# A clause for an undetermined area which can covers a line

I wrote:

We don't suppose a fixed area to cover the top edge of a pallet car, because minor changes in the angle or the focal length of the monitoring camera, or minor differences in the positions of the pallet cars can cause disadjustment.

However I am told to write the paper from the perspective a third person. Then I changed it to:

The area to cover the top edge of a pallet car is not supposed to be fixed, because minor changes in the angle or the focal length of the camera, or small differences in the positions of different pallet cars can cause readjustment

My first question is if they are equivalent. Also, for the first sentence I don't know which of the following is better:

• The area to cover the top edge of a pallet car is not supposed to be fixed.
• The area that can cover the top edge of a pallet car is not supposed to be fixed.

• The area that covers the top edge of a pallet car is not supposed to be fixed.

• The area for covering the top edge of a pallet car is not supposed to be fixed.

Do they all have the same meaning? which is more natural? In fact we look for an area in the image, which covers the top edge of an object. it is not determined in the first place.

In the image of bellow suppose the filled box is the pallet car and the blue rectangle is the area to cover its top edge. In A this situation holds but it may not hold in B, if we suppose a fixed coordinates for the rectangle.

• I think your second sentence serves your intention better by expressing the possibility of using that area. BTW I didn't understand the meaning of area here. Is it a part that is attached to the car? – Yuri Oct 10 '16 at 20:58
• @Yuri I modified the question. It is in an image. – Ahmad Oct 10 '16 at 21:02
• I should say no, they don't have the same meaning. I think it will be helpful to attach a picture for those who want to answer the question. Still I can't get the meaning of area here. Besides, this area is going to be fixed at the end or not. These all, I think, can be a contributing factor to which sentence to be used. – Yuri Oct 10 '16 at 21:18
• @JohnFeltz maybe the region is better word. – Ahmad Oct 11 '16 at 11:21
• You say would require but I expected simply require. The coordinates of the region cannot be fixed because {certain conditions} require the region's position to be adjustable. – Tᴚoɯɐuo Oct 11 '16 at 14:34