LOFAR Linked Data Platform

This repository contains services to improve the FAIRness of the LOFAR Long Term Archive (meta)data using semantic web technologies:

• Virtuoso Universal Server (including some code from pbg-ld)
• FAIR Data Point (FDP)

1. Clone this git repo.

git clone https://github.com/EOSC-LOFAR/lofar-ld.git

2. Install Ansible.

pip install ansible

3. Deploy services.

ansible-playbook -i inventory playbook.yml # on a remote host specified in the 'inventory' file

make -C src # or locally

4. Login to running Virtuoso instance for admin tasks.

Use dba for both account name and password.

5. Run queries via Virtuoso SPARQL endpoint or browse data via Faceted Browser (no login required).

RDF graphs:IRIs (A-Box)

• (subset of) LOFAR DBView: https://lta-dbview.lofar.eu/
• FDP metadata:
  • http://lofar-ld.lofarpipelines-astron.surf-hosted.nl:8080/fdp
  • http://lofar-ld.lofarpipelines-astron.surf-hosted.nl:8080/catalog/astron-01
  • http://lofar-ld.lofarpipelines-astron.surf-hosted.nl:8080/dataset/lofar-lta-dbview
  • http://lofar-ld.lofarpipelines-astron.surf-hosted.nl:8080/distribution/lofar-lta-dbview-sparql
  • http://lofar-ld.lofarpipelines-astron.surf-hosted.nl:8080/distribution/lofar-lta-dbview-rdfdump
  • http://lofar-ld.lofarpipelines-astron.surf-hosted.nl:8080/distribution/lofar-lta-dbview-sqldump
  • http://lofar-ld.lofarpipelines-astron.surf-hosted.nl:8080/distribution/lofar-lta-dbview-csvdump

RDF graphs:IRIs (T-Box)

• Astronomy: http://www.astro.umd.edu/~eshaya/astro-onto/owl/astronomy.owl#
• Physics: http://www.astro.umd.edu/~eshaya/astro-onto/owl/physics.owl#
• Instruments: http://www.astro.umd.edu/~eshaya/astro-onto/owl/instruments.owl#
• IVOAT: http://www.ivoa.net/rdf/Vocabularies/IVOAT
• IVOAO: http://www.astro.umd.edu/~eshaya/astro-onto/owl/IVOAO.owl#
• UCD: http://www.ivoa.net/rdf/Vocabularies/UCD
• IAUT93: http://www.ivoa.net/rdf/Vocabularies/vocabularies-20091007/IAUT93/IAUT93.rdf#
• SEM: https://semanticweb.cs.vu.nl/2009/11/sem/sem.rdf#

See wiki for further details.