The invention relates to a self-propelled and self-steering floor cleaning apparatus comprising: a running gear for traveling on the floor surface; at least one cleaning device for cleaning the floor surface; a control device; and a sensor device, the control device being formed and configured to locate or navigate the floor cleaning apparatus in an environment depending on at least one signal from the sensor device, the sensor device comprising, on a front side of the floor cleaning apparatus with respect to its forward direction, a first distance measuring unit which is configured as or comprises a stereo camera system and a second distance measuring unit which is configured as or comprises a scanning unit with structured light, wherein viewing areas of the first distance measuring unit and of the second distance measuring unit are directed in the forward direction of the floor cleaning apparatus and overlap, and wherein the second distance measuring unit is located above the first distance measuring unit on the floor cleaning apparatus with respect to a height direction. The invention also relates to a floor cleaning system.