Extraction of traffic status based on spatial-temporal trajectory reconstruction

2010 ◽  
Author(s):  
Qi Wang ◽  
Jianming Hu ◽  
Jiajie Zhang ◽  
Yi Zhang
Keyword(s):  
Trajectory Reconstruction ◽  
Temporal Trajectory

Trajectory reconstruction in the Earth Magnetosphere using TS05 model and evaluation of geomagnetic cutoff in AMS-02 data

2016 ◽  
Author(s):  
Davide Grandi ◽  
Bruna Bertucci ◽  
Matteo Boschini ◽  
Stefano Della torre ◽  
Matteo Duranti ◽  
...  
Keyword(s):  
Trajectory Reconstruction ◽  
The Earth ◽  
Geomagnetic Cutoff

A hybrid stochastic approach for offline train trajectory reconstruction

2020 ◽  
Author(s):  
Pier Giuseppe Sessa ◽  
Valerio De Martinis ◽  
Axel Bomhauer-Beins ◽  
Ulrich Alois Weidmann ◽  
Francesco Corman
Keyword(s):  
Stochastic Approach ◽  
Trajectory Reconstruction

scholarly journals A novel social distancing analysis in urban public space: A new online spatio-temporal trajectory approach

2021 ◽  
Vol 68 ◽  
pp. 102765
Author(s):  
Jie Su ◽  
Xiaohai He ◽  
Linbo Qing ◽  
Tong Niu ◽  
Yongqiang Cheng ◽  
...  
Keyword(s):  
Public Space ◽  
Urban Public Space ◽  
Social Distancing ◽  
Trajectory Approach ◽  
Spatio Temporal ◽  
Temporal Trajectory

Detection and source parameterization of small-energy fireball events in Western Alps with ground-based infrasonic arrays

2021 ◽  
Author(s):  
Giacomo Belli ◽  
Emanuele Pace ◽  
Emanuele Marchetti
Keyword(s):  
Western Alps ◽  
Apparent Velocity ◽  
Array Analysis ◽  
Small Energy ◽  
Small Aperture ◽  
Energy Estimation ◽  
Trajectory Reconstruction ◽  
Tnt Equivalent ◽  
Back Azimuth ◽  
Aperture Arrays

Summary We present infrasound signals generated by four fireball events occurred in Western Alps between 2016 and 2019 and that were recorded by small aperture arrays at source-to receiver distances < 300 km. Signals consist in a series of short-lived infrasonic arrivals that are closely spaced in time. Each arrival is identified as a cluster of detections with constant wave parameters (back-azimuth and apparent velocity), that change however from cluster to cluster. These arrivals are likely generated by multiple infrasonic sources (fragmentations or hypersonic flow) along the entry trajectory. We developed a method, based on 2D ray-tracing and on the independent optically determined time of the event, to locate the source position of the multiple arrivals from a single infrasonic array data and to reconstruct the 3D trajectory of a meteoroid in the Earth's atmosphere. The trajectories derived from infrasound array analysis are in excellent agreement with trajectories reconstructed from eyewitnesses reports for the four fireballs. Results suggest that the trajectory reconstruction is possible for meteoroid entries located up to ∼300 km from the array, with an accuracy that depends on the source-to-receiver distance and on the signal-to-noise level. We also estimate the energy of the four fireballs using three different empirical laws, based both on period and amplitude of recorded infrasonic signals, and discuss their applicability for the energy estimation of small energy fireball events ($\le 1{\rm{kt\,\,TNT\,\,equivalent}}$).

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