has a flat and smooth surface and appropriate slopes, making sure the foundation is qualified for installing artificial grass.Measuring line: Locate the centers of the ground and the two semicircles, and according to these three centers locate the intersecting point of half-way lines and touchlines, and then determine the positions of functional lines and spot by using Pythagorean proposition.Palletising turf roll: According to drawing, position the turf rolls on the exact places along the touch