An efficient grid-based k-prototypes algorithm for sustainable decision-making on spatial objects

Hong Jun Jang, Byoungwook Kim, Jongwan Kim, Soon Young Jung

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Data mining plays a critical role in sustainable decision-making. Although the k-prototypes algorithm is one of the best-known algorithms for clustering both numeric and categorical data, clustering a large number of spatial objects with mixed numeric and categorical attributes is still inefficient due to complexity. In this paper, we propose an efficient grid-based k-prototypes algorithm, GK-prototypes, which achieves high performance for clustering spatial objects. The first proposed algorithm utilizes both maximum and minimum distance between cluster centers and a cell, which can reduce unnecessary distance calculation. The second proposed algorithm as an extension of the first proposed algorithm, utilizes spatial dependence; spatial data tends to be similar to objects that are close. Each cell has a bitmap index which stores the categorical values of all objects within the same cell for each attribute. This bitmap index can improve performance if the categorical data is skewed. Experimental results show that the proposed algorithms can achieve better performance than the existing pruning techniques of the k-prototypes algorithm.

Original languageEnglish
Article number2614
JournalSustainability (Switzerland)
Issue number8
Publication statusPublished - 2018 Jul 25

Bibliographical note

Publisher Copyright:
© 2018 by the authors.


  • Clustering
  • Data mining
  • Grid-based k-prototypes
  • Spatial data
  • Sustainability

ASJC Scopus subject areas

  • Computer Science (miscellaneous)
  • Environmental Science (miscellaneous)
  • Geography, Planning and Development
  • Energy Engineering and Power Technology
  • Hardware and Architecture
  • Management, Monitoring, Policy and Law
  • Computer Networks and Communications
  • Renewable Energy, Sustainability and the Environment


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