Creating Spatial Feature Classes Based on Proximity, Overlay, and Attributes - Introducing Geographic Information Systems with ArcGIS - page 422

FIGURE 7-15 Select by attributes
window Stalks_Bars; different from
11. Use Selection > Select By Attributes to highlight the two polygons specified as LOCATION
equals LEFT and PLACEMENT equals BOTTOM_OUTSIDE. See Figure 7-15 as a guide. Zoom in
on the selected polygons to check their labels. Zoom back. Look at the attribute table.
12. Use Selection again> Select By Attributes to additionally highlight any polygons specified as
RIGHT and TOP. Hints: Clear the previous expression. For Method, use Add To Current Selection.
Once the selection is done, close the window and examine the result on the map. How many
polygons did this operation add? ____. Dismiss the Select By Attributes window.
13. Turn off Stalks_Bars_spp display and turn on the Stalks_Bars_mpp. Open its attribute table.
Arrange things so that you can see both the table and the map. Display Stalks_Bars_mpp with
a light yellow color. Write down all the attributes of Stalks_Bars_mpp. (Make sure the fields are
wide enough so that you see all the characters of the attribute names.)
_____________, _____________, ______________, _________________,
_____________, _____________, ______________, _________________,
14. Select the two columns entitled LOCATION and PLACEMENT. Right-click and sort them in
ascending order. By selecting records in the table, you should now be able to easily verify
the correctness of the blanks you filled out in Step 10 above, simply by counting the number
of polygons that light up with each selection. When you are done, clear all selections. Then
use the Select Features tool to look at the multipart polygons and their representation in the
attribute table. When you are finished, clear all selections.
When you overlay polygons sometimes new polygons are created where there were none before. Below you
will do a Union that illustrates this fact.