MEASUREMENT DEVICE

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 【課題】測定結果に太陽の位置のずれが含まれない真北測量が行える測量装置を提供する。【解決手段】ＧＮＳＳ装置１０と、托架部に設けられた望遠鏡部と、望遠鏡部に設けられた画像取得部と、托架部の水平角を検出する水平測角部１６と、望遠鏡部の鉛直角を検出する鉛直測角部１８と、基準クロック信号発生部２７を有する制御装置２０とを具備し、制御装置２０はＧＮＳＳ装置１０の信号より時刻信号を生成し、時刻信号に基準クロック信号に基づきタイムスタンプを付し、時刻信号と基準クロック信号とを関連付け、望遠鏡部が太陽を視準した時点で水平角を測定すると共に画像信号を取得し、基準クロック信号に基づき画像信号にタイムスタンプを付し、画像信号のタイムスタンプと基準クロック信号に基づき画像取得時の標準時刻を演算し、測量装置が設置された地点の緯度、経度と画像取得時の標準時刻に基づき太陽の方位角を演算し、水平角を方位角で更新する。【選択図】図２