Geography Reference
In-Depth Information
11. Use the Select tool on polygons in Sites_C to make Final_Sites, such that Final_Sites
contains only those polygons whose Shape_Area is equal to or greater than 4000. Look at the
Geographics. How many polygons are left now? ________. Look at the attribute table. How many
fields (columns, attributes) are left? ________. (Dissolve got rid of a ton of attributes - as will
be explained later.) Final_Sites is the solution to the problem that you have been working on
since Chapter One!
12. Launch ArcMap with a Blank Map. Add as data Final_Sites. Use a bright green color. Also, from
Line_Features, add Sewers as black lines. Zoom to full extent. Use the Measure tool to verify
that all no part of any polygon is more than 300 meters away from the closest sewer line.
13. Add Streams as blue lines. Verify that no part of any polygon is closer than 20 meters to any
stream. Zoom to the extent of the Sewers. Your map should look like Figure 7-24.
14. Compare your final map with the map you made when you worked this problem using manual
means as Exercise 1-1 in the first chapter of the topic. Give yourself a grade, based on 100,
evaluating how well you did at solving this problem by hand. __________. If you didn't do very
well, don't be too unhappy about it. If problems like this were easy to do well by hand, society
wouldn't be spending billions of dollars on computer-based GIS.
15. Make a layout of the results of this exercise, using your own judgment as to what to include and how
to present the various layers. Print your map, preferably in color. Close ArcMap. Close ArcCatalog.
FIGURE 7-24 Final Wildcat Boat sites
Search WWH ::




Custom Search