Building surveying device with an automatic plumb point finding functionality

A building surveying device for measuring and marking spatial points during construction and/or development of buildings, comprising:

• a base,
• an upper part supported on the base such that the upper part is rotatable about a rotation axis,
• a sighting unit supported on the upper part such that the sighting unit is pivotable about a pivoting axis and provides distance measuring functionality, with a laser source designed for emitting a laser beam, and a laser light detector, and
• an evaluation and control unit, wherein:
• a first and a second rotary drive enable the upper part and the sighting unit to be driven and aligned;
• a spatial alignment of the sighting unit in relation to the base is acquirable via two goniometers;
• and
• the evaluation and control unit is connected to the laser source, the laser light detector and the two goniometers in order to assign an acquired distance to a corresponding alignment and thus determine coordinates for spatial points,
• wherein the building surveying device has a plumb point finding functionality which, after being triggered, runs automatically, at least in part, and wherein during the plumb point finding functionality, the spatial alignment of the sighting unit is changed under automatic control by the evaluation and control unit with the aid of the first and/or the second rotary drive, the plumb point finding functionality comprising the steps:
• marking and measuring a first spatial point by the laser beam;
• automatically changing the spatial alignment of the sighting unit based on the measured first spatial point in a manner that a second spatial point is targeted by the laser beam in such a way that the second spatial point lies on an object surface opposite of the first spatial point on a vertical plumb line containing the first spatial point;
• marking the second spatial point by the laser beam;
• and
• automatically measuring the second spatial point when the second spatial point is reached with the laser beam;
• wherein a reference with respect to a direction perpendicular to a ground surface as an outer perpendicular direction, parallel to the vertical plumb line, is produced by an inclination sensor, wherein the inclination sensor is configured for determining the inclination relative to the Earth's gravitational field vector about two axes and for communicating the measurement data thereof to the evaluation and control unit.