| 摘要 |
PROBLEM TO BE SOLVED: To provide a measurement device that can implement a true north measurement in which a deviation of a position of the sun is not be included in a measurement result.SOLUTION: A measurement device comprises: a GNSS device 10; a telescope section that is provided in a support stand section; an image acquisition unit that is provided in the telescope section; a horizontal angle measurement unit 16 that detects a horizontal angle of the support stand part; a vertical angle measurement unit 18 that detects a vertical angle of the telescope section; and a control device 20 that has a reference clock signal generation unit 27. The control device 20 is configured to: generate a time signal from a signal of the GNSS device 10; attach a time stamp to the time signal on the basis of the reference clock signal; associate the time signal with the reference clock signal; measure the horizontal angle at a point of time when the telescope section sights the sun, and acquire an image signal; attach the time stamp to the image signal on the basis of the reference clock signal; compute a standard time upon acquiring an image on the basis of the time stamp of the image signal, and the reference clock signal; compute an azimuth angle of the sun on the basis of a latitude and longitude of a point having the measurement device installed, and the standard time upon the acquisition of the image; and update the horizontal angle by the azimuth angle.SELECTED DRAWING: Figure 2 |
