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To: GPS Info who wrote (3244)	3/10/2006 4:17:13 PM
From: ManyMoose	Respond to of 3506

Unfortunately, these are hardened DOS computers, not GPS units. I'm not sure they have any current practical use. They are probably about fifteen years old. Interestingly enough, my employer had one of the finest GIS installations in the world, mainly because it started on the ground floor and could not even function without one with the NEPA requirements for long range planning. Our GIS people did a lot of pioneering work on how to cope with slivers that occur when you try to merge two or more layers in an analysis. For example, suppose you want to draw a map that shows aspect (that is, North South East West orientation of the sloping ground and also want land ownership to show. The ownership line is defined as going up a particular ridge where aspect changes and has never been surveyed. If you merge the ownership layer and the DEM (digital elevation model) layer, there will be thousands of little slivers along such lines that result from differences in who or how the information was digitized. When you have 17 million acres digitized in dozens of different layers, that's one heck of a lot of digitizing. Done by different people or even by the same person on different days, digital GIS data takes many permutations.