Multiversion Accesses to Spatio-Temporal Data based on Multiple-Time

Multiversion Linear Quadtree for Spatio-Temporal Data

Research in spatio-temporal databases has largely focused on extensions of access methods for the proper handling of time changing spatial information. In this paper, we present the Multiversion Linear Quadtree (MVLQ), a spatio-temporal access method based on Multiversion B-trees (MVBT) [2], embedding ideas from Linear Region Quadtrees [4]. More specifically, instead of storing independent nume...

Temporal and spatio-temporal aggregations over data streams using multiple time granularities

Temporal and spatio-temporal aggregations are important but costly operations for applications that maintain time-evolving data (data warehouses, temporal databases, etc.). In this paper we examine the problem of computing such aggregates over data streams. The aggregates are maintained using multiple levels of temporal granularities: older data is aggregated using coarser granularities while m...

Temporal and Spatio - Temporal Aggregations over Data Streams usingMultiple Time

Spatio-temporal precipitation modeling based on time-varying regressions

A time-varying regression model is considered, based on monthly precipitation data from gauge measurements. The model accounts for orographic effects, that is elevation and aspect of the terrain. The study area is NCDC climate division 2 in a mountainous area in northern New Mexico. We assess spatio-temporal variability and also trace the dependence of precipitation on El Niño/Southern Oscillat...

Land Subsidence Spatio-temporal Variation Analysis Based on Multiple Source Data Field in Tianjin, China

Land Subsidence is a kind of slow evolution geological hazards which needs effective way to monitor. The causal and developmentsof land subsidence are complex. The monitor of land subsidence is also difficulty. So it is hard to analyze it in independent data source. This paper uses multiple source data to extract the high temporal and spatial resolution result. The deformations of land surface ...