In some implementations, a system may include a camera, a display, one or more memories, and one or more processors communicatively coupled to the one or more memories. The system may identify a horizontal plane in an image being captured by the camera and presented on the display, may determine a size of the horizontal plane, and may determine that the size of the horizontal plane satisfies a threshold. The system may designate the horizontal plane as a ground plane based on determining that the size of the horizontal plane satisfies the threshold. The system may output an indication that the horizontal plane has been designated as the ground plane.