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視差測定桿による孤立木の樹高測定精度について(林学部門)
https://kpu.repo.nii.ac.jp/records/4812
https://kpu.repo.nii.ac.jp/records/4812ae49aa40-c3a2-4e7b-935f-2f8bf020422c
| 名前 / ファイル | ライセンス | アクション |
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KJ00000078811.pdf (484.7 kB)
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| Item type | [ELS]紀要論文 / Departmental Bulletin Paper(1) | |||||||||||||
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| 公開日 | 2017-02-20 | |||||||||||||
| タイトル | ||||||||||||||
| タイトル | 視差測定桿による孤立木の樹高測定精度について(林学部門) | |||||||||||||
| 言語 | ja | |||||||||||||
| その他（別言語等） | ||||||||||||||
| その他のタイトル | On the exactitude in measuring the height of single tree with parallax bar on aerial photographs (Forestry) | |||||||||||||
| 言語 | en | |||||||||||||
| 言語 | ||||||||||||||
| 言語 | jpn | |||||||||||||
| 資源タイプ | ||||||||||||||
| 資源タイプ | departmental bulletin paper | |||||||||||||
| 著者 |
今永, 正明
× 今永, 正明
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| 抄録(日) | ||||||||||||||
| 内容記述タイプ | Other | |||||||||||||
| 内容記述 | 視差測定桿を用いて写真上より樹高測定を行なった場合の測定精度の検討を, 平地孤立木という樹高測定にあたり最適と考えられる条件下で行なった。測定対象は針葉樹, 広葉樹各31本ずつ, 計62本であり, その樹高範囲は10m∿22mである。測定は3名の測定者により, 各対象6回ずつのくりかえし測定が行なわれた。その結果をもとに系統的誤差, 偶然的誤差の分析を共分散分析により実施した。なお検討にあたってはすべて樹高を視差差に換算したものを使用した。得られた結果は次のとおりである。1)系統的誤差は誤差率でおおよそ-5%以内におさまる。2)偶然的誤差は変動係数でおおよそ, 10%以内におさまる。3)測定誤差は測定木の高さに影響される。4)測定者間に系統的誤差, 偶然的誤差ともに有意差がみとめられる。5)広葉樹, 針葉樹間には系統的誤差に有意差がみとめられるが, 偶然的誤差には有意差がみとめられない。 | |||||||||||||
| 言語 | ja | |||||||||||||
| 抄録(英) | ||||||||||||||
| 内容記述タイプ | Other | |||||||||||||
| 内容記述 | This report deals with the exactitude in measuring the height of single tree with parallax bar on aerial photographs. Sixty-two trees, 31 hardwoods and 31 conifers, growing on the level ground were chosen. The range of their heights was from 10 to 22m. The height of these tree was measured with the Blume-Leiss hypsometer on the ground and the values obtained were converted into the parallax differences through the parallax formula, dp=b/H-dh dh (dp : parallax difference, H : flying height of aeroplane, b : photobase length, dh : tree height). Six measurements of parallax difference of each object were obtained by each of three interpreters on aerial photographs which were taken on panchromatic film at a scale of about 1 : 9,000. Six values of measurements were averaged for each object and each interpreter, and the systematic errors were calculated by using the averaged photo values and the ground values. From the results of photo observations, the accidental errors given by the coefficient of variation of measurements were calculated for each object and each interpreter. Both the results are shown in Table 1. And then by means of the method of analysis of variance, the author examined whether systematic and accidental errors respectively differ significantly or not between interpreters and kinds of trees, hardwoods or conifers, (Table 2 and 3). The results are summarized as follows : (1) Systematic errors in percentage are approximately within -5%. (2) Accidental errors in C. V. are appoximately within 10%. (3) Errors of measurements are affected by the height of trees. (4) Among the interpreters, both the systematic and accidental errors are different significantly. (5) Between the hardwoods and conifers, the systematic error differs significantly, but the accidental one not. | |||||||||||||
| 言語 | en | |||||||||||||
| 書誌情報 |
ja : 京都府立大學學術報告. 農學 en : The scientific reports of Kyoto Prefectural University. Agriculture 巻 19, p. 60-64, 発行日 1967-10-15 |
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| 収録物識別子タイプ | NCID | |||||||||||||
| 収録物識別子 | AN00062275 | |||||||||||||
| ISSN | ||||||||||||||
| 収録物識別子タイプ | PISSN | |||||||||||||
| 収録物識別子 | 00757373 | |||||||||||||
