A computerized GIS consists of layers of independent maps that each contain specific information associated with a geographic area.   The simplest application of this is creating basic maps.  On the screen are four maps of the Threemile Pond Watershed and the names of each are listed.  The top is a road map, the next one is the 1998 land use map Kelly talked about before the break, the next is a soil map, and the bottom one a contour map.  GIS was also used to make a bathymetry map, a lake buffer map, and the sample location map all of which will be seen later in the presentation.
	Another application is modeling.  This displays the cumulative effect of several factors in a geographic area and this is what I will focus on.