A general map matching algorithm for transport telematics applications   总被引：8，自引：0，他引：8  

Mohammed?A.?Quddus  Washington?Yotto?OchiengEmail author  Lin?Zhao  Robert?B.?Noland 《GPS Solutions》2003,7(3):157-167

This paper describes a map-matching algorithm designed to support the navigational functions of a real-time vehicle performance and emissions monitoring system currently under development, and other transport telematics applications. The algorithm is used together with the outputs of an extended Kalman filter formulation for the integration of GPS and dead reckoning data, and a spatial digital database of the road network, to provide continuous, accurate and reliable vehicle location on a given road segment. This is irrespective of the constraints of the operational environment, thus alleviating outage and accuracy problems associated with the use of stand-alone location sensors. The map-matching algorithm has been tested using real field data and has been found to be superior to existing algorithms, particularly in how it performs at road intersections.  相似文献   

Special Contribution: An Overview of Recent Seismic Refraction Experiments in Central Europe     

Guterch  A.  Grad  M.  Špičák  A.  Brückl  E.  Hegedüs  E.  Keller  G.R.  Thybo  H. 《Studia Geophysica et Geodaetica》2003,47(3):651-657

Studia Geophysica et Geodaetica -  相似文献   

Special Contribution: SUDETES 2003 Seismic Experiment     

Grad  M.  Špičák  A.  Keller  G.R.  Guterch  A.  Brož  M.  Hegedüs  E. 《Studia Geophysica et Geodaetica》2003,47(3):681-689

Studia Geophysica et Geodaetica -  相似文献   

Interaction of an Erupting Filament with the Ambient Magnetoplasma and Escape of Electron Beams     

Vršnak  Bojan  Warmuth  Alexander  Maričić  Darije  Otruba  Wolfgang  Ruždjak  Vladimir 《Solar physics》2003,217(1):187-198

A huge filament eruption of 12 September 2000 associated with a two-ribbon spotless flare is described. During the acceleration phase the shape of the filament changed, and signatures of topological restructuring of large-scale coronal magnetic fields were inferred by tracking changes of nearby coronal holes. At the same time electron beams associated with the flare impulsive phase escaped into interplanetary space. Based on the time–spatial relationships a hypothesis is put forward, according to which the reconnection between the arcade magnetic field and the ambient field provides a temporary link between the open field lines and the flare energy release site, enabling the escape of electron beams into interplanetary space.  相似文献   

Zur Frage der Nebelfrostablagerungen im Gebirge     

Mikuláš Konček 《Studia Geophysica et Geodaetica》1960,4(1):69-84

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Confidence regions in Helmert transformation     

Lubomír Kubáček 《Studia Geophysica et Geodaetica》1966,10(2):124-136

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Alternatives to the Global Warming Potential for Comparing Climate Impacts of Emissions of Greenhouse Gases   总被引：7，自引：3，他引：4  

Keith?P.?ShineEmail author  Jan?S.?Fuglestvedt  Kinfe?Hailemariam  Nicola?Stuber 《Climatic change》2005,68(3):281-302

The Global Warming Potential (GWP) is used within the Kyoto Protocol to the United Nations Framework Convention on Climate Change as a metric for weighting the climatic impact of emissions of different greenhouse gases. The GWP has been subjected to many criticisms because of its formulation, but nevertheless it has retained some favour because of the simplicity of its design and application, and its transparency compared to proposed alternatives. Here, two new metrics are proposed, which are based on a simple analytical climate model. The first metric is called the Global Temperature Change Potential and represents the temperature change at a given time due to a pulse emission of a gas (GTP_P); the second is similar but represents the effect of a sustainedemission change (hence GTP_S). Both GTP_P and GTP_S are presented as relative to the temperature change due to a similar emission change of a reference gas, here taken to be carbon dioxide. Both metrics are compared against an upwelling-diffusion energy balance model that resolves land and ocean and the hemispheres. The GTP_P does not perform well, compared to the energy balance model, except for long-lived gases. By contrast, the GTP_S is shown to perform well relative to the energy balance model, for gases with a wide variety of lifetimes. It is also shown that for time horizons in excess of about 100 years, the GTP_S and GWP produce very similar results, indicating an alternative interpretation for the GWP. The GTP_S retains the advantage of the GWP in terms of transparency, and the relatively small number of input parameters required for calculation. However, it has an enhanced relevance, as it is further down the cause–effect chain of the impacts of greenhouse gases emissions and has an unambiguous interpretation. It appears to be robust to key uncertainties and simplifications in its derivation and may be an attractive alternative to the GWP.  相似文献   

On the effect of lava viscosity on the magnetic fabric intensity in alkaline volcanic rocks     

F. Hrouda  M. Chlupáčová  K. Schulmann  J. Šmíd  P. Závada 《Studia Geophysica et Geodaetica》2005,49(2):191-212

The degree of the anisotropy of magnetic susceptibility (AMS) of basaltic rocks, as is known from the large AMS database of these rocks, is generally very low, while in more acidic volcanic rocks such as andesites, trachytes and phonolites, which have been investigated much less frequently, it is in general much higher. In the present study, the AMS of various volcanic rocks including trachytic and phonolitic rocks was investigated in the Tertiary volcanic region of the eské stedohoí Mts. Viscosities of the respective lavas were calculated from the chemical composition using the KWARE program. A rough correlation was found between the degree of AMS and lava viscosities, probably resulting from different mechanisms orienting the magnetic minerals. In basaltic lava flows this mechanism is traditionally considered to be of a hydrodynamic nature, in trachytic and phonolitic bodies it can also be represented by quasi-intrusive flows resembling, at least partially, ductile flow deformation. This is in agreement with the AMS data predicted by the viscous (liquid flow) and line/plane (ductile flow) models.  相似文献   

Undead earthquakes   总被引：1，自引：0，他引：1  

R.?M.?W.?MussonEmail author 《Journal of Seismology》2005,9(1):111-114

This short communication deals with the problem of fake earthquakes that keep returning into circulation. The particular events discussed are some very early earthquakes supposed to have occurred in the U.K., which all originate from a single enigmatic 18th century source.  相似文献   

Heat-capacity measurements and absolute entropy of ɛ-Mg2PO4OH     

Catherine Leyx  J. Cornelis Van Miltenburg  Christian Chopin  Lado Cemič 《Physics and Chemistry of Minerals》2005,32(1):13-18

The low-temperature heat capacity of -Mg₂PO₄OH was measured between 10 and 400 K by adiabatic calorimetry. No phase transition was observed over this temperature range. A relative enthalpy increment of 22,119 J mol^–1 and an absolute entropy value of 127.13±0.25 J mol^–1 K^–1 at 298.15 K are derived from the results. The low-temperature heat-capacity data are compared with the DSC data obtained from 143 K to 775 K and show marginal differences in the common temperature range. The latter data are fitted by the polynomial which allows extrapolation to high temperatures.Software information: WINDOWS operating system, WORD word processing, SigmaPlot diagrams exported in tiff format.  相似文献