Temporal Aggregation Effects in Spatiotemporal Traffic Modelling

Modelling Spatiotemporal Information: The Spatiotemporal Object Model

Many of the data-models developed for temporal databases are extensions of existing non-temporal models. However, to create models which complies as much as possible with the behaviour of phenomena in the real world, we have suggested using an ontological approach using conceptual modelling techniques. The spatiotemporal object model (STOM) introduced in this article is developed using object-o...

Temporal Aggregation

Effects of temporal modelling on the statistical uncertainty of spatiotemporal distributions estimated directly from dynamic SPECT projections.

Artefacts can result when reconstructing a dynamic image sequence from inconsistent single photon emission computed tomography (SPECT) projection data acquired by a slowly rotating gantry. The artefacts can lead to biases in kinetic parameters estimated from time-activity curves generated by overlaying volumes of interest on the images. Insufficient sampling and truncation of projections by con...

Examining Extreme Weather Effects on Birth Weight From the Individual Effect to Spatiotemporal Aggregation Effects

Extreme weather events are related to low birth weight. Monitoring this relationship in the context of climate change has a wide range of public health implications, as birth weight is a key indicator of many life course health outcomes, and climate change increases both frequency and intensity of extreme weather events. However, most birth weight data are not available with sufficient spatial ...

Spatiotemporal Interpolation for Environmental Modelling

A variation of the reduction-based approach to spatiotemporal interpolation (STI), in which time is treated independently from the spatial dimensions, is proposed in this paper. We reviewed and compared three widely-used spatial interpolation techniques: ordinary kriging, inverse distance weighting and the triangular irregular network. We also proposed a new distribution-based distance weightin...