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all_dic
design
experiments
nuts-links
parser Minor Sep 28, 2012
silk
website
README.md

README.md

Eurostat dataset

About

This project is about publishing EuroStat as Linked Data on the Web.

Design

1) Base URI would be http://eurostat.linked-statistics.org.

2) VoID discovery mechanism would be delivered through http://eurostat.linked-statistics.org/.well-known/void. Upon discovery, the system will serve the VoID description which would be like :

            @prefix meta: <http://eurostat.linked-statistics.org/meta#> . 
            @prefix dss: <http://eurostat.linked-statistics.org/dss/> .
            @prefix dcterms: <http://purl.org/dc/terms/> .
            @prefix void: <http://rdfs.org/ns/void#> .

                 meta:Eurostat a void:Dataset;
                                dcterms:title "EuroStat";
                            void:subset
                            dss:ds_1,
                            dss:ds_2
                            .

3) Upon de-referencing any dataset, we serve the DataSet Summary (DSS):

            @prefix data: <http://eurostat.linked-statistics.org/data/> .
            @prefix dss: <http://eurostat.linked-statistics.org/dss/> .
            @prefix dsd: <http://eurostat.linked-statistics.org/dsd#> .
            @prefix qb: <http://purl.org/linked-data/cube#> .
            @prefix void: <http://rdfs.org/ns/void#> .

                     dss:ds_1 a qb:DataSet, void:Dataset;
                        qb:DataStructureDefinition dsd:dsd_1;
                        void:dataDump data:ds_1.ttl
                        .

Remarks

1) Use N-Quads format to generate dataset triples.

2) Reuse code from linked-eurostat for Dataset RDFication.

3) Use our own code for DSD RDFication.

Batch Scripts

Detailed description on each script can be found at this page

Steps to RDFize EuroStat data

The RDFication process can be found at this page

How to convert a single dataset to RDF

  • The best way to test the RDFication process is to use Main.sh script. You are required to download the *.zip file(s) in a directory before running the script. It can be achieved by running `EurostatMirror.sh.
  • Change the directory path variables in the Main.sh to your desired directory paths. Make sure that the directories exists before running the script.
  • How to run : sh Main.sh -i ~/sdmx-code.ttl -l ~/logs/

Example Query

Here is an examplary quert that joins two SDMX datasets:

PREFIX rdfs: http://www.w3.org/2000/01/rdf-schema#
PREFIX qb: http://purl.org/linked-data/cube#
PREFIX e: http://ontologycentral.com/2009/01/eurostat/ns#
PREFIX sdmx-measure: http://purl.org/linked-data/sdmx/2009/measure#
PREFIX skos: http://www.w3.org/2004/02/skos/core#
PREFIX g: http://eurostat.linked-statistics.org/ontologies/geographic.rdf#
PREFIX dataset: http://eurostat.linked-statistics.org/data/
SELECT ?nuts2
SUM(xsd:decimal(?pop)) AS ?population
?wateruse
xsd:decimal(?wateruse)*1000000/SUM(xsd:decimal(?pop)) AS
?percapita WHERE { ?observation qb:dataset dataset:demo_r_pjanaggr3 ;
e:time http://eurostat.linked-statistics.org/dic/time#2007;
e:age http://eurostat.linked-statistics.org/dic/age#TOTAL;
e:sex http://eurostat.linked-statistics.org/dic/sex#F;
e:geo ?ugeo;
sdmx-measure:obsValue ?pop.
?ugeo g:hasParentRegion ?parent.
?parent rdfs:label ?nuts2.
?wuregion qb:dataset dataset:env_n2_wu ;
e:geo ?parent;
e:cons http://eurostat.linked-statistics.org/dic/cons#W18_2_7_2;
e:time http://eurostat.linked-statistics.org/dic/time#2007;
sdmx-measure:obsValue ?wateruse.
} GROUP BY ?nuts2 ?wateruse ORDER BY DESC(?percapita)

The query above uses dataset demo_r_pjanaggr3, which contains Population by sex and age groups on 1 January - NUTS level 3 regions. We need populations for NUTS level 2 and we therefore aggregate the dataset by using the NUTS vocabulary to find the parent regions.

We only want data for 2007, and both sexes. We then join the data with the env_n2_wu dataset, which contains Water use (NUTS2) - mio m3. We can then find the regions with the most domestic water (code W18_2_7_2) use per million inhabitants.

Another example query

Below is a SPARQL query that combines 24 Eurostat datasets. It is a combined query on all national statistics for Albacore. The idea is to see if a species needs further protection in the form of fishing quotas etc. A similar query is used here.

PREFIX qb: <http://purl.org/linked-data/cube#>
PREFIX e: <http://ontologycentral.com/2009/01/eurostat/ns#>
PREFIX sdmx-measure: <http://purl.org/linked-data/sdmx/2009/measure#>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
PREFIX g: <http://eurostat.linked-statistics.org/ontologies/geographic.rdf#>
PREFIX dataset: <http://eurostat.linked-statistics.org/data/>
PREFIX eunis: <http://eunis.eea.europa.eu/rdf/species-schema.rdf#>

SELECT ?country ?year ?presentation ?landed ?unit
FROM <http://eurostat.linked-statistics.org/data/fish_ld_be.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_bg.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_cy.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_de.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_dk.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_ee.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_es.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_fi.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_fr.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_gr.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_ie.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_is.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_it.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_lt.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_lv.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_mt.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_nl.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_no.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_pl.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_pt.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_ro.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_se.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_si.rdf>
FROM <http://eurostat.linked-statistics.org/data/fish_ld_uk.rdf>
FROM <http://semantic.eea.europa.eu/home/roug/eurostatdictionaries.rdf>
WHERE {
  ?obsUri e:species <http://eurostat.linked-statistics.org/dic/species#ALB>;
          e:pres <http://eurostat.linked-statistics.org/dic/pres#P00>, ?upresentation;
          e:dest <http://eurostat.linked-statistics.org/dic/dest#D0>;
          e:natvessr <http://eurostat.linked-statistics.org/dic/natvessr#TOTAL>;
          e:unit <http://eurostat.linked-statistics.org/dic/unit#TPW>, ?uunit;
          e:geo ?ucountry;
          e:time ?uyear;
          sdmx-measure:obsValue ?landed.
  ?ucountry skos:prefLabel ?country.
  ?uunit skos:prefLabel ?unit.
  ?uyear skos:prefLabel ?year.
  ?upresentation skos:prefLabel ?presentation.
} ORDER BY ?country ?year ?presentation

URIs for Eurostat identities

NameSpaces for Eurostat

  • Namespace for SDMX datasets : @prefix data: <http://eurostat.linked-statistics.org/data/> .

  • Namespace for Data Structure Definition (DSD) : @prefix dsd: <http://eurostat.linked-statistics.org/dsd/> .

  • Namespace for dictionaries : @prefix cl: <http://eurostat.linked-statistics.org/dic/> .

  • Namespace for dataset summaries is : @prefix dss: <http://eurostat.linked-statistics.org/dss#> .

  • Namespace for the concepts defined in DSDs : @prefix concept: <http://eurostat.linked-statistics.org/concept#> .

  • Namespace for the properties defined in DSDs : @prefix property: <http://eurostat.linked-statistics.org/property#> .

  • Namespace for titles of the datasets is : @prefix title: <http://eurostat.linked-statistics.org/title#> .

License

The software provided in this repository is Open Source.

To Do

  • Document the percentage of datasets that change per week, on average
  • Explore how to generate a per-country subset of the data
  • Load a .ie subset into data-gov.ie dataspace
  • Interlinking
    • Regions: DBpedia, Geonames, LinkedGeoData
    • National regions: Data-gov.ie, GeoLinkedData.es, Ordnance Survey
    • Indicators: US Census
    • Topics/Subjects: DBpedia

Pitfalls

There are few pitfalls in our current approach of converting eurostat datasets into RDF:

  • Some datasets have time period associated to an observation which is not a date but instead represented as LTAA (long term anual average), see dataset. Currently we dont know how to deal with LTAA in RDF because we dont have any extra information provided in the SDMX and DSD of that particular dataset. To deal with this case, our current solution provides a turtle file which contains the definition of LTAA and the time period for any particular observation value will be represented in RDF using that URI. For example, <> sdmx:timePeriod <http://eurostat.linked-statistics.org/misc>.
  • Some datasets have time period associated to an obervation in the following way : 1989_1993, see dataset. In the .tsv files, we dont have TIME_FORMAT value which actually tells if the observation value is for 1 year or X number of years. So for now, we are transforming values like 1989_1993 into 1989-01-01.
  • The FREQ value is missing in the .tsv files of all datasets, which is necessary to represent the observation values. In order to represent FREQ value for each observation value we extract the first FREQ value from the sdmx file of each dataset with the assumption that the FREQ value will remains same for all the observation values in that particular dataset.
  • Certain observation values are represented as -, e.g. see dataset. We assume these values to be 0 and replace values (i.e. -) with 0 in RDF.

Further resources

  • Eurostat has shapefiles for NUTS regions
  • NUTS-RDF is a browser for NUTS regions that has a nice map view attached. We have links to NUTS-RDF.
  • Linked NUTS is an excellent conversion of the NUTS codes to RDF, including the various versions of NUTS that existed over time.