For the purposes of this Ordinance, the measurement of sign area shall comply with the following standards:
(a) Sign area shall include the face of all the display area of the sign not including bracing, framing and structural supports of the sign, unless such support members are made part of the message or face of the design.
(b) Where a sign has two or more display faces, the area of all faces of the sign shall be included in determining the area of the sign. For spherical signs, the sphere shall be bisected by an imaginary line through the center of the sphere, and the surface area of the half sphere shall be counted as the sign face. For cubical signs, the area of all display faces shall be included in determining the area of the sign.
(c) The area of the letters, numbers or emblems mounted on a building wall or wall extension shall be computed by enclosing such sign with the smallest single continuous perimeter consisting of rectangular or series of rectangles around the letters, number or emblems, and determining the area.
(d) For structures and uses having no direct frontage on public roads, as within shopping centers, frontage shall be counted as the intersection of the building line onto adjacent drives or parking areas.