果樹の立体写真測量

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By combining size of fruit tree with focal length of lens, plane accuracy and depth accuracy of stereo photogrammatry (SP) were calculated at several resolutions of digital image to examine possibility of measuring fruit trees by SP. As the results, throughout a tree crown of any case, the plane accuracy did not exceed several mm, and the depth accuracy did not several decade mm. A focal length of lens was searched by combining these results with possible photographing horizontal distance in each orchard where each size of fruit trees are planted at its highest density. Following methods were effective for SP ; upward photographing using a standard tripod, two sheet pile of net to prevent hail as the back and hand-held type of control point (GCP) set. Orientation succeeded at 100%, when these upward photographs were put in the same coordinate system as aerial photogrammatry. The measurement errors in X and Y coordinates from the simple modeling method were very small. But, calculated values of Z coordinate and the measured values were clearly left from the 1 : 1 line. As a correction method of the Z coordinates, linear regression equations using the calculated values of the GCP data against the measured ones were effective. In most characters of cherry branches, the calculated values from SP and the measured ones were on their 1 : 1 lines. For the five cherry trees with different sizes, the measurement errors decreased by the correction method using wide-angle lenses.　キーワード：立体写真測量，果樹，樹形，枝形，測量精度　Key Words : stereo photogrammetry，fruit trees, tree form, branch form, measurement error
2006-02-15

果樹の立体写真測量

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