Map, Journal of the Japan Cartographers Association
Online ISSN : 2185-646X
Print ISSN : 0009-4897
ISSN-L : 0009-4897
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Volume 57, Issue 3
Displaying 1-8 of 8 articles from this issue
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Original Article
  • Techniques to secure precision of the open traverse surveying of Ino Tadataka
    Michio Nogami
    2019 Volume 57 Issue 3 Pages 1-13
    Published: September 30, 2019
    Released on J-STAGE: July 21, 2021
    DOIhttps://doi.org/10.11212/jjca.57.3_1
    JOURNAL FREE ACCESS
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    It is the purpose of this paper to evaluate accuracy of Ino Maps, Daizu of scale 1/36000 made in the early stage of his works. Ino surveyed coastlines of almost whole Japanese Islands by the method Dosenho, a kind of open traverse surveying. He made maps not only by the surface surveying (Dosen-ho) but also by astronomical observations to elevation angles of stars crossing the meridian.

    This author checked the relative positional differences in the latitude and longitude between points of Ino maps of Daizu and those of actual precise maps prepared by the Geographical Survey Institute (Geospacial Information Authority nowadays). It becomes clear how Ino corrected results of surface surveying on the basis of astronomical observations. However he made many times aspect measurements to mountaintops or the other conspicuous marks, the results were not used for position corrections at the least. The closed traverse method was partially adopted for some peninsulas, but the effectiveness was not found to be clear.

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