Method for acquiring state data (ZD) of an electrical overhead line system installed along a stretch of road (SS), with which overhead line system a current collector of an electrically or hybrid-electrically driven road vehicle travelling along the stretch of road (SS) can be brought into contact for power transmission purposes, - wherein, by means of a sensor facility of a measurement vehicle traversing the stretch of road (SS), three-dimensional location data (LD) of environment points (UP) representing a vehicle environment (UMP) is acquired (step 102) in each case at measurement points (MP), - wherein, by means of a satellite-based position determination facility of the measurement vehicle , spatial coordinates (OK) of the measurement positions (MP) are determined (step 101), - wherein, by assigning the spatial coordinates (OK) of a measurement position (MP) to the location data (LD) acquired at this measurement position (MP), an environment point cloud (UPW) with geocoordinates (GK) of the acquired environment points (UP) is generated (step 108), - wherein, by means of an object recognition facility , - one or several fixed reference objects (RO1, RO2, RO3) with known reference coordinates (RK) present in the vehicle environment (UMP) and - one or several system objects of the overhead line system present in the vehicle environment (UMP) are recognised (steps 109, 110) from the geocoordinates (GK) of the environment point cloud (UPW) generated, - wherein a deviation (ΔGR) of the geocoordinates (GK) of the environment points (UP) assigned to a recognised reference object (RO1, RO2, RO3) from the reference coordinates (RK) thereof is ascertained (step 112) and the geocoordinates (GK) of all environment points (UP) of the environment point cloud (UPW) are corrected (step 113) by the deviation (ΔGR) ascertained, and - wherein, by means of the object recognition facility , state data (ZD) of the system objects is ascertained (step 115) from the corrected geocoordinates (GK') of the system objects . - wherein, by means of a sensor facility of a measurement vehicle traversing the stretch of road (SS), three-dimensional location data (LD) of environment points (UP) representing a vehicle environment (UMP) is acquired (step 102) in each case at measurement points (MP), - wherein, by means of a satellite-based position determination facility of the measurement vehicle , spatial coordinates (OK) of the measurement positions (MP) are determined (step 101), - wherein, by assigning the spatial coordinates (OK) of a measurement position (MP) to the location data (LD) acquired at this measurement position (MP), an environment point cloud (UPW) with geocoordinates (GK) of the acquired environment points (UP) is generated (step 108), - wherein, by means of an object recognition facility , - one or several fixed reference objects (RO1, RO2, RO3) with known reference coordinates (RK) present in the vehicle environment (UMP) and - one or several system objects of the overhead line system present in the vehicle environment (UMP) - one or several fixed reference objects (RO1, RO2, RO3) with known reference coordinates (RK) present in the vehicle environment (UMP) and - one or several system objects of the overhead line system present in the vehicle environment (UMP) - wherein a deviation (ΔGR) of the geocoordinates (GK) of the environment points (UP) assigned to a recognised reference object (RO1, RO2, RO3) from the reference coordinates (RK) thereof is ascertained (step 112) and the geocoordinates (GK) of all environment points (UP) of the environment point cloud (UPW) are corrected (step 113) by the deviation (ΔGR) ascertained, and - wherein, by means of the object recognition facility , state data (ZD) of the system objects is ascertained (step 115) from the corrected geocoordinates (GK') of the system objects . <EOS>