1. A method comprising: producing a frequency domain representation of a digital image comprising plants and identifying at least one desired patch in said frequency domain representation, according to predefined frequency characteristics of said desired patch; removing all frequencies outside said desired patch to obtain a masked frequency domain; and reverse transforming, by a computing device, said masked frequency domain to obtain a reverse transformed image comprising spatial elements representing plant rows corresponding to said desired patch; wherein said predefined frequency characteristics comprise: at least one dominant frequency value; at least one predefined frequency characteristic corresponding to at least one predefined spatial characteristic relating to at least one attribute of said plants; or any combination thereof, and wherein the attribute of said plant is planted row spacing, spacing between plants on the same row, direction of plant rows, typical row samples manually marked on the aerial image providing any of the above attributes, or any combination thereof.