A surveying system comprises a laser scanner for scanning a distance measuring light and for acquiring point cloud data and a target instrument having a target for reflecting the distance measuring light, wherein the target is a sphere having a known diameter, the laser scanner comprises a distance measuring module for projecting the distance measuring light, for receiving a reflected distance measuring light and for performing a distance measurement, an optical axis deflector which enables to two-dimensionally deflect the distance measuring light, and an arithmetic control module for controlling the optical axis deflector, and wherein the arithmetic control module is configured to perform a circular scan on a surface of the target by the optical axis deflector, to obtain a center of the target based on the point cloud data acquired by the circular scan and the diameter, and to measure a distance of the center of the target.

A surveying pole is part of a primary surveying system (e.g., a Global Navigation Satellite System (GNSS) or a total station). Cameras are mounted to the surveying pole and used for ground tracking as the survey pole is moved from a place where the primary surveying system is unimpeded to an environment where the primary surveying system is impaired (e.g., to a GNSS-impaired environment or to a position that is blocked from view of the total station). Using ground tracking and/or other sensors, surveying can be continued even though the primary surveying system is impaired.

A prism constant can be obtained more efficiently, using a laser positioning device including an image data obtaining portion obtaining an image data which is obtained by photographing a reflection prism device, a data storing portion storing a relationship of a prism constant of the reflection prism device and the image data, and a prism constant obtaining portion obtaining the prism constant of the reflection prism device based on the relationship.

An apparatus is for use with a rotary laser level system having a rotary laser level that shines a laser light that is received by remote re-positionable laser sensor, for mounting the re-positionable laser sensor in selectable elevation on a manually relocatable rod. The apparatus comprises a track presenting an outer face and rod-engaging face, and having a length extending between a top end and a bottom end, and a sensor carrier operatively mounted on the track for movement along the track. The sensor carrier comprises a housing, a wheel mounted on the housing in rotatable relation about a main axis, wherein the wheel is operatively engaged on the track such that rotation of the wheel causes movement of the wheel along the track, and means for selectively imparting rotation of the wheel about the main axis to thereby cause the sensor carrier to move along the track. In use, when the handle is rotated, the wheel correspondingly rotates, thereby moving the wheel along the track, and correspondingly moving the sensor carrier along the track to a selected position.

An apparatus is for use with a rotary laser level system having a rotary laser level that shines a laser light that is received by remote re-positionable laser sensor, for mounting the re-positionable laser sensor in selectable elevation on a manually relocatable rod. The apparatus comprises a track presenting an outer face and rod-engaging face, and having a length extending between a top end and a bottom end, and a sensor carrier operatively mounted on the track for movement along the track. The sensor carrier comprises a housing, a wheel mounted on the housing in rotatable relation about a main axis, wherein the wheel is operatively engaged on the track such that rotation of the wheel causes movement of the wheel along the track, and means for selectively imparting rotation of the wheel about the main axis to thereby cause the sensor carrier to move along the track. In use, when the handle is rotated, the wheel correspondingly rotates, thereby moving the wheel along the track, and correspondingly moving the sensor carrier along the track to a selected position.

Disclosed is a method for monitoring ground settlement based on computer vision. Before monitoring starts, the first image frame is captured. For one measuring point, the area of the top LED lamp is defined as a tracking template, its pixel center is the reference point for settlement calculation, and a monitoring area is defined by an estimated range. After monitoring starts, the best matched of the lamp template is searched for in the monitoring area of a second image frame. When the best matched area is obtained, its pixel center is obtained as the new lamp position, and it is selected as the new template; the pixel displacement between two adjacent image frames can be obtained by comparison. The total pixel displacement of multiple points during the monitoring period is calculated through the accumulated displacement, and the actual settlement is calculated through a pixel-physical ratio.

Disclosed is a method for monitoring ground settlement based on computer vision. Before monitoring starts, the first image frame is captured. For one measuring point, the area of the top LED lamp is defined as a tracking template, its pixel center is the reference point for settlement calculation, and a monitoring area is defined by an estimated range. After monitoring starts, the best matched of the lamp template is searched for in the monitoring area of a second image frame. When the best matched area is obtained, its pixel center is obtained as the new lamp position, and it is selected as the new template; the pixel displacement between two adjacent image frames can be obtained by comparison. The total pixel displacement of multiple points during the monitoring period is calculated through the accumulated displacement, and the actual settlement is calculated through a pixel-physical ratio.

A method for searching for a target object, which is moved along a path, by a measuring device which has a first reference system, a control device, and an operating controller which has a GNSS receiver having a second reference system and which is connectable to the measuring device via a communication connection.

A method for searching for a target object, which is moved along a path, by a measuring device which has a first reference system, a control device, and an operating controller which has a GNSS receiver having a second reference system and which is connectable to the measuring device via a communication connection.

Detection of a target by a surveying device is automated to achieve simple work. A surveying method uses a surveying device for detecting and identifying a target device having an entire circumference reflection prism and a code display that is arranged in a vertical direction. The surveying device has a laser scanner configured to perform laser scanning along a vertical plane while horizontally rotating. The surveying method includes performing laser scanning by emitting laser scanning light along the vertical plane while making the surveying device horizontally rotate, and detecting the code display on the basis of the laser scanning light that is reflected back.