Open Government Data: A European Perspective - Information and Communication Technologies in Public Administration - page 15

table 1.2 Classification Categories for Catalogues

Business information: includes Chamber of Commerce information, official
business registers, patent and trademark information, and public tender
databases

Geographic information: includes address information, aerial photos,
buildings, cadastral information, geodetic networks, geology, hydrographic
data, and topographic information

Legal information: includes decisions of national, foreign, and international
courts; national legislation; and treaties

Meteorological information: includes climate data and models and weather
forecasts

Social data: include various types of statistics (economic, public spending,
employment, health, population, public administration, social)

Transport information: includes information on traffic congestion, road works,
public transport, and vehicle registration

Source: EC (2003). Directive 2003/98/EC of the European Parliament and of the
Council of 17 November 2003 on the re-use of public sector information .
Retrieved July 2, 2014, from http://ec.europa.eu/information_society/policy
/psi/docs/pdfs/directive/psi_directive_en.pdf.

◾ Number of data: This indicates the total volume of data available in each

OGD portal.

◾ Number of agencies: This indicates the total number of agencies providing

data to the OGD portal.

◾ Number of filters: This indicates the total number of filters that can be used

simultaneously to refine an information search in an OGD portal.

◾ Types of filters: Alexopoulos et al. (2013) observed that an OGD portal

should enable searching with filters but did not analyze the different types of
ilters available. herefore, in this topic, we examined the 11 ilters most com-
monly applied: category, subcategory, agency, tag, format, license, linked,
geography, date, keyword, and other.

1.5 Sample
The European Digital Agenda, which forms part of the Europe 2020 strategy, is a
landmark event in the area of policies for open data and the reuse of PSI in the EU
(EC, 2011). In this vein, in 2011, the European Commission published the communi-
cation “Open Data: An Engine for Innovation, Growth and Transparent Governance”
(EC, 2011). Accordingly, and taking into account the commitment made by the EU
in the field of open data, we decided to analyze the present state of OGD in Europe.