8K 7680x4320 4320p.Land levelling is a measure used in surface irrigation, such as basin and furrow irrigation.Tractor and laser farmland leveling control system.Field and land leveller.Land leveling machine.Soil clay land earth territory ground foundation excavation site terrain cinematic smoothing out bad land plane level slope gradient curve working machine plantation infield arable field reconstruction work laser measurement precision floor ground background backdrop groundwork stage land reclamation.