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Spatio-temporal Queries on Road Networks, Coding Based Methods

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Encyclopedia of GIS

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Synonyms

Spatial and spatio-temporal queries over moving objects; Spatio-temporal network coding

Definition

Coding-based techniques assign codes to intersections on road networks, so that shortest distance between intersections can be determined very quickly as Hamming distances (1950) between their codes. Conventional methods have been used when distances between objects are defined under the Euclidean metric, but coding-based methods are superior for join, range, intercept, and other spatial and spatiotemporal queries when distances are measured along the roads.

The coding is obtained by embedding the graph metric into a higher-dimensional space, such as a hypercube of a suitable dimension. As an example, Fig. 3 depicts the labels for nodes from the sample road network in Fig. 1, obtained using an isometric embedding of the road network into a hypercube of dimension 14.

Typical spatiotemporal range queries have the form “Find all objects that are in region R during a time interval [t...

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Author information

Authors and Affiliations

  1. University of California, Riverside, Riverside, CA, USA

    Sandeep Gupta & Chinya V. Ravishankar

Authors
  1. Sandeep Gupta
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  2. Chinya V. Ravishankar
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Editor information

Editors and Affiliations

  1. Minneapolis, Minnesota, USA

    Shashi Shekhar

  2. Rutgers Business School, Newark, New Jersey, USA

    Hui Xiong

  3. The University of Iowa Tippie College of Business, Iowa City, Iowa, USA

    Xun Zhou

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Gupta, S., Ravishankar, C.V. (2016). Spatio-temporal Queries on Road Networks, Coding Based Methods. In: Shekhar, S., Xiong, H., Zhou, X. (eds) Encyclopedia of GIS. Springer, Cham. https://doi.org/10.1007/978-3-319-23519-6_1330-2

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  • DOI: https://doi.org/10.1007/978-3-319-23519-6_1330-2

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  • Publisher Name: Springer, Cham

  • Online ISBN: 978-3-319-23519-6

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