Initiatives to link spatial metadata standards like ISO19115 to open data schemas like DCAT-AP to make spatial data more accessible on the web.
4. Revenue models for linked data providers including public funding, advertisements, and
Adventures in Linked Data Land (presentation by Richard Light)jottevanger
"Adventures in Linked Data Land: bringing RDF to the Wordsworth Trust" is a paper given by RIchard Light (http://uk.linkedin.com/pub/richard-light/a/221/ba5) to a Linked Data meeting run by the Collections Trust in February 2010. He runs through the basics of LD, how it relates to cultural heritage, and some of his experiments with it, specifically with the data of the Wordsworth Trust, finally listing a series of challenges that face museums in trying to get on board the Linked Data bus.
As of Drupal 7 we'll have RDFa markup in core, in this session I will:
-explain what the implications are of this and why this matters
-give a short introduction to the Semantic web, RDF, RDFa and SPARQL in human language
-give a short overview of the RDF modules that are available in contrib
-talk about some of the potential use cases of all these magical technologies
Providing open data is of interest for its societal and commercial value, for transparency, and because more people can do fun things with data. There is a growing number of initiatives to provide open data, from, for example, the UK government and the World Bank. However, much of this data is provided in formats such as Excel files, or even PDF files. This raises the question of
- How best to provide access to data so it can be most easily reused?
- How to enable the discovery of relevant data within the multitude of available data sets?
- How to enable applications to integrate data from large numbers of formerly unknown data sources?
One way to address these issues to to use the design principles of linked data (http://www.w3.org/DesignIssues/LinkedData.html), which suggest best practices for how to publish and connect structured data on the Web. This presentation gives an overview of linked data technologies (such as RDF and SPARQL), examples of how they can be used, as well as some starting points for people who want to provide and use linked data.
The presentation was given on August 8, at the Hacknight event (http://hacknight.se/) of Forskningsavdelningen (http://forskningsavd.se/) (Swedish: “Research Department”) a hackerspace in Malmö.
Adventures in Linked Data Land (presentation by Richard Light)jottevanger
"Adventures in Linked Data Land: bringing RDF to the Wordsworth Trust" is a paper given by RIchard Light (http://uk.linkedin.com/pub/richard-light/a/221/ba5) to a Linked Data meeting run by the Collections Trust in February 2010. He runs through the basics of LD, how it relates to cultural heritage, and some of his experiments with it, specifically with the data of the Wordsworth Trust, finally listing a series of challenges that face museums in trying to get on board the Linked Data bus.
As of Drupal 7 we'll have RDFa markup in core, in this session I will:
-explain what the implications are of this and why this matters
-give a short introduction to the Semantic web, RDF, RDFa and SPARQL in human language
-give a short overview of the RDF modules that are available in contrib
-talk about some of the potential use cases of all these magical technologies
Providing open data is of interest for its societal and commercial value, for transparency, and because more people can do fun things with data. There is a growing number of initiatives to provide open data, from, for example, the UK government and the World Bank. However, much of this data is provided in formats such as Excel files, or even PDF files. This raises the question of
- How best to provide access to data so it can be most easily reused?
- How to enable the discovery of relevant data within the multitude of available data sets?
- How to enable applications to integrate data from large numbers of formerly unknown data sources?
One way to address these issues to to use the design principles of linked data (http://www.w3.org/DesignIssues/LinkedData.html), which suggest best practices for how to publish and connect structured data on the Web. This presentation gives an overview of linked data technologies (such as RDF and SPARQL), examples of how they can be used, as well as some starting points for people who want to provide and use linked data.
The presentation was given on August 8, at the Hacknight event (http://hacknight.se/) of Forskningsavdelningen (http://forskningsavd.se/) (Swedish: “Research Department”) a hackerspace in Malmö.
Maintaining scholarly standards in the digital age: Publishing historical gaz...Humphrey Southall
This presentation: (1( Discusses why providing detailed attributions of individual contributions is essential to large scale sharing of historical research data; (2) Provides a short introduction to Open Linked Data; (3) Introduces the PastPlace Gazetteer API (Applications Programming Interface), explaining components of the RDF it generates using the example of Oxford, UK; (4) Notes that most open data projects use the Creative Commons -- Must Ackowledge license (CC-BY) while not actually acknowledging contributors within their RDF, then shows how we do it; (5) Introduces the separate PastPlace Datafeed API, which implements the W3C Datacube Vocabulary.
nanopub-java: A Java Library for NanopublicationsTobias Kuhn
The concept of nanopublications was first proposed about six years ago, but it lacked openly available implementations. The library presented here is the first one that has become an official implementation of the nanopublication community. Its core features are stable, but it also contains unofficial and experimental extensions: for publishing to a decentralized server network, for defining sets of nanopublications with indexes, for informal assertions, and for digitally signing nanopublications. Most of the features of the library can also be accessed via an online validator interface.
Existing data management approaches assume control over schema, data and data generation, which is not the case in open, de-centralised environments such as the Web. The lack of control means that there are social processes necessary to generate 'ordo ab chao' and hence a new life cycle model is necessary.
Based on our experience in Linked Data publishing and consumption over the past years, we have identify involved parties and fundamental phases, which provide for a multitude of so called Linked Data life cycles.
If you want to hear me speak to the slides, you might want to check out the following videos on YouTube:
Part 1: http://www.youtube.com/watch?v=AFJSMKv5s3s
Part 2: http://www.youtube.com/watch?v=G6YJSZdXOsc
Part 3: http://www.youtube.com/watch?v=OagzNpDEPJg
An introduction deck for the Web of Data to my team, including basic semantic web, Linked Open Data, primer, and then DBpedia, Linked Data Integration Framework (LDIF), Common Crawl Database, Web Data Commons.
Drupal 7 will use RDFa markup in core, in this session I will:
-explain what the implications are of this and why this matters
-give a short introduction to the Semantic web, RDF, RDFa and SPARQL in human language
-give a short overview of the RDF modules that are available in contrib
-talk about some of the potential use cases of all these magical technologies
This is a talk from the Drupal track at Fosdem 2010.
This presentation introduces ResourceSync, a specification aimed to enable web-based synchronization of resources. The specification is the result of a collaboration between NISO and the Open Archives Initiative funded by the Sloan Foundation and JISC. The proposed resource synchronization approach is based on several existing specifications (e.g. Sitemaps, PubSubHubbub, well-known URI) and is aligned with common architectural principles (e.g. REST, follow your nose).
A 15 minute video version of these slides is available at https://www.youtube.com/watch?v=ASQ4jMYytsA
[Webinar] FactForge Debuts: Trump World Data and Instant Ranking of Industry ...Ontotext
This webinar continues series are demonstrating how linked open data and semantic tagging of news can be used for comprehensive media monitoring, market and business intelligence. The platform for the demonstrations is FactForge: a hub for news and data about people, organizations, and locations (POL). FactForge embodies a big knowledge graph (BKG) of more than 1 billion facts that allows various analytical queries, including tracing suspicious patterns of company control; media monitoring of people, including companies owned by them, their subsidiaries, etc.
An introduction to the basics and benefits of using Open Data. Slides from my presentation of this topic at the JavaZone 2009 conference in Oslo, Norway.
Maintaining scholarly standards in the digital age: Publishing historical gaz...Humphrey Southall
This presentation: (1( Discusses why providing detailed attributions of individual contributions is essential to large scale sharing of historical research data; (2) Provides a short introduction to Open Linked Data; (3) Introduces the PastPlace Gazetteer API (Applications Programming Interface), explaining components of the RDF it generates using the example of Oxford, UK; (4) Notes that most open data projects use the Creative Commons -- Must Ackowledge license (CC-BY) while not actually acknowledging contributors within their RDF, then shows how we do it; (5) Introduces the separate PastPlace Datafeed API, which implements the W3C Datacube Vocabulary.
nanopub-java: A Java Library for NanopublicationsTobias Kuhn
The concept of nanopublications was first proposed about six years ago, but it lacked openly available implementations. The library presented here is the first one that has become an official implementation of the nanopublication community. Its core features are stable, but it also contains unofficial and experimental extensions: for publishing to a decentralized server network, for defining sets of nanopublications with indexes, for informal assertions, and for digitally signing nanopublications. Most of the features of the library can also be accessed via an online validator interface.
Existing data management approaches assume control over schema, data and data generation, which is not the case in open, de-centralised environments such as the Web. The lack of control means that there are social processes necessary to generate 'ordo ab chao' and hence a new life cycle model is necessary.
Based on our experience in Linked Data publishing and consumption over the past years, we have identify involved parties and fundamental phases, which provide for a multitude of so called Linked Data life cycles.
If you want to hear me speak to the slides, you might want to check out the following videos on YouTube:
Part 1: http://www.youtube.com/watch?v=AFJSMKv5s3s
Part 2: http://www.youtube.com/watch?v=G6YJSZdXOsc
Part 3: http://www.youtube.com/watch?v=OagzNpDEPJg
An introduction deck for the Web of Data to my team, including basic semantic web, Linked Open Data, primer, and then DBpedia, Linked Data Integration Framework (LDIF), Common Crawl Database, Web Data Commons.
Drupal 7 will use RDFa markup in core, in this session I will:
-explain what the implications are of this and why this matters
-give a short introduction to the Semantic web, RDF, RDFa and SPARQL in human language
-give a short overview of the RDF modules that are available in contrib
-talk about some of the potential use cases of all these magical technologies
This is a talk from the Drupal track at Fosdem 2010.
This presentation introduces ResourceSync, a specification aimed to enable web-based synchronization of resources. The specification is the result of a collaboration between NISO and the Open Archives Initiative funded by the Sloan Foundation and JISC. The proposed resource synchronization approach is based on several existing specifications (e.g. Sitemaps, PubSubHubbub, well-known URI) and is aligned with common architectural principles (e.g. REST, follow your nose).
A 15 minute video version of these slides is available at https://www.youtube.com/watch?v=ASQ4jMYytsA
[Webinar] FactForge Debuts: Trump World Data and Instant Ranking of Industry ...Ontotext
This webinar continues series are demonstrating how linked open data and semantic tagging of news can be used for comprehensive media monitoring, market and business intelligence. The platform for the demonstrations is FactForge: a hub for news and data about people, organizations, and locations (POL). FactForge embodies a big knowledge graph (BKG) of more than 1 billion facts that allows various analytical queries, including tracing suspicious patterns of company control; media monitoring of people, including companies owned by them, their subsidiaries, etc.
An introduction to the basics and benefits of using Open Data. Slides from my presentation of this topic at the JavaZone 2009 conference in Oslo, Norway.
The new CIARD RING, a machine-readable directory of datasets for agricultureValeria Pesce
The CIARD RING, a global directory of datasets for agriculture, has been enhanced during the EC-funded agINFRA project. It has become a Linked Data hub that can be queried by other applications.
Presented at the 4th RDA Plenary Meeting in Amsterdam on 22/09/2014.
OSFair2017 Workshop | EPOS: European Plate Observing SystemOpen Science Fair
Keith G Jeffery presents the European Plate Obserinv System (EPOS) | OSFair2017 Workshop
Workshop title: How FAIR friendly is your data catalogue?
Workshop overview:
This workshop will build upon the work planned by the EOSCpilot data interoperability task and the BlueBridge workshop held on April 3 at the RDA meeting. We will investigate common mechanisms for interoperation of data catalogues that preserve established community standards, norms and resources, while simplifying the process of being/becoming FAIR. Can we have a simple interoperability architecture based on a common set of metadata types? What are the minimum metadata requirements to expose FAIR data to EOSC services and EOSC users?
DAY 3 - PARALLEL SESSION 6 & 7
The Semantic Web is about to grow up. By efforts such as the Linked Open Data initiative, we finally find ourselves at the edge of a Web of Data becoming reality. Standards such as OWL 2, RIF and SPARQL 1.1 shall allow us to reason with and ask complex structured queries on this data, but still they do not play together smoothly and robustly enough to cope with huge amounts of noisy Web data. In this talk, we discuss open challenges relating to querying and reasoning with Web data and raise the question: can the emerging Web of Data ever catch up with the now ubiquitous HTML Web?
Slides of the presentation by Hugh Williams of OpenLink Software in the course of the LOD2 webinar: Virtuoso Universal Server on 20.12. 2011 - for more information please see: http://lod2.eu/BlogPost/webinar-series
RO-Crate: A framework for packaging research products into FAIR Research ObjectsCarole Goble
RO-Crate: A framework for packaging research products into FAIR Research Objects presented to Research Data Alliance RDA Data Fabric/GEDE FAIR Digital Object meeting. 2021-02-25
Science Services and Science Platforms: Using the Cloud to Accelerate and Dem...Ian Foster
Ever more data- and compute-intensive science makes computing increasingly important for research. But for advanced computing infrastructure to benefit more than the scientific 1%, we need new delivery methods that slash access costs, new sustainability models beyond direct research funding, and new platform capabilities to accelerate the development of new, interoperable tools and services.
The Globus team has been working towards these goals since 2010. We have developed software-as-a-service methods that move complex and time-consuming research IT tasks out of the lab and into the cloud, thus greatly reducing the expertise and resources required to use them. We have demonstrated a subscription-based funding model that engages research institutions in supporting service operations. And we are now also showing how the platform services that underpin Globus applications can accelerate the development and use of an integrated ecosystem of advanced science applications, such as NCAR’s Research Data Archive and OSG Connect, thus enabling access to powerful data and compute resources by many more people than is possible today.
In this talk, I introduce Globus services and the underlying Globus platform. I present representative applications and discuss opportunities that this platform presents for both small science and large facilities.
LOD2 plenary meeting in Paris: presentation of WP6: State of Play: LOD2 Stack Architecture, by Bert Van Nuffelen, Kurt De Muelenaere, Bastiaan Deblieck - TenForce.
2015 FOSS4G Track: Open Specifications for the Storage, Transport and Process...GIS in the Rockies
This talk presents an overview of some of the most important Open Specifications (OS) for the storage, transport and processing of geospatial data and why they matter for the development of the next generation of geospatial systems and data infrastructures. What is the importance of being Open? What is the relationship of OS and geospatial software (both FOSS4G and private/proprietary software)? A Web-based system architecture based on OS and FOSS4G will be presented.
Introduction to the Data Web, DBpedia and the Life-cycle of Linked DataSören Auer
Over the past 4 years, the Semantic Web activity has gained momentum with the widespread publishing of structured data as RDF. The Linked Data paradigm has therefore evolved from a practical research idea into
a very promising candidate for addressing one of the biggest challenges
of computer science: the exploitation of the Web as a platform for data
and information integration. To translate this initial success into a
world-scale reality, a number of research challenges need to be
addressed: the performance gap between relational and RDF data
management has to be closed, coherence and quality of data published on
the Web have to be improved, provenance and trust on the Linked Data Web
must be established and generally the entrance barrier for data
publishers and users has to be lowered. This tutorial will discuss
approaches for tackling these challenges. As an example of a successful
Linked Data project we will present DBpedia, which leverages Wikipedia
by extracting structured information and by making this information
freely accessible on the Web. The tutorial will also outline some recent advances in DBpedia, such as the mappings Wiki, DBpedia Live as well as
the recently launched DBpedia benchmark.
Apache Spark and Object Stores —for London Spark User GroupSteve Loughran
The March 2017 version of the "Apache Spark and Object Stores", includes coverage of the Staging Committer. If you'd been at the talk you'd have seen the projector fail just before the demo. It worked earlier! Honest!
Raster data in GeoServer and GeoTools: Achievements, issues and future devel...GeoSolutions
The purpose of this presentation is, on a side, to dissect the developments performed during last year as far as raster data support in GeoTools and GeoServer is concerned, while on the other side to introduce and discuss the future development directions.
Advancements and improvements for the management of raster mosaic and pyramids will be introduced and analyzed, as well as the latest developments for the exploitation of GDAL raster sources.
Extensive details will be provided on the latest updates for the management of multidimensional raster data used in the Remote Sensing and MetOc fields.
The presentation will also introduce and provide updates on the JAITools and ImageIO-Ext projects. JAITools provides a number of new raster data analysis operators, including powerful and fast raster algebra support. ImageIO-Ext bridges the gap across the Java world and native raster data access libraries providing high performance access to GDAL, Kakadu and other libraries.
The presentation will wrap up providing an overview of unresolved issues and challenges that still need to be addressed, suggesting tips and workarounds allowing to leverage the full potential of the systems.
Visualising statistical Linked Data with PloneEau de Web
Presentation of a Plone-based tool that can create graphical visualisations of semantic statistical data expressed using the RDF Data Cube Vocabulary and queried using generated SPARQL statements. The tool was developed under a project funded by the European Commission and is publicly available at www.digital-agenda-data.eu
Similar to Flagis linked open_data_stijn_goedertier (20)
Data Centers - Striving Within A Narrow Range - Research Report - MCG - May 2...pchutichetpong
M Capital Group (“MCG”) expects to see demand and the changing evolution of supply, facilitated through institutional investment rotation out of offices and into work from home (“WFH”), while the ever-expanding need for data storage as global internet usage expands, with experts predicting 5.3 billion users by 2023. These market factors will be underpinned by technological changes, such as progressing cloud services and edge sites, allowing the industry to see strong expected annual growth of 13% over the next 4 years.
Whilst competitive headwinds remain, represented through the recent second bankruptcy filing of Sungard, which blames “COVID-19 and other macroeconomic trends including delayed customer spending decisions, insourcing and reductions in IT spending, energy inflation and reduction in demand for certain services”, the industry has seen key adjustments, where MCG believes that engineering cost management and technological innovation will be paramount to success.
MCG reports that the more favorable market conditions expected over the next few years, helped by the winding down of pandemic restrictions and a hybrid working environment will be driving market momentum forward. The continuous injection of capital by alternative investment firms, as well as the growing infrastructural investment from cloud service providers and social media companies, whose revenues are expected to grow over 3.6x larger by value in 2026, will likely help propel center provision and innovation. These factors paint a promising picture for the industry players that offset rising input costs and adapt to new technologies.
According to M Capital Group: “Specifically, the long-term cost-saving opportunities available from the rise of remote managing will likely aid value growth for the industry. Through margin optimization and further availability of capital for reinvestment, strong players will maintain their competitive foothold, while weaker players exit the market to balance supply and demand.”
Chatty Kathy - UNC Bootcamp Final Project Presentation - Final Version - 5.23...John Andrews
SlideShare Description for "Chatty Kathy - UNC Bootcamp Final Project Presentation"
Title: Chatty Kathy: Enhancing Physical Activity Among Older Adults
Description:
Discover how Chatty Kathy, an innovative project developed at the UNC Bootcamp, aims to tackle the challenge of low physical activity among older adults. Our AI-driven solution uses peer interaction to boost and sustain exercise levels, significantly improving health outcomes. This presentation covers our problem statement, the rationale behind Chatty Kathy, synthetic data and persona creation, model performance metrics, a visual demonstration of the project, and potential future developments. Join us for an insightful Q&A session to explore the potential of this groundbreaking project.
Project Team: Jay Requarth, Jana Avery, John Andrews, Dr. Dick Davis II, Nee Buntoum, Nam Yeongjin & Mat Nicholas
Explore our comprehensive data analysis project presentation on predicting product ad campaign performance. Learn how data-driven insights can optimize your marketing strategies and enhance campaign effectiveness. Perfect for professionals and students looking to understand the power of data analysis in advertising. for more details visit: https://bostoninstituteofanalytics.org/data-science-and-artificial-intelligence/
4. Linked Data design rules
HTTP GET http://dbpedia.org/resource/Tim_berners-lee Accept: "text/rdf+n3"
HTTP/1.1 303 See Other
Server: Virtuoso/07.20.3217 (Linux) i686-generic-linux-glibc212-64 VDB
Content-Type: text/rdf+n3
Location: http://dbpedia.org/data/Tim_berners-lee.nt
HTTP GET http://dbpedia.org/data/Tim_berners-lee.nt
HTTP/1.1 200 OK
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix wikipedia-en: <http://en.wikipedia.org/wiki/> .
@prefix dbr: <http://dbpedia.org/resource/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix prov: <http://www.w3.org/ns/prov#> .
wikipedia-en:Tim_berners-lee foaf:primaryTopicdbr:Tim_berners-lee .
dbr:Tim_berners-lee owl:sameAs <http://rdf.freebase.com/ns/m.07d5b> .
dbr:Tim_berners-lee rdfs:label "Tim berners-lee"@en ;
foaf:isPrimaryTopicOf wikipedia-en:Tim_berners-lee .
dbr:Tim_berners-lee prov:wasDerivedFrom
<http://en.wikipedia.org/wiki/Tim_berners-lee?oldid=291475851> .
1. Use URIs as names for things
2. Use HTTP URIs so that people can look up those
names.
5. Linked Data design rules
HTTP GET http://dbpedia.org/resource/Tim_berners-lee Accept: "text/rdf+n3"
HTTP/1.1 303 See Other
Server: Virtuoso/07.20.3217 (Linux) i686-generic-linux-glibc212-64 VDB
Content-Type: text/rdf+n3
Location: http://dbpedia.org/data/Tim_berners-lee.nt
HTTP GET http://dbpedia.org/data/Tim_berners-lee.nt
HTTP/1.1 200 OK
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix wikipedia-en: <http://en.wikipedia.org/wiki/> .
@prefix dbr: <http://dbpedia.org/resource/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix prov: <http://www.w3.org/ns/prov#> .
wikipedia-en:Tim_berners-lee foaf:primaryTopicdbr:Tim_berners-lee .
dbr:Tim_berners-lee owl:sameAs <http://rdf.freebase.com/ns/m.07d5b> .
dbr:Tim_berners-lee rdfs:label "Tim berners-lee"@en ;
foaf:isPrimaryTopicOf wikipedia-en:Tim_berners-lee .
dbr:Tim_berners-lee prov:wasDerivedFrom
<http://en.wikipedia.org/wiki/Tim_berners-lee?oldid=291475851> .
1. Use URIs as names for things
2. Use HTTP URIs so that people can look up those
names.
3. Provide useful information, using the
standards (RDF*, SPARQL), when
someone looks up a URI.
4. Include links to other URIs so that
they can discover more things.
6. Not all Linked Data is Open Data…
Open data is data available under an open licence (open
data and content can be freely used, modified, and
shared by anyone for any purpose e.g. CC0)
[OpenDefinition]
There is also Linked Closed Data, e.g. for privacy or
commercial reasons.
8. In RDF
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix geo: <http://www.opengis.net/ont/geosparql#> .
@prefix sf: <http://www.opengis.net/ont/sf#>.
@prefix locn: <https://www.w3.org/ns/locn#> .
@prefix kbo: <http://data.kbodata.be/organisation/> .
@prefix statbel: <http://location.testproject.eu/so/au/AdministrativeUnit/STATBEL/>.
kbo:0454_064_819 a rov:RegisteredOrganization;
rdfs:label "G.I.M - Geographic Information Management";
locn:address :gimAddress;
geo:hasGeometry :gimPoint.
:gimPoint a sf:Point;
geo:asWKT "POINT(50.8669778 4.7135173)"^^geo:wktLiteral.
:gimAddress a locn:Address
locn:fullAddress "Philipssite 5 Bus 27 3001 Leuven";
locn:geometry :gimPoint.
statbel:24062 a locn:GeographicName;
rdfs:label "Leuven";
geo:hasGeometry :leuvenPolygon.
:leuvenPolygon a sf:Polygon;
geo:asWKT "POLYGON(4.6894703 50.9440707, 4.6897756 50.9439115,
4.6903806 50.9436067, 4.690979 50.9432192, …)"^^geo:wktLiteral.
9. Spatial Data Infrastructures
… and the Web
▶ Spatial Data Infrastructures: for experts
• Rich APIs: OGC CSW, WMS, WFS, …
• Rich representations: GML, …
• Many Coordinate Reference Systems
10. Spatial Data Infrastructures
… and the Web
▶ Spatial Data Infrastructures: for experts
• Rich APIs: OGC CSW, WMS, WFS, …
• Rich representations: GML, …
• Many Coordinate Reference Systems
▶ Linked Spatial Data: for Web developers
• Simple APIs: HTTP, (SPARQL)
• Simple representations: GeoJSON, RDF,
GeoSPARQL, …
• Fewer Coordinate Reference Systems:
WGS84
11. Spatial standards and the Web
1989: Word Wide Web
1991: HTTPv0.9
1999: W3C RDF
2006: Linked Data Design Rules
2008: KML
2008: GeoJSON
2009: OGC GeoSPARQL
2012: ISA Core Location
2013: Annex on URIs in INSPIRE
2014: INSPIRE as Linked Data
2014: OGC/W3C Spatial Data on the Web
2008: W3C SPARQL
2007: OGC GML
1995: IETF HTML 2.0
2000: HTTPv1.1
2000: ReST
1999: OGC WKT (SQL)
WebStandardsSpatialDataStandards
2002: OGC WFS
12. GeoDCAT-AP
The geospatial community use mature standards for
descriptive metadata (ISO19115) and discovery services
(OGC CSW) …
… but open data portals speak DCAT-AP.
GeoDCAT-AP indicates how geo-
metadata records can be encoded in
DCAT-AP.
Translation from ISO19115 to
GeoDCAT-AP implemented using
XSLT and embedded in GeoNetwork.
A large majority of datasets on open
data portals are spatial data.
14. Generic use cases for linked spatial data
Identifier
(HTTP URI)
Name or
Address
Look up: get data
from a URI such as the
name or address of a
feature
Identify (reconcile,
disambiguate) an
address notation
Link datasets by means
of commonly used
identifiers
Example:
Chaussée de Bruxelles 135
1310 La Hulpe
Example:
http://location.testproject.
eu/so/ad/AddressRepresen
tation/SPW/248565
50.8672312,4.7127429
Geometry
Reverse geocode
find feature(s) based on
a location
Geocode retrieve the
location(s) of a feature
expressed as a geometry
Locate objects by
comparing their relative
geometric positions
Linked DataSpatial Data
15. Example: Linked Address Data
OpenLink Virtuoso
UrBIS - Brussels
Capital Region
CRAB - Flanders PICC - Wallonia
DATA CONSUMER
sample address data in native format
Linked address data
Common Data models
RDF view
SPARQL endpoint
INSPIRE
lookup, identify, link, locate, geocode,
reverse gecode
XML view
Xquery,
Xpath
• XML and RDF
views on
relational data
served over a
Web interface
http://location.testproject.eu/BEL/
17. Use case: lookup
GIM - linked spatial data: where is the link?
Lookup: Retrieve structured data from a URI in
various formats.
18. Use case: lookup
GIM - linked spatial data: where is the link?
Lookup: Retrieve structured data from a URI in
various formats.
GET http://location.testproject.eu/so/au/AdministrativeUnit/STATBEL/25050
Accept: "application/rdf+xml"
HTTP/1.1 303 See Other
Server: Virtuoso/07.10.3207 (Linux) x86_64-pc-linux-gnu
Date: Mon, 09 May 2016 14:15:22 GMT
Location: http://location.testproject.eu/doc/au/AdministrativeUnit/STATBEL/25050.rdf
GET http://location.testproject.eu/so/au/AdministrativeUnit/STATBEL/25050
Accept: "application/gml+xml"
HTTP/1.1 303 See Other
Server: Virtuoso/07.10.3207 (Linux) x86_64-pc-linux-gnu
Date: Mon, 09 May 2016 14:15:23 GMT
Location: http://location.testproject.eu/doc/au/AdministrativeUnit/STATBEL/25050.xml
19. Use case: locate – implicit links
Locate spatial objects by comparing their relative
geometric positions. (Spatial data is implicitly linked
without URIs!)
Topological relations:
:A geo:sfEquals :B. :A geo:sfDisjoint :B
:A geo:sfContains :B:B geo:sfOverlaps :A
A geo:sfTouches :B
20. Use case: locate
GeoSPARQL query: which companies are within the
administrative boundaries of Leuven?
PREFIX geo: <http://www.opengis.net/ont/geosparql#>
PREFIX rov: <http://www.w3.org/ns/regorg#>
SELECT ?company
WHERE {
?company a rov:RegisteredOrganization;
geo:hasGeometry ?cgeo .
statbel:24062 geo:hasGeometry ?leuvenPolygon .
?cgeo geo:sfWithin ?leuvenPolygon .
}
23. BelMap GeoDaaS
GIMs BelMap GeoDaaS platform offers linked data on
Belgian addressable objects with persistent identifiers.
Used within the COMBUST ICONProject (Funded by
iMinds, IWT and Innoviris.) for linking data on
businesses.
24. Revenue models for Linked Data?
• Public funding: governments publish linked open
data to grow the data economy and bring social
benefits.
• Advertisement: being paid for online advertisements
on generated traffic.
• Subscription: being paid by a user base of
professional clients. Often using a freemium pricing
model.
26. Index structured data from the Web using
e.g. Schema.org annotated content
Lots of spatial data modelling in
schema.org:
• schema:Place
• schema:AdministrativeArea
• schema:LocalBusiness
• …
• schema:StruturedValue
• schema:PostalAddres
• schema:GeoCoordinates
• schema:GeoShape
27. Where is the link?
Linked Data requires stable interfaces.
App developers will only rely on Web identifiers of
others if they provide credible service level
guarantees...
28. How to publish linked spatial data?
Continually improve the quality of your data
Find the right licence and funding model
Define persistent URIs
Use a stable vocabulary
Reuse existing infrastructure (e.g. WFS)
You don’t need a public SPARQL endpoint
29. Stijn Goedertier
GeoICT Project Manager
stijn.goedertier@gim.be
Steven Smolders
Technology Director
steven.smolders@gim.be
Thank you!