new advances in geomatics and communications technologies are enabling the development of automated auscultation system for structure monitoring. in particular, differential gps (dgps) technique allows real-time monitoring of structures with millimetre accuracy after an appropriate mathematical treatment. the results of real-time dgps monitoring of a pilot dam over 15 months are presented and c...

The augmentation of DGPS with ground-based GPS transmitters (pseudolites, or PLs) was investigated. A simulation analysis was conducted to determine the effects of PL augmentation on DGPS availability, accuracy and reliability measures, using various constant mask angles and a " real-world " horizon (measured at Lake Okanagan, British Columbia) plus a simulated obstruction. Field tests in the m...

This paper presents a framework to obtain pseudo lane-level positioning using low-cost GPS and driving event detection within the environment of vehicle-toinfrastructure (v2i) communication. In this context, pseudo means that lane level accuracy is achieved only under the assumption that v2i is available and there is no GPS outage. GPS errors can be categorized into common-mode errors and nonco...

Cell-to-cell variability (noise) is an important feature of gene expression that impacts cell fitness and development. The regulatory mechanism of this variability is not fully understood. Here we investigate the effect on gene expression noise in divergent gene pairs (DGPs). We generated reporters driven by divergent promoters, rearranged their gene order, and probed their expressions using ti...

Automatic image measuring is to identify and to measure conjugate points in two or more overlapping photographs automatically. In digital photogrammetry, this process is done by image matching. A straightforward way to make image matching well-posed is to restrict the space of possible solutions and provide good initial parallax. Initial parallax is related to the searching space. The better th...

For many years, real-time DGPS and RTK correction data distribution have been providing GPS users a means to accomplish their tasks with high accuracy positioning in real-time. Dial-up systems over phone line or local area network (LAN) enable users to download data from base stations at remote locations. Radio modems provides wireless communication links between a base station and a rover to e...

The introduction of the Global Positioning System (GPS) ushered in a new era of affordable precise navigation. Differential GPS (DGPS) corrections have reduced positioning errors from about 100 meters to roughly 1 meter, which has led to their proposed use in aircraft precision approach. However, the accuracy of differential corrections is somewhat limited by spatial and temporal decorrelation ...

In our study, we analyzed the combined standard uncertainty of water table slope assessment done using differential global positioning system (DGPS)-based measurements of water table elevation and distances between measurement locations. We compared and discussed uncertainties in water table slope assessments done in various hypothetical environments of lowland floodplains (water table slopes t...

A novel method of map matching using the Global Positioning System (GPS) has been developed for civilian use, which uses digital mapping data to infer the <100 meters systematic position errors which result largely from “selective availability” (S/A) imposed by the U.S. military. A method of rapidly detecting inappropriate road centrelines from the set of all possible road centre-lines that a v...