Figure 4. Example output of the final raster calculation using Equation 2. The buffered tile area (30 meters) raster was combined with the final criteria raster resulting in areas classified into the 8 codes that were symbolized into 4 groups according to the presence of tile and the prediction of tile. The 8 codes are listed in Table 4. In this example the final criteria raster represented all agricultural lands (NLCD), soil drainage classes of very poorly drained, poorly drained, and somewhat poorly drained soils, and slopes of less than 2% (criteria raster lu3dc3s). The study area (right) is shown at a scale of 1:1,750,000. The detail (left) is shown at a scale of 1:24,000.