2,347 Hits in 7.8 sec

Multi-scale Windowing over Trajectory Streams [chapter]

Kostas Patroumpas
2012 Lecture Notes in Computer Science  
polylines"• trace(): reconstructs a separate path per subwindow • trajectory(): yields seamless synopsis from multi-scaled segments  Result is a sequence of locations per object -Topological operators  ...  smoothly updated, gracefully compressed -Motion mining • trends and patterns at varying resolutions -Online multi-grained aggregates • speed, heading, … to analyze motion per trajectory -Advanced visualization  ... 
doi:10.1007/978-3-642-33999-8_35 fatcat:4sncwdwk4bhmbofvwz4mebf3ka

Multi-dimensional Query Authentication for On-line Stream Analytics

Xiangrui Chen, Gyoung-Bae Kim, Hae-Young Bae
2010 KSII Transactions on Internet and Information Systems  
To close this gap and solve the problem of OLSA query authentication while outsourcing data streams, we propose MDAHRB and MDAHB, two multi-dimensional authentication approaches.  ...  Research on On-line Stream Analytics (OLSA) is motivated by extending the data cube technology for higher multi-level abstraction on the low-level-abstracted data streams.  ...  The indices are implemented by extending the kd-tree, and were firstly applied to work for multi-dimensional queries.  ... 
doi:10.3837/tiis.2010.04.005 fatcat:wtawdvhflzbw7l7hrd7b4djmz4

Empirical validation of network learning with taxi GPS data from Wuhan, China [article]

Susan Jia Xu, Qian Xie, Joseph Y. J. Chow, Xintao Liu
2020 arXiv   pre-print
Results show that using only samples from one OD pair, the multi-agent inverse optimization method can learn network parameters such that forecasted travel times have a 0.23 correlation with the observed  ...  Using a controlled 2062-link network environment and different GPS data processing algorithms, an online monitoring environment is simulated using the real data over a 4-hour period.  ...  Trajectories are split into sequences using a time gap threshold of 300 seconds (5-min). D.  ... 
arXiv:1911.03779v2 fatcat:pdcns6ebxvb4ne4zpp3ckoasu4

Vehicle trajectory data warehouse

Nouha Arfaoui, Jalel Akaichi
2017 Proceedings of the Second International Conference on Internet of things, Data and Cloud Computing - ICC '17  
We present in this work a trajectory model related to the displacement of the herd, which allows the generation of trajectory data that is going to be stored into trajectory data warehouse.  ...  To facilitate their study we present the herd by a point so we focus on the moving points. Such supposition facilitates the modeling of the trajectory.  ...  The trajectory pattern mining visualizes a set of trajectories having some property (visiting the same sequence of places with similar travel times).  ... 
doi:10.1145/3018896.3056790 dblp:conf/iotdcc/ArfaouiA17 fatcat:5bv7pxja6jfktkgnormxqrg35a

Multi-scale window specification over streaming trajectories

Kostas Patroumpas
2013 Journal of Spatial Information Science  
With the advent of modern location-based services, processing such data mostly focuses on providing real-time response to a variety of user requests in continuous and scalable fashion.  ...  An important class of such queries concerns evolving trajectories that continuously trace the streaming locations of moving objects, like GPS-equipped vehicles, commodities with RFID's, people with smartphones  ...  In [12] , an abstract data model and query language were developed towards implementing a spatiotemporal DBMS extension where trajectories are considered as moving points.  ... 
doi:10.5311/josis.2013.7.132 fatcat:ra7ekv5m4rbyxc333d4cfvryze

Sensing for Mobile Objects [chapter]

Nicholas D. Larusso, Ambuj K. Singh
2012 Managing and Mining Sensor Data  
We discuss some of the common approaches used for tracking and examine some recent work which focuses specifically on tracking vehicles using a road network.  ...  future position, and (iii) mining, extracting interesting patterns from spatiotemporal data.  ...  [19] a random walk based approach for identifying popular paths with respect to a specific destination node.  ... 
doi:10.1007/978-1-4614-6309-2_10 fatcat:b6xsuttztrfcnk5grrxpnged3a

An Introduction to Sensor Data Analytics [chapter]

Charu C. Aggarwal
2012 Managing and Mining Sensor Data  
On the contrary, in this section, we chose different queries for all the approaches, and then discuss these approaches along with the queries.  ...  This requires the development of trajectory mining techniques, which can mine the GPS data for interesting social patterns.  ...  The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory  ... 
doi:10.1007/978-1-4614-6309-2_1 fatcat:pfbx566yfzgqpnjcuzonmxr23q

Semantic trajectories

Zhixian Yan, Dipanjan Chakraborty, Christine Parent, Stefano Spaccapietra, Karl Aberer
2013 ACM Transactions on Intelligent Systems and Technology  
trajectories enriched with segmentations and annotations.  ...  The core contribution of this paper lies in a Semantic Model and a Computation and Annotation Platform for developing a semantic approach that progressively transforms the raw mobility data into semantic  ...  In contrast to these largely piece-meal trajectory processing studies, our approach provides a holistic multi-layer trajectory computation platform for trajectory reconstruction.  ... 
doi:10.1145/2483669.2483682 fatcat:ppv7g6kihjattjmf7g6nb3txxy

TOST: A Topological Semantic Model for GPS Trajectories Inside Road Networks

Tao Wu, Jianxin Qin, Yiliang Wan
2019 ISPRS International Journal of Geo-Information  
To organize trajectory data is a challenging issue for both studies on spatial databases and spatial data mining in the last decade, especially where there is semantic information involved.  ...  The high-level semantic features of trajectory data exploit human movement interrelated with geographic context, which is becoming increasingly important in representing and analyzing actual information  ...  However, if a user focuses on group features, there may be queries like "extract the common path of several given trajectories".  ... 
doi:10.3390/ijgi8090410 fatcat:75gueb6iozbopouuapduotx3x4

Efficient video collection association using geometry-aware Bag-of-Iconics representations

Ke Wang, Enrique Dunn, Mikel Rodriguez, Jan-Michael Frahm
2017 IPSJ Transactions on Computer Vision and Applications  
We demonstrate our proposed BoI representation with two novel applications: (1) finding video sequences connecting adjacent landmarks and aligning reconstructed 3D models and (2) retrieving geometrically  ...  We then develop a data-driven framework for a fully unsupervised extraction of such representations.  ...  Authors' contributions All authors read and approved the final manuscript. Competing interests The authors declare that they have no competing interests. Publisher's Note  ... 
doi:10.1186/s41074-017-0034-3 fatcat:d2wsy7fcznatfg2pkr6n7lug54

A study on video data mining

V. Vijayakumar, R. Nedunchezhian
2012 International Journal of Multimedia Information Retrieval  
Data mining is a process of extracting previously unknown knowledge and detecting the interesting patterns from a massive set of data.  ...  Beginning with an overview of the video datamining literature, this paper concludes with the applications of video mining.  ...  Video abstraction Video Abstraction is a short summary of a long video having a set of stills or moving images selected and reconstructed from an original video with concise information about the content  ... 
doi:10.1007/s13735-012-0016-2 fatcat:xuuf3w3b2rfcxlyevzndz6v62e

Thiessen Polygons [chapter]

2017 Encyclopedia of GIS  
Definition Geographic information is inherently spatial and temporal. Geographic applications often demand an integrative approach to examine changes and interactions over space and time.  ...  Cross-References Fastest-Path Computation Graph Theory, Konigsberg Problem Nearest Neighbor Problem Routing Vehicles, Algorithms  ...  The star schema was extended in Han et al. (1998) to include spatial abstraction levels and dimensions.  ... 
doi:10.1007/978-3-319-17885-1_101387 fatcat:gzp2stwscbcf7eupd3h6eztjri

29th International Conference on Data Engineering [book of abstracts]

2013 2013 IEEE 29th International Conference on Data Engineering Workshops (ICDEW)  
Given a sequence of query locations, each associated with a set of desired activities, an activity trajectory similarity query (ATSQ) returns $k$ trajectories that cover the query activities and yield  ...  This leads to a query optimization approach for kGPM processing, and a top-k algorithm to process kGPM with the optimal query plan.  ...  VolUnTeers ICDE-13 would like to extend our warm appreciation to our conference volunteers who assisted before, during and after the conference, to help make sure that everyone enjoys a great conference  ... 
doi:10.1109/icdew.2013.6547409 fatcat:wadzpuh3b5htli4mgb4jreoika

Event Processing and Real-Time Monitoring over Streaming Traffic Data [chapter]

Kostas Patroumpas, Timos Sellis
2012 Lecture Notes in Computer Science  
At a second step, we design a framework for effective multi-modal dissemination of derived information to the end users, in the form of interactive maps for intuitive visualization as well as instant notifications  ...  Tracking mobility of humans, animals or merchandise has recently given rise to a wide variety of location-based services and monitoring applications.  ...  We would like to thank M.Sc. students Kyriakos Georgoussis and Chrysaida Papadopoulou for their collaboration in developing demo applications for online toll charges and shortest paths over this framework  ... 
doi:10.1007/978-3-642-29247-7_10 fatcat:bbyygt3eujde3ejzlunvzsdrca

Program book

2010 2010 IEEE 26th International Conference on Data Engineering Workshops (ICDEW 2010)  
IQ P -a novel approach to bridge the gap between usability of keyword search and expressiveness of database queries.  ...  As a proof-of-concept, we implemented T-Warehouse, a system that incorporates all the required steps for Visual Trajectory Data Warehousing, from trajectory reconstruction and ETL processing to Visual  ...  within the variety of "social media" (photos, blogs, videos, maps, games, etc.) exploiting the number of interaction paths available, engineering of the mining algorithms required to deal with the underlying  ... 
doi:10.1109/icdew.2010.5452773 fatcat:oyq2tujbvjfpxjlyixux5q57vu
« Previous Showing results 1 — 15 out of 2,347 results