Abstract: The invention concerns a surveying procedure for a structure (1?), more particularly a high-rise building, to be erected which has an ideal axis (a) oriented relative to the gravity vector. At least three reference points (A5?, B5?, C5?) are defined by receivers (AA, BB, CC) of a satellite-based positioning system (2), on the uppermost construction level (E5) of the structure (1?). The position of ?n electro-optical geodesic instrument (3) assigned to the structure (1?) is determined relative to the three reference points (A5?, B5?, C5?) and to a singular point (P5?) of structure (1?). The tilt (?5) of a real line (a?) developing from the ideal axis (a) under tilt effects acting on the structure (1; 1?) is acquired gravimetrically, more particularly with a gravimetric tilt sensor (I5).

Abstract: The invention relates to ground-based surveying on a site (2) which comprises an unstable zone (60) and at least one control point (FCP1, FCP2, FCP6, FCP7; CP1–CP3) placed outside the unstable zone, in which method at least one surveying device (TS8, TS9; ST1–ST3) is used to acquire positional data by sighting least one control point (FCP1, FCP2, FCP6, FCP7; CP1–CP3). The approach comprises: providing at least one sighting point (UP3–UP5; A–C) within the unstable zone (60; 20), using the surveying device(s) (TS8, TS9; ST1–ST3) to acquire positional data by sighting the at least one sighting point (UP3–UP5; A–C) that is located within the unstable zone (60; 20), and combining the positional data acquired from: i) the at least one control point (FCP1, FCP2, FCP6, FCP7; CP1–CP3) placed outside the unstable zone and ii) at least one sighting point (UP3–UP5; A–C) within the unstable zone (60; 20), to produce a positional reference for the surveying device(s).

Abstract: The invention relates to ground-based surveying on a site (2) which comprises an unstable zone (60) and at least one control point (FCP1, FCP2, FCP6, FCP7; CP1-CP3) placed outside the unstable zone, in which method at least one surveying device (TS8, TS9; ST1-ST3) is used to acquire positional data by sighting least one control point (FCP1, FCP2, FCP6, FCP7; CP1-CP3). The approach comprises: providing at least one sighting point (UP3-UP5; A-C) within the unstable zone (60; 20), using the surveying device(s) (TS8, TS9; ST1-ST3) to acquire positional data by sighting the at least one sighting point (UP3-UP5; A-C) that is located within the unstable zone (60; 20), and combining the positional data acquired from: i) the at least one control point (FCP1, FCP2, FCP6, FCP7; CP1-CP3) placed outside the unstable zone and ii) at least one sighting point (UP3-UP5; A-C) within the unstable zone (60; 20), to produce a positional reference for the surveying device(s).