| 摘要 |
PROBLEM TO BE SOLVED: To conduct flow velocity measurements by determining the geometric conversion parameters from the measurement of the angle and the difference in the elevation between at least two points of singular points, rather than using a plurality of control points whose actual coordinates are known. SOLUTION: A device includes a camera means for photographing surface water flow of an actual river; an angle measurement means for measuring the horizontal angle and the vertical angle, between at least two points of singular points as the angle from the projected center coordinates of the lens of the camera means; a range measurement means for measuring the difference in the elevation, at least from the water surface level to the projected center of lens of the camera means; and an analysis means for inputting the captured image data, the horizontal angle and the vertical angle of the singular points, and the difference in the elevation from water surface level.The analysis means carries out geometric corrections on the slant images of the surface water flow of the real river captured by camera means to the vertical plane images, by using the geometrical conversion parameters determined from the angle measurement means and the range measurement means, executes PIV analysis for the vertical plane images acquired, and calculates the flow velocity data for each part of the water surface of the actual river. COPYRIGHT: (C)2008,JPO&INPIT
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