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What and Who
Title:Data Models and Query Languages for Linked Spatiotemporal Data
Speaker:Manolis Koubarakis
coming from:Dept. of Informatics and Telecommunications National and Kapodistrian University of Athens
Speakers Bio:Manolis Koubarakis is a Professor in the Dept. of Informatics and
Telecommunications, National and Kapodistrian University of Athens. He
is also an Adjunct Researcher at
the Institute of the Management of Information Systems (IMIS) of the
“Athena” Research and Innovation Center. He is a Fellow of EurAI
(European Association for Artificial
Intelligence). He has published more than 170 papers that have been
widely cited in the areas of Artificial Intelligence (especially
Knowledge Representation), Databases,
Semantic Web and Linked Data. His research has been financially
supported by the European Commission (projects CHOROCHRONOS, DIET,
BRIDGEMAP, Evergrow, OntoGrid,
SemsorGrid4Env, TELEIOS, Optique, LEO, MELODIES, WDAqua and
BigDataEurope), the Greek General Secretariat for Research and
Technology (more recently through the Research
Excellence Grant SCARE), the European Space Agency (project Prod-Trees)
and industry sources (Microsoft Research and British
Telecommunications). He recently co-chaired
the European Data Forum 2014 (, the top
European event aiming towards the development of a strong data economy
in Europe. He has co-ordinated
the well-known projects TELEIOS ( and
LEO ( which developed tools for linked Earth
Observation data and linked
geospatial data, and applied them to the development of environmental
and commercial applications. Manolis’ team has also developed the linked
data infrastructure of
project MELODIES ( which studied how to
exploit linked open data in a variety of environmental applications.
Manolis currently participates
in the project BigDataEurope (, a
European effort in the area of Big Data with application scenarios in
all societal challenges of the
Horizon 2020. He also participates in the project WDAqua
(, Answering Questions using Web Data), a Marie
Sklodowska-Curie Innovative Training Network.
Finally, he also participates in the project Copernicus App Lab
( ) which will make Copernicus services data
available as linked data to aid the
development of applications by mobile developers.
Event Type:Colloquium Lecture
Visibility:D1, D2, D3, D4, D5, SWS, RG1, MMCI
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Level:Public Audience
Date, Time and Location
Date:Tuesday, 27 June 2017
Duration:60 Minutes
Building:E1 4
In this talk I will survey the area of data models and query languages
for linked spatiotemporal
data as it has been developed by my group and others in the last few years.
I will start by introducing ways to extend RDF and SPARQL with definite
temporal and geospatial information
(in particular, the model stRDF and stSPARQL and the OGC standard
GeoSPARQL). Then, I will discuss how to
extend RDF with the ability to represent indefinite information using
constraints. Following ideas from
the incomplete information literature, I will develop a semantics for
this extension of RDF, called RDFi,
and study query evaluation for SPARQL over RDFi databases. Then, I will
discuss and compare implemented systems for
these RDF extensions. Finally, I will discuss open problems and point
out directions for future research.
Name(s):Petra Schaaf
EMail:--email address not disclosed on the web
Video Broadcast
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Created by:Petra Schaaf/AG5/MPII/DE, 06/22/2017 11:25 AMLast modified by:halma/MPII/DE, 11/28/2017 07:21 PM
  • Petra Schaaf, 06/22/2017 11:28 AM -- Created document.