A measuring system for determining 3D coordinates, in particular of a plurality of 3D coordinates, of measurement points of an object surface, in particular of an industrial product, in an outer object coordinate system with • an optical scanning device (21,21a,21b,21c) based on the triangulation principle for, especially point by point, optical measurement of the measurement points of the object surface and for determining inner measurement point coordinates in an inner scanning coordinate system, • a referencing arrangement (30,30a,30b,70a,70b) for generating referencing information for referencing the inner measurement point coordinates in the outer object coordinate system and • an evaluation unit for determining the 3D coordinates of the measurement points in the outer object coordinate system depending on the inner measurement point coordinates and the referencing information, so that the inner measurement point coordinates are present as 3D coordinates in the outer object coordinate system, in particular as a scatter plot, characterized by • an unmanned, controllable, automotive air vehicle carrying the scanning device (21,21a,21b,21c), in particular wherein the air vehicle is designed such that the air vehicle can be oriented and moved while hovering, and • a control unit configured such that the air vehicle is moved relative to the object surface under automatic control while maintaining a predefined range of measuring distances, especially a measuring distance • taking into account respective current inner measurement point coordinates determined using the scanning device (21,21a,21b,21c) and/or • taking into account an object surface predefined by a digital model along a flight path (81,82) defined by the digital model. • an optical scanning device (21,21a,21b,21c) based on the triangulation principle for, especially point by point, optical measurement of the measurement points of the object surface and for determining inner measurement point coordinates in an inner scanning coordinate system, • a referencing arrangement (30,30a,30b,70a,70b) for generating referencing information for referencing the inner measurement point coordinates in the outer object coordinate system and • an evaluation unit for determining the 3D coordinates of the measurement points in the outer object coordinate system depending on the inner measurement point coordinates and the referencing information, so that the inner measurement point coordinates are present as 3D coordinates in the outer object coordinate system, in particular as a scatter plot, • an unmanned, controllable, automotive air vehicle carrying the scanning device (21,21a,21b,21c), in particular wherein the air vehicle is designed such that the air vehicle can be oriented and moved while hovering, and • a control unit configured such that the air vehicle is moved relative to the object surface under automatic control while maintaining a predefined range of measuring distances, especially a measuring distance • taking into account respective current inner measurement point coordinates determined using the scanning device (21,21a,21b,21c) and/or • taking into account an object surface predefined by a digital model along a flight path (81,82) defined by the digital model. • a control unit configured such that the air vehicle is moved relative to the object surface under automatic control while maintaining a predefined range of measuring distances, especially a measuring distance • taking into account respective current inner measurement point coordinates determined using the scanning device (21,21a,21b,21c) and/or • taking into account an object surface predefined by a digital model along a flight path (81,82) defined by the digital model. • taking into account respective current inner measurement point coordinates determined using the scanning device (21,21a,21b,21c) and/or • taking into account an object surface predefined by a digital model along a flight path (81,82) defined by the digital model.