1. A method of identifying a position of a crop row in a field comprising: collecting image data of two or more crop rows; defining a candidate scan line profile for a corresponding heading and pitch of directional movement associated with the two or more crop rows, the candidate scan line profile comprising an array of vector quantities, each vector quantity comprising an intensity value and a corresponding position datum; selecting the position datum associated with a corresponding highest intensity value within the array, as indicative of a candidate position of a crop row; and identifying the candidate position as a preliminary row position if a variation in intensity level of the candidate scan line profile exceeds a threshold variation value.