Orthophotomap-based Micro Landuse Classification and Mophometric Analysis of Farm Paths in Steep Citrus Orchards

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  • 正射投影写真を用いた傾斜地力ンキツ園の微細土地利用分類と園内道の形態分析
  • 正射投影写真を用いた傾斜地カンキツ園の微細土地利用分類と国内道の形態分析
  • セイシャ トウエイ シャシン オ モチイタ ケイシャチ カンキツエン ノ ビサイ トチ リヨウ ブンルイ ト コクナイドウ ノ ケイタイ ブンセキ

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To clarify the distribution, morphology, and geometric allocation of new farm paths constructed in steep citrus orchards, we have developed a method to provide a micro landuse classification map and investigated the path configurations in accordance with landform and cultivating conditions. Micro landuse classification maps were created for four citrus orchards in the Shikoku area, southwest Japan, based on the following procedures: 1) aerial photographs taken from a radio-controlled helicopter; 2) an orthophoto prepared from stereo-pair photos; and 3) distributions of orchard paths and citrus crowns mapped from the orthophotos.<br> Orchard paths were classified into work paths and connection paths. Measurements on these maps show that the areal ratios of orchard-path occupancy reached up to 25% of the entire orchard area. The ratios of citrus-crown occupancy range between 24% and 48%. The orchard-path area tends to increase with the increase in the original mean slope angle α, and the citrus-crown area decreases with the increase in a. In the grown tree areas with work paths, areal ratios of work-path occupancy range between 17% and 25%. These values do not depend on the original slope angle α because work paths were formed close to the contour line. On the other hand, the length of connection paths increases with the increase in original slope angle α. The bending index of connection paths, expressed by the ratio of horizontal path length to horizontal straight length along the slope steepness, also increases with a. Based on the curve of the bending index, the connection-path length is one and one-half times the length of the straight path on a 20-degree slope, and two and one-half times the length of a straight path on a 30-degree slope. Based on the field and numerical investigations, a simple method to estimate orchard-path occupancy is proposed.

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