## Abstract

Consider a set of points P in space with at least some of the pairwise distances specified. Given this set P, consider the following three kinds of queries against a database D of points: (i) pure constellation query: find all sets S in D of size |P| that exactly match the pairwise distances within P up to an additive error ϵ; (ii) isotropic constellation queries: find all sets S in D of size |P| such that there exists some scale factor f for which the distances between pairs in S exactly match f times the distances between corresponding pairs of P up to an additive ϵ; (iii) non-isotropic constellation queries: find all sets S in D of size |P| such that there exists some scale factor f and for at least some pairs of points, a maximum stretch factor m_{i} _{, j} > 1 such that (f × m_{i} _{, j} ×dist(pi, pj))+ϵ > dist(si,sj) >(f × dist(pi, pj)) - ϵ. Finding matches to such queries has applications to spatial data in astronomical, seismic, and any domain in which (approximate, scale-independent) geometrical matching is required. Answering the isotropic and non-isotropic queries is challenging because scale factors and stretch factors may take any of an infinite number of values. This paper proposes practically efficient sequential and distributed algorithms for pure, isotropic, and non-isotropic constellation queries. As far as we know, this is the first work to address isotropic and non-isotropic queries.

Original language | English (US) |
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Title of host publication | Scientific and Statistical Database Management - 30th International Conference, SSDBM 2018, Proceedings |

Editors | Michael Bohlen, Johann Gamper, Peer Kroger, Dimitris Sacharidis |

Publisher | Association for Computing Machinery |

ISBN (Electronic) | 9781450365055 |

DOIs | |

State | Published - Jul 9 2018 |

Event | 30th International Conference on Scientific and Statistical Database Management, SSDBM 2018 - Bolzano-Bozen, Italy Duration: Jul 9 2018 → Jul 11 2018 |

### Publication series

Name | ACM International Conference Proceeding Series |
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### Other

Other | 30th International Conference on Scientific and Statistical Database Management, SSDBM 2018 |
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Country/Territory | Italy |

City | Bolzano-Bozen |

Period | 7/9/18 → 7/11/18 |

## Keywords

- Big Data
- Distance Matching
- Geometrical Patterns
- Isotropic
- Pattern Search
- Point set Registration
- Spatial Patterns

## ASJC Scopus subject areas

- Software
- Human-Computer Interaction
- Computer Vision and Pattern Recognition
- Computer Networks and Communications