Geoinformatics
Online ISSN : 1347-541X
Print ISSN : 0388-502X
ISSN-L : 0388-502X
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Volume 33, Issue 1
Displaying 1-6 of 6 articles from this issue
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Cover (GEOINFORMATICS 2022 Vol33. No.1)
CONTENTS
Article
  • Graphic Expression of Time Range of Species and Chronological Ordering: Proposal and Application of Coordinate Diagram
    Kumiko YAMAGUCHI, Kiyoji SHIONO
    Article type: Article
    2022 Volume 33 Issue 1 Pages 3-12
    Published: March 25, 2022
    Released on J-STAGE: March 25, 2022
    DOIhttps://doi.org/10.6010/geoinformatics.33.1_3
    JOURNAL FREE ACCESS
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    We propose a new graphical expression to show time ranges of species and their chronological relations. Let So be the set of species forming a higher rank of taxon Σ that lived in the true range T in time. Information that a species appeared at t=a and became extinct at t=b is represented by a point (a, b) on a two-dimensional coordinate diagram where the abscissa and the ordinate denote the appearance time and the extinction time, respectively. The coordinate diagram provides a new method to show time ranges of species in So on one diagram and further to represent the chronological relation of time ranges as a directed graph. As an application example, an algorithm is proposed to select a subset S of So such that S satisfies two constrains: (1) S is a totally ordered under the chronological relation and (2) at least one species lived at any time within T. The algorithm guarantees the existence of a subset S satisfying two constraints.

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