gis development so far, this major issue has not been effectively addressed. DLG map products precisely this should be a unified theory, technology, and other conditions not achieve reunification of the two products can be unified
GIS development up to now, this problem has not been solved effectively.DLG product is the unity of two kinds of products, but because the theory of technology condition without unified to be united
GIS development to date, this important topic has not been effectively addressed. Digital lined maps product is supposed to be uniform but not achieved because of theoretical and technical conditions uniform products securing uniformity of