Originally Posted by pauldovi
BTW... Why can't you survery with those images? Land doesn't change that much!
Land may not, but other man-made things do. Perhaps a tree has fallen over, or thick underbrush has cropped up...............or maybe a fire has decemated all fauna.
You could, in theory, survey the dimensions of a plot, sure, but people that buy and sell land have much more interest in what is ON the land, than just how much there is of it.