If you are referring to height variation, yes. We generally apply a 1 to 5 ratio for height variation. 1' of vertical height difference for every 5' of horizontal travel. That is a loose guideline, but it tends to work pretty well in most situations. As to total height of poles, that would depend on what you are trying to cover/clear.

@@tenshon8627 I have a square shade 5 * 5M, I have placed 2 poles at 2.8M and 2 poles at 2.2M, is the difference satisfactory? Because I have a problem with the winds, it makes a belly in the center.

I used a rope to do this. Assuming you already have mounts (such as pad eye) installed, you can tie a rope on one end and bring it to the other end. Warp the end with paper tape and mark it with a pen. Bring the rope in to the house and measure it.

We would typically recommend two people and a 100-300' tape measure.