Spatial relationships are core components in the design and definition of spatial queries. A
spatial relationship determines how two or more spatial objects are related or connected in …

Spatial information retrieval is a common task of digital ecosystems due to the popularity of
collecting and storing spatial information and phenomena in the world of the Internet of …

Service recommendation systems have been trying to utilize context-aware information to
recommend services that better meet the needs of the service consumers. However, current …

Continuous K-nearest neighbor (CKNN) queries on moving objects retrieve the K-nearest
neighbors of all points along a query trajectory. They mainly deal with the moving objects …

Finding and recommending suitable services for mobile devices are increasingly important
due to the popularity of mobile Internet. While recent research has attempted to use role …

Recommendation techniques greatly promote the development of online service in the
interconnection environment. Personalized recommendation has attracted researchers' …

Although the direction aspect is as important as the distance aspect when retrieving spatial
objects, the studies of direction-aware queries are limited. The direction-based surrounder …

This paper proposes a new spatial query called a reverse direction-based surrounder
(RDBS) query, which retrieves a user who is seeing a point of interest (POI) as one of their …

A direction-aware augmented spatial keyword top-query (DAT) returns the top-objects based
on a ranking function that considers spatial distance, textual similarity, query numeric …

We consider the problem of indexing the complete OpenStreetMap planet data set (> 500GB
of raw data) to support complex queries involving both text search as well as context-aware …