Exercise 5: Create a calculated property

Exercise 4: Save the properties to a new data store

Lesson 3: Using Joined Data to Create Calculated Properties

Lesson 4: Theming Polygon Features

 

AutoCAD Map 3D Tutorials > Styling, Splitting, and Using Joined Data with Polygon Features > Lesson 3: Using Joined Data to Create Calculated Properties > 

Exercise 5: Create a calculated property

Now that you have joined owner data to the Parcels layer and saved the result to a new data store, you can use the combined information to create a calculated property. The calculated property is the result of an expression: in this case, the last sales price divided by the area.

To create a calculated property using joined data

1. At the bottom of the Data Table, click Options, and click Create A Calculation.
2. In the Create A Calculation dialog box, name the calculated property “ValueByArea.”
3. Click Properties. Select Assessor| LAST SALES PRICE.

   

4. Click the operator for “divided by” (the slash character).
5. Click Geometric Area2D.

   This option calculates the area of a polygon.

6. Hold your cursor inside the parentheses, where you see the text “geometry property.” On the tooltip that displays, click Enter A Property.
7. From the Properties list, select Geom.

   Every spatial feature has a geometry property that you can use to calculate area or length.

8. Click Validate to make sure the expression is a valid calculation.
9. When you see “The expression is valid,” click OK to create the calculated property and return to the Data Table.

   Scroll to the right in the Data Table to see the new field. It is gray, to indicate that it is a calculated property and cannot be edited.

10. Close the Data Table.

To continue this tutorial, go to Lesson 4: Theming Polygon Features.