地上写真測量の船位決定への応用-2-多目標利用の船位決定法および写真機の保持の傾斜に対する補正

概要

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The photogrammetry with a common type camera has been proved to be actually useful for deciding boat-positions1). However, there were also observed, not a few times, considerably great errors of boat-positions, because of unexpected locations of three terrestrial objects chosen for surveying and the boat-position near on a circumference. In order to avoid such impermissible errors, authors attempted to introduce the four or more point method2) into the photogrammetry reported1). The modified method did not give any great errors as before, although the accuracy of survey itself did not differ from that of the three point method obtained under the best condition1). There are also proposed equations (1) and (5) for computing errors of angle and distance due to the inclination of camera in holding when photographs. The procedure for removing these errors was illustrated. The permissible inclination of camera was expressed as a space between the principal horizontal line and the coastal line on the negative film, and it was estimated to be less than 10% of the focal distance of camera-lens provided that the accuracy of survey was required to be within 0.5%. This accuracy may be understood by equation (8) and by referring Table 1.
社団法人日本水産学会の論文