If you are using the low power lens (diameter of field of view = 1.6mm), and it would take 8 of the cells you are looking at to cross the field, what would you estimate the size of one cell to be?

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

high growth (apex)