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Exercise 4: Use the joined data for calculated fields and
styles
Now that you have joined owner data to the parcels layer, you can use the
joined information to create a calculated field and determine your styles.
NOTE This exercise uses the AnalyzeMap1.dwg map you created and modified in
the previous exercises.
To create a calculated field using joined data
1 At the bottom of the Data Table, click Options
2 In the Create A Calculation window, enter a name for the calculated field,
for example "AcresByArea."
3 Click Property to see a list of properties for the current layer. Select ACRES.
4 Click the operator for "divided by" (the slash character).
5 Hover over the
choices. Click Enter a Property. Select AREA.
6 Click Validate to make sure that the expression is a valid calculation.
7 When you see "The expression is valid," click OK to create the calculated
field.
Scroll to the right in the Data Table to see the new field (just to the left
of the joined fields). It is gray, to indicate that it is a calculated field and
cannot be edited. However, you can use it for styling.
You can display information differently at different zoom levels in AutoCAD
Map 3D. Create a style that displays owner names on the parcel layer at a high
zoom level, but not at a lower one. (The parcel owner names come from the
joined data source.)
To create a style using the joined data
1 In Display Manager, select the Parcels layer and click Style.
2 Click the
3 For Property To Display, select Assessor|OWNERLASTNAME.
4 Click OK.
Exercise 4: Use the joined data for calculated fields and styles | 219
marker that is inserted to see a tooltip with
[value]
button in the field under Feature Label.
Create A Calculation.
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