.1 area of 13.40 meters in length and width, 6.10 meters will not have any obstacles. When measured from the surface to 8 metres (Iditarod shouldn't be the turf or sand).
0.1 Field area of 13.40 meters in length and 6.10 meters in width will be no any obstacles. When measured from the ground up to 8 meters (ground should not be a turf field or sand).
The area of the field. 1 length 13.40 meters and the width of 6.10 meters there must not be any obstructions When measured from the ground to go up 8 meters. (the ground should not be a lawn or field sand).