Thus, a map derived by splicing together the works of many different people with different mapping skills, mapping objectives, and conceptual frameworks, is bound to be inconsistent. Second, the mapping team applied a single mapping strategy to the problem. This strategy included the development of a well-designed criteria for mapping and a plan to carry it out. The Quaternary rocks and sediments of the MDE contain the evidence that is perhaps most relevant to humans and their environment. Furthermore, almost all groundwater moves through and is impacted by these deposits.
Quaternary deposits are also the most easily disturbed by anthropomorphic activities.
Thus, the importance of the Quaternary deposits is clear. The quality of any GIS starts with the quality of the mapping base. The map base is derived from SPOT images that were orthorectified. Although these objective assessments support our empirical contention regarding its quality, we know that the true test of the GIS will come through its use and growth. All line segments of each polygon, regardless of uncertainties, are shown as being the same.