空中写真判読による天然林の類型化とその応用に関する研究
1976 年 40 巻 2 号 p. 2-12
詳細
1976 年 40 巻 2 号 p. 2-12
The present communication serves as an introduction to the categories of natural forest stands by means of interpretation of aerial photos carried out for well over the past dozen years by the author, and at the same time, describes its application to land surveys, as summarized in the following.
1) A Study of the nature of aerial photos evidences, the following merits: recordability, objectivity, . reproductivity and expressibility. Taking into consideration these characteristics, we discussed the qualitative and quantitative representation of objects by aerial photos corresponding to the photographing altitude. Furthermore we defined the interpretation of aerial photos as “the coordinated understanding of qualitative and quantitative data of a photographed object by means of aerial photos accomplished for a certain purpose of the object”.
2) In the study of forests by means of aerial photos, we stressed the fact that the categories of forest stands are the essentials preceding any survey. The author's method of classification of forest stands is based on the premises of completion by means of land survey; thus accuracy could be expected.
3) In the Japanese history of utilization of aerial photos, importance was attached more to the quantity than to the quality. This is particularly true in case of forest studies during the period of high economic growth after 1955.
4) The present communication describes in detail the various interpretations of aerial photos: tree crown stratum, group of tree species, class of density, class of tree height, etc. Furthermore we described the changes in the forest aspect and the estimation of wood volume of a forest stand as an example of the study, which made us understand that this is the practical category of forest stands.
5) We described the vegetation study, the survey of afforested zones in cities and plans for landscaping as an application to land survey. We could understand that the method of interpretation of aerial photos mainpoint of which is the mutual confirmation of “land aerial photo” by means of eyes and legs of human beings enables us to sufficiently cope with all kinds of land survey.
