Introducing Geographic Information Systems with ArcGIS: A Workbook Approach to Learning GIS, 3rd Edition

Adding the Rasters with the Raster Calculator

Now you may perform addition on the four rasters whose names begin with rcl. You will use the Raster Calculator.

____ 36. Start the Raster Calculator. By double-clicking the raster names and single-clicking the plus (+) operator, create the expression that adds together the rasters

rcl_soils,

rcl_landu,

rcl_Sewers_buf, and

rcl_Streams_buf

shown in Figure 8-44. Click Evaluate. Call the raster SUM_LuSoStSw and save it in the Wildcat_Boat_SA personal geodatabase. It will appear in the T/C and on the map. What values are produced? ________, ______,______, _____. What value indicates those areas suitable in all respects? ________ Check it out with the Identify tool and the attribute table. In the T/C, change the colors of zones 1, 2, and 3 to light pink. Make zone 4 a dark red. The map should look a lot like the first solution to the Wildcat Boat problem that you developed in Chapter 7, but without the 2000 square meter criterion.

FIGURE 8-44