With the proliferation of mobile devices, large collections of geospatial data are becoming
available, such as geo-tagged photos. Map rendering systems play an important role in …

The massive adoption of smart phones and other mobile devices has generated humongous
amount of spatial and spatio-temporal data. The importance of spatial analytics and …

One major goal of spatial query processing is to mitigate I/O costs and minimize the search
space. However, geometric computation can be heavy-duty for spatial queries, in particular …

Geometric computation can be heavy duty for spatial queries, in particular for complex
geometries such as polygons with many edges based on a vector-based representation …

Managers spend a majority of their days in face-to-face meetings so it is not surprising that
meeting support is becoming an important focus of information technology. But meetings …

This paper studies the spatial group-by query over complex polygons. Given a set of spatial
points and a set of polygons, the spatial group-by query returns the number of points that lie …

Pandemic measures such as social distancing and contact tracing can be enhanced by
rapidly integrating dynamic location data and demographic data. Projecting billions of …

In this paper we focus on a pictorial query language, referred to as Geographical Pictorial
Query Language (GeoPQL), and we revise its formal semantics by considering the polygon …

We present the design and implementation of a component for the preprocessing of position
data taken from moving objects. The movement of mobile objects is represented by …

Approximation techniques for spatial data traditionally concern data capture and data
representation issues. On the other hand, more recently developed approximation …