Geoinformatics
Online ISSN : 1347-541X
Print ISSN : 0388-502X
ISSN-L : 0388-502X
Current issue
Showing 1-9 articles out of 9 articles from the selected issue
Cover (GEOINFORMATICS 2021 Vol32. No.3)
CONTENTS
2021 JSGI Achievement Award Report
Special Article
Research Note
  • Atsushi KAJIYAMA, Yoshinori YAJIMA, Kenichi ASAI
    Type: Research Note
    2021 Volume 32 Issue 3 Pages 65-77
    Published: September 25, 2021
    Released: September 25, 2021
    JOURNAL RESTRICTED ACCESS

    To extract the topographical characteristics of newly occurring slope collapses and landslides, it is necessary to perform geographic analysis based on topographical data before such calamities occur. However, topographical data are often not collected in such situations. In contrast, satellite images are regularly captured and can be used to obtain topographical data before such calamities occur. In this study, we compared the topographical data and orthophoto obtained from satellite images and aerial laser measurements of the plains and mountains in Hiroshima and Hyogo prefectures. From the analysis, it was observed from both the topographical data and orthophoto that the plain area had a residual of approximately 2 m. In contrast, some areas in the mountainous region had residuals of approximately 2 and 9 m.

    Download PDF (36059K)
  • ─Slope, Relative Relief and Stream Power Indices in the Region of the 2008 Iwate-Miyagi Nairiku Earthquake─
    Daisaku KAWABATA, Haruo KIMURA, Yasuhira AOYAGI
    Type: Research Note
    2021 Volume 32 Issue 3 Pages 79-88
    Published: September 25, 2021
    Released: September 25, 2021
    JOURNAL RESTRICTED ACCESS

    In the volcanic region, the topography of fault displacement is unclear, so it is necessary to develop new methods in addition to conventional methods such as aerial photo interpretation and field surveys. In this study, we developed SPI distribution maps using slope and flow accumulation to investigate how active structures are represented around the 2008 Iwate-Miyagi Nairiku Earthquake (Mw 6.9) site. The Stream Power Indices (SPI) distribution is not as suitable for extracting edges as the slope and relative relief distributions, but it can clearly represent the knickpoints caused by active tectonics and differential erosion in a river system.

    Download PDF (10913K)
Transactions
Obituary
Manuscript Submission Form, Guaranty, Membership Application Form, Editorial note
feedback
Top