Autodesk 15606-011408-9005 - MAP R6.3 NAMED-10U PK, Tutorials Manual, Page: 309 / 332

7 Hold your cursor inside the parentheses, where you see the text “geometry
property.” On the tooltip that displays, click Enter A Property.
8 From the Properties list, select Geom (at the bottom of the list).
Every spatial feature has a geometry property that you can use to calculate
area or length.
9 Click Validate to make sure that the expression is a valid calculation.
10 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.
11 Close the Data Table.
Where you are now
You joined information from a Microsoft Access database to a layer containing
parcels. You saved the layer out to a new SDF file, making all its data available
in the future. You used the new data source to create a calculated property.
To continue this tutorial, go to Lesson 4: Theme Polygon Features (page 301).
Lesson 4: Theme Polygon Features
You can use the new calculated property you created as the basis for a theme
that styles parcels according to their value by area.
Exercise 1: Create a theme
A theme varies the display of individual features based on data values. For
example, if you theme by parcel value, less expensive parcels can be a lighter
color while more expensive ones are a darker shade.
In this exercise, you create a theme based on the calculated property you
defined for ValueByArea.
NOTE This exercise uses the map you modified in Lesson 3: Use Joined Data to
Create Calculated Properties (page 292).
Lesson 4: Theme Polygon Features | 301