Not good at math. Expect someone can work this out in their sleep. Question is if I was going to photograph a 20 acre parcel. Including the whole parcel in one photograph how high would I have to be with my Inspire 1 (original)? Assumptions: Parcel is square and parcel is flat. You are looking straight down at the parcel. Extra credit: how high for a 10 acre parcel? Any help appreciated.