Device for processing bottom surfaces

The invention relates to an apparatus 2 for processing bottom surfaces 1, in particular for the processing of riding arenas, with at least one liftable of power jacks and lowerable working tool 4 such as a dozer blade, and with at least two stationary be supported on the bottom surface transmitter units 8 for generating laser beams 9 having and the laser beams 9 of the transmitter unit 8 receiving as measured values, supported on the device 2, the receiver unit 6 comprising control unit 14, via which the linkage and the bottom tool are raised and lowered 4 is controlled in dependence on the measured values ​​of the receiver unit. 6 in order to set particular riding arenas 1 or riding paths reproducibly in an automated way height levels, it is provided that the receiver unit 6 on its periphery at least two spaced apart arranged and vertically oriented CCD or LED-bar elements 7 having a plurality of superimposed light detectors 7.1 and having on its periphery with at least two mutually spaced and horizontally oriented CCD or LED-bar elements 10 includes a plurality of juxtaposed light detectors.