Spatial Analysis Based on Raster Data Processing - Introducing Geographic Information Systems with ArcGIS - page 498

Buffering—Plan B
ArcGIS provides you the ability to slide easily from one data model to another. Let's take advantage of
the fact that you created vector buffers of both sewers and streams when you solved the Wildcat Boat
problem in the last chapter.
26. Start ArcMap with a Blank Map. Add Streams_buf from
___IGIS-Arc\ YourInitials \Wildcat_Boat_Data\Wildcat_Boat.mdb\Area_Features
to the map. Look at the Attribute Table. You should see 12 records. In each record the value
of the field NoBuild will be 20, indicating the number of meters adjavent to the stream where
building is not allowed. This number will become zone value in the attribute table of the raster
you are about to build.
27. Using the tool Polygon_to_Raster
(where is it? ______________________________________),
start to make a new raster named Streams_buf_rr2m from the Streams_buf feature class. The
location you want to put the raster in is
___IGIS-Arc_ YourInitials \Spatial_Analyst_Data\WC_Boat_SA\Wildcat_Boat_SA.mdb.
Make the cell size 2.0 and the Value field NoBuild. Click OK.
28. The raster will be added to the map. Check out the raster's attribute table. Notice the Value
field. It will indicate “20”. What is count? ________. Zoom way in on the northwest stream.
There is a raster beneath the Streams_buf layer. Make the symbol for Streams_buf Hollow or
No Color to see that the raster conforms (mostly) to Streams_buf. Enhance this image by using
the Symbol Selector of Streams_buf to make the outline of Streams_buf red of width 1. See
Figure 8-42.
29. Using the same procedure as in the two steps above, add Sewers_buf. For the Field value, use
Build. The Cell size should be 2.0. Call the raster Sewers_rr2m.
30. The raster will be added to the map. Check out its attribute table. What is the value and count?
_______, ________. From Wildcat_Boat_SA add to the map the rasters that you previously made:
Landuse_rr2m and Soils_rr2m. Rearrange the T/C, though you won't be able to see everything
you can make things somewhat better.
Reclassifying the Data
When we solved the Wildcat Boat problem with vector-based GIS, we combined landuse, soils, the
sewer buffer, and the stream buffer. After some manipulation we will now do the same with the rasters.
We have