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 …

Location-based services (LBS) have been widely accepted by mobile users. Many LBS
users have direction-aware search requirement that answers must be in the search …

In spatio-temporal applications, moving objects detect their locations via location-aware
devices and update their locations continuously to the server. With the ubiquity and massive …

The volume of spatio-temporal data is growing at a rapid pace due to advances in location-
aware devices, eg, smartphones, and the popularity of location-based services, eg …

We are moving towards 'smart'world in which industries, such as healthcare, smart cities,
transportation, and agriculture have started using IoT (Internet of Things). These applications …

Location-based recommendation services recommend objects to the user based on the
user's preferences. In general, the nearest objects are good choices considering their spatial …

Traditional location-based services recommend nearest objects to the user by considering
their spatial proximity. However, an object not only has its distance but also has its direction …

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 …

To facilitate a variety of indoor applications, positioning technologies have been developed
in indoor spaces (such as WI-FI and RFID). Thus, the requirement for the tracking and …

The ever-increasing volume of trajectories of moving objects and the diversity of intelligent
transportation systems and location-based services that rely on spatio-temporal data of …