Data aggregation in Geographic Information Systems (GIS) is a desirable feature, only
marginally present in commercial systems nowadays, mostly through ad hoc solutions. We …

This paper presents GeoTrend; a system for scalable support of spatial trend discovery on
recent microblogs, eg, tweets and online reviews, that come in real time. GeoTrend is …

Large volumes of geospatial data are being published on the Semantic Web (SW), yielding
a need for advanced analysis of such data. However, existing SW technologies only support …

Abstract Geographic Information Systems (GIS) have been extensively used in various
application domains, ranging from economical, ecological and demographic analysis, to city …

Temporal aggregation is a crucial operator in temporal databases and has been studied in
various flavors, including instant temporal aggregation (ITA) and span temporal aggregation …

In the last years, extending OLAP (On-Line Analytical Processing) systems with spatial and
temporal features has attracted the attention of the GIS (Geographic Information Systems) …

Time is a vital facet of every human activity. Data warehouses, which are huge repositories
of historical information, must provide analysts with rich mechanisms for managing the …

Studying trajectories of individuals has received growing interest. The aggregated
movement behaviour of people provides important insights about their habits, interests, and …

This chapter is concerned with multidimensional data models for spatial data warehouses.
Over the last few years different approaches have been proposed in the literature for …

In this paper we discuss how data warehousing technology can be used to store aggregate
information about trajectories and perform OLAP operations over them. To this end, we …