Surveying subsystem comprising a camera module and a control and evaluation unit, wherein the surveying subsystem is adapted to be used as part of a surveying system that is adapted to determine positions of a position measuring resource, wherein the surveying system comprises a hand-carried surveying pole and a display means, the position measuring resource being mounted on the hand-carried surveying pole, • the camera module comprising at least one camera for capturing images, wherein the camera module is designed to be attached to the hand-carried surveying pole, • the control and evaluation unit having stored a program with program code so as to control and execute a spatial representation generation functionality in which □ a series of images of the surrounding is captured with the at least one camera while the surveying system is moved along a path through a surrounding, the series comprising an amount of images captured with different poses of the camera, the poses representing respective positions and orientations of the camera, □ a SLAM-evaluation with a defined algorithm using the series of images is performed, wherein a plurality of respectively corresponding image points are identified in each of several sub-groups of images of the series of images and, based on resection and forward intersection using the plurality of respectively corresponding image points, · a reference point field is built up comprising a plurality of reference points of the surrounding, wherein coordinates of the reference points are derived, and · the poses for the images are determined, characterised in that the spatial representation generation functionality comprises • computing, based on the determined poses, a point cloud comprising 3D-positions of points of the surrounding by forward intersection using the images of the series of images, and • generating a graphical reproduction representing a quality indicative output concerning the measurement uncertainty of a 3D-position for at least one of the computed points of the point cloud, the graphical reproduction being displayable by the display means of the surveying system, wherein the quality indicative output is generated for a subset of points of the point cloud referring to a corresponding amount of poses which the subset is determined from. • the camera module comprising at least one camera for capturing images, wherein the camera module is designed to be attached to the hand-carried surveying pole, • the control and evaluation unit having stored a program with program code so as to control and execute a spatial representation generation functionality in which □ a series of images of the surrounding is captured with the at least one camera while the surveying system is moved along a path through a surrounding, the series comprising an amount of images captured with different poses of the camera, the poses representing respective positions and orientations of the camera, □ a SLAM-evaluation with a defined algorithm using the series of images is performed, wherein a plurality of respectively corresponding image points are identified in each of several sub-groups of images of the series of images and, based on resection and forward intersection using the plurality of respectively corresponding image points, · a reference point field is built up comprising a plurality of reference points of the surrounding, wherein coordinates of the reference points are derived, and · the poses for the images are determined, characterised in that the spatial representation generation functionality comprises □ a series of images of the surrounding is captured with the at least one camera while the surveying system is moved along a path through a surrounding, the series comprising an amount of images captured with different poses of the camera, the poses representing respective positions and orientations of the camera, □ a SLAM-evaluation with a defined algorithm using the series of images is performed, wherein a plurality of respectively corresponding image points are identified in each of several sub-groups of images of the series of images and, based on resection and forward intersection using the plurality of respectively corresponding image points, · a reference point field is built up comprising a plurality of reference points of the surrounding, wherein coordinates of the reference points are derived, and · the poses for the images are determined, · a reference point field is built up comprising a plurality of reference points of the surrounding, wherein coordinates of the reference points are derived, and · the poses for the images are determined, • computing, based on the determined poses, a point cloud comprising 3D-positions of points of the surrounding by forward intersection using the images of the series of images, and • generating a graphical reproduction representing a quality indicative output concerning the measurement uncertainty of a 3D-position for at least one of the computed points of the point cloud, the graphical reproduction being displayable by the display means of the surveying system,