1. A method for facilitating detection of a presence or an absence of at least one underground facility within a dig area, wherein at least a portion of the dig area may be excavated or disturbed during excavation activities, the method comprising: A) electronically receiving, at a first user location remote from the dig area, source data representing at least one input image of a geographic area including the dig area; B) processing the source data so as to display at least a portion of the at least one input image on a display device at the first user location remote from the dig area; C) adding, via a user input device associated with the display device and at the first user location remote from the dig area, at least one indicator to the displayed at least one input image to provide at least one indication of the dig area and thereby generate a marked-up digital image; and D) electronically transmitting and/or electronically storing information relating to the marked-up digital image so as to facilitate the detection of the presence or the absence of the at least one underground facility within the dig area.