A method for operating a self-propelled agricultural working machine, in particular a harvesting machine, wherein the agricultural working machine has at least one working unit for carrying out or supporting agricultural work in a field, wherein the agricultural working machine has a driver assistance system for generating control actions within the working machine, wherein the driver assistance system has a sensor assembly for generating frontal field information, wherein the driver assistance system generates the control actions on the basis of the frontal field information, wherein the sensor assembly has a laser-based sensor system which generates sensor information in respect of a predetermined, relevant frontal field region of the working machine, wherein the driver assistance system has an image processing system for processing the sensor information, wherein, on the basis of the sensor information from the laser-based sensor system, a displayed image or a displayed image sequence is generated by the image processing system on a display of the driver assistance system in the form of a three-dimensional visualisation of the predetermined, relevant frontal field region of the working machine, characterized in that a field crop edge detection is carried out by the image processing system on the basis of the sensor information from the laser-based sensor system and/or on the basis of the displayed image or the displayed image sequence, and in that the position of a field crop edge detected in the context of the field crop edge detection is graphically accentuated in the displayed image or in the displayed image sequence, in particular with respect to the direction transverse to the direction of travel, and in that the maximum height and/or the mean height of the standing field crop in the predetermined, relevant frontal field region of the working machine is graphically accentuated in the displayed image or in the displayed image sequence, preferably in that the mean height and/or the maximum height of the standing field crop is graphically accentuated by a line (23, 24), in particular a straight line (23, 24), which extends along the height contour of the standing field crop visualised in the displayed image or in the displayed image sequence. wherein the agricultural working machine has at least one working unit for carrying out or supporting agricultural work in a field, wherein the agricultural working machine has a driver assistance system for generating control actions within the working machine, wherein the driver assistance system has a sensor assembly for generating frontal field information, wherein the driver assistance system generates the control actions on the basis of the frontal field information, wherein the sensor assembly has a laser-based sensor system which generates sensor information in respect of a predetermined, relevant frontal field region of the working machine, wherein the driver assistance system has an image processing system for processing the sensor information, wherein, on the basis of the sensor information from the laser-based sensor system, a displayed image or a displayed image sequence is generated by the image processing system on a display of the driver assistance system in the form of a three-dimensional visualisation of the predetermined, relevant frontal field region of the working machine, characterized in that a field crop edge detection is carried out by the image processing system on the basis of the sensor information from the laser-based sensor system and/or on the basis of the displayed image or the displayed image sequence, and in that the position of a field crop edge detected in the context of the field crop edge detection is graphically accentuated in the displayed image or in the displayed image sequence, in particular with respect to the direction transverse to the direction of travel, and in that the maximum height and/or the mean height of the standing field crop in the predetermined, relevant frontal field region of the working machine is graphically accentuated in the displayed image or in the displayed image sequence, preferably in that the mean height and/or the maximum height of the standing field crop is graphically accentuated by a line (23, 24), in particular a straight line (23, 24), which extends along the height contour of the standing field crop visualised in the displayed image or in the displayed image sequence.