水稲植被状態の地上画像計測における観測角度の特性検討 A Study of the characteristic of the observation angle on the terrestrial image measurement of paddy vegetation cover

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Vegetation coverage is one of the well-known parameters indicating the growth of rice plants. It is usually calculated as a ratio of the extracted visible green area of plants, the green visibility ratio, in a camera image using the vertical photography. However, early in the season, growth is mostly vertical and therefore a near-vertical observation angle doesn't observe vegetation coverage sensitively. But, a near-horizontal angle of observation can observe vertical and horizontal growth and allow early season monitoring of vegetation coverage. In this paper, the green visibility ratios were calculated by the visible green areas in different observation angles (the range of the observation angle 0.0 degrees to 22.0 degrees) using camera image data taken from vertical photography during the growing period. The relationship between the green visibility ratio and the observation angle was analyzed. As a result of this analysis, the green visibility ratio was increased with the increase in the observation angle and the according to the progress of growth. In addition, the range of the observation angle with the green visibility ratio almost equivalent as the vegetation coverage was decreased rapidly with the progress of growth in 40 to 50 days after transplanting.

収録刊行物

  • 写真測量とリモートセンシング

    写真測量とリモートセンシング 50(6), 367-371, 2012-01-10

    一般社団法人 日本写真測量学会

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各種コード

  • NII論文ID(NAID)
    10030287221
  • NII書誌ID(NCID)
    AN00111450
  • 本文言語コード
    JPN
  • 資料種別
    SHO
  • ISSN
    02855844
  • NDL 記事登録ID
    023470354
  • NDL 請求記号
    Z16-147
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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