Geography Reference
In-Depth Information
22. To clear all selections, click somewhere off the map with the Select Features tool. Close the
attribute table.
Selecting by Location
In what follows you will examine some of the interesting and useful ways ArcMap has of selecting features
by their locations.
23. From
___IGIS-Arc_ YourInitials \Wildcat_Boat_Data
\Wildcat_Boat.mdb\Area_Features
add the feature class Soils to the map. Make the symbol color of soils Light Apple green. Make
sure the Soils entry appears above the Landcover entry in the T/C.
From
___IGIS-Arc_ YourInitials \Wildcat_Boat_Data
\Wildcat_Boat.mdb\Line_Features
add the feature class Roads. Using the Symbol Selector window, represent the roads as
Highway under Symbology, reached by double clicking the entry name. The Highway symbol will
show up as red, but change the width to 2. Make sure it appears at the top of the T/C.
24. Choose Selection > Select By Location. Read the text at the top of the box. Under Selection method
you have four choices. List the contents of the drop-down text box to fix the possibilities in your
mind. ___________________, ___________________, ___________________, ___________________
For the Selection method, choose “select features from”. In the text box “Target layer(s)” put
a check by Roads. In the Source layer text box choose Soils. For the Spatial selection method,
choose from the drop-down menu “Target layer(s) features are completely within the source
layer feature”. If you were expressing this in English you would say: “I want to select all features
from the layer Roads that are completely within the boundaries of any polygon of the features of
Soils.” If a feature of Roads crosses a polygon boundary it will not be selected.
25. Click Apply, then Close. From the map, you can see that the roads that are completely
contained within any single polygon are highlighted in cyan. Those segments that cross polygon
boundaries are not highlighted.
26. Open the Roads attribute table and note, using Identify on a few of the selected Road
features, that the corresponding records (based on OBJECTID) are selected. Close the
attribute table.
27. If necessary, drag the layer Landcover to the bottom of the T/C. Clear all selected features.
Turn off Roads, but leave both Landcover and Soils on. What layer appears on the map?
________________
 
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