District boundaries shown on the Zoning Map are intended to follow property lines, center lines of roads, streams and transportation rights-of-way, boundaries of identifiable physical features or measured distances from identifiable points of reference. When the Zoning Officer cannot definitely determine the location of a district boundary by reference to such center lines, by the scale or dimensions set forth on the Zoning Map, or by the fact that it clearly coincides with the property line, he shall refuse to take action; and the Zoning Hearing Board, upon appeal, shall interpret the location of the district boundary with reference to the Zoning Map and the purposes set forth in all relevant provisions of this chapter.