Journal of The Japan Forest Engineering Society
Online ISSN : 2189-6658
Print ISSN : 1342-3134
ISSN-L : 1342-3134
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Volume 14, Issue 2
Displaying 1-6 of 6 articles from this issue
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Article
  • Evaluating temporal changes in sediment distribution and travel distances from forest roads by a PC-based imagery analysis with digital orthophoto data
    Masami SHIBA, Tomoaki ISHIKAWA
    Article type: Article
    1999 Volume 14 Issue 2 Pages 75-84
    Published: August 15, 1999
    Released on J-STAGE: April 03, 2017
    DOIhttps://doi.org/10.18945/jjfes.KJ00007484683
    JOURNAL OPEN ACCESS
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    Many studies have identified forest roads as major non-point source impact contributors of sediment resulting from forest activities in a mountainous environment. Thus, sediment deposits on slopes below roads have made an important environmental issue in management approaches to riparian zones because of the numerous ecological linkage between terrestrial and aquatic ecosystems. This paper demonstrates a PC-based imagery data processing system using digital orthophoto throughout the application to estimate the granitic sediment deposits eroded from constructed roads on watersheds in the mountains of Shiga Prefecture. The results showed the same trends in sediment yield as earlier studies, it was documented that large areas of sediment deposits during the earlier years after road construction were followed by a rapid reduction in deposits in subsequent years. Also, a relationship was developed to describe the percent in area of the sediment accumulated on the slope in relation to the travel distance in travel.
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  • Current problems of consensus building between forest owners in forest road planning
    Takeshi MATSUMOTO, Katsuhiro KITAGAWA
    Article type: Article
    1999 Volume 14 Issue 2 Pages 85-94
    Published: August 15, 1999
    Released on J-STAGE: April 03, 2017
    DOIhttps://doi.org/10.18945/jjfes.KJ00007484684
    JOURNAL OPEN ACCESS
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    We investigated the process in planning a forest road network by using a questionnaire, and the factors preventing the development of a regional forest road network in 46 municipalities in 10 forestry areas on the Pacific side of central Japan was analyzed. The following points were clarified: (1) Most municipality offices recognized the lack of and desire for more forest roads. (2) It is difficult to reach a consensus on road construction between forest owners because of complex relationships and their different points of view. (3) In particular, the existence of the beneficiaries' obligatory payment, or the lack of compensation for the loss of property or trees during road construction makes it difficult to build a consensus. (4) Many of the municipality offices that do have jurisdic-tion over road construction tend to rely on forest owners for consensus building, and the lack of publicity on the need for forest roads is a shortcoming of the conventional consensus building system.
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  • The development of the digital orthophoto generating system using personal computer.
    Akemi ITAYA, Tadahisa YAMAZAKI
    Article type: Article
    1999 Volume 14 Issue 2 Pages 95-100
    Published: August 15, 1999
    Released on J-STAGE: April 03, 2017
    DOIhttps://doi.org/10.18945/jjfes.KJ00007484685
    JOURNAL OPEN ACCESS
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    The analysis of an orthophoto is effective for the classification of land cover in the large forest area. However, now the making of an orthophoto needs professional techniques, special equipment and much time. Therefore, it is expensive. In this study, we examined the generating of a digital orthophoto by the simple system using a personal computer and the developed programs. The generating time on this system was about 8 hours. It was a short time although it processed a lot of data. In addition, the comparison with the contour map showed that the average of error was 4.24 m. It was high accuracy in spite of a simple system.
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Research and technical report
Research and technical note
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