8results about "Boundary marks" patented technology

The application discloses a method for designing and calibrating a detection site of an unmanned aerial vehicle based on high-precision positioning, comprising the following steps: S1, setting a main control point and a standard point; S2, performing static relative measurement and free station measurement, and outputting a reference coordinate data set; S3, introducing a Boolean sand model, calculating accurate three-dimensional coordinate values of the main control point, evaluating residual errors, and generating reference data of the main control point; S4, performing multi-station redundant observation on the standard point, and outputting accurate coordinate data of the standard point; S5, constructing an improved Hamilton Monte Carlo-based Bayesian inference model, introducing a Gaussian mixture prior guide factor, calculating a posterior probability distribution and an extended uncertainty, and generating a calibration data report; and S6, performing independent measurement and comparative analysis, and outputting a final calibration result. The application realizes accurate measurement of point coordinates of a detection site and scientific evaluation of uncertainty, and effectively improves the reliability and robustness of value traceability.

Two-dimensional targets, such as AprilTags, are used as control points. AprilTags can be used as cost effective alternatives to traditional prism targets without losing accuracy. AprilTags can be placed precisely around a construction site as "permanent" survey control points, like positioning reflector targets. A robotic total station, equipped with a camera sensor, can image the two-dimensional targets to efficiently resection itself.

To provide a surveying instrument that reduces a burden of centering work on a worker.SOLUTION: In a surveying instrument (1) capable of irradiating with, spotlight (SL) as visible light for centering toward a position below a vertical axis of the surveying instrument main body (12), the spotlight (SL) is configured that an irradiation shape is an annular shape. When visible light for centering, which passes through a center point (O) of the surveying instrument 1 and is projected on a position right below the surveying instrument (1), is projected in an annular shape having a hole opened at a center like a doughnut, both of an inner circle and an outer circle can be recognized, an outer shape of a measuring object having a target point can be used for target point alignment, there are many marks, and it is easier for a worker to align the annular shape with the target point than a point shape, so that a burden of centering work on the worker is reduced.SELECTED DRAWING: Figure 1

A setting-out method, a measurement system (500), and a computer readable medium. The setting-out method is used for the measurement system (500). The measurement system (500) comprises a navigation module (1, 501), a laser ranging module (2, 502), and a centering rod (6, 503). The navigation module (1, 501) comprises an inertial measuring unit and a GNSS positioning unit. The setting-out method comprises: acquiring projection coordinates of a position vector of an antenna phase center in a first coordinate system by means of a GNSS positioning unit; acquiring distance information between a laser emission point and a laser irradiation point; on the basis of the projection coordinates and the distance information, calculating projection coordinates of the laser emission point in the first coordinate system and projection coordinates of the laser irradiation point in the first coordinate system; further calculating a corresponding setting-out error; and adjusting the centering rod (6, 503) on the basis of the setting-out error.

A lofting method, a multifunctional measurement apparatus and a computer-readable medium. The lofting method is used for a multifunctional measurement apparatus (500). The multifunctional measurement apparatus (500) includes a navigation module (1, 501) and a laser ranging module (2, 502), wherein the navigation module (1, 501) includes an inertial measurement unit. The lofting method includes: calculating plane projection coordinates of a laser irradiation point in a first coordinate system (S101); acquiring plane projection coordinates of a point to be lofted in the first coordinate system (S102); calculating a lofting error in a second coordinate system on the basis of the obtained coordinates (S103); and adjusting the position of the laser irradiation point on the basis of the lofting error until the laser irradiation point coincides with the point to be lofted within a lofting error range (S104). In the lofting method, a laser ranging module (2, 502) is used instead of a centering rod, so that a user can carry a multifunctional measurement apparatus and operate same conveniently, and it is only necessary to move a laser irradiation point in situ to implement long-distance lofting.

An unevenness level inspecting device includes a target T at a known distance from a to-be-inspected surface, a traveling unit for traveling on the to-be-inspected surface, a first marker for marking information on the to-be-inspected surface, and a control unit configured to control the first marker, and the control unit calculates a height of the to-be-inspected surface at a measurement position of the target T based on three-dimensional position coordinates of the target input each time the unevenness level inspecting device travels a predetermined distance, and controls the first marker so as to mark unevenness level information indicating a difference between the height of the to-be-inspected surface and a reference height on a corresponding position on the to-be-inspected surface, and the unevenness level information is marked in a color that differs depending on a magnitude of the difference between the height of the to-be-inspected surface and the reference height.