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.
exercise uses the AnalyzeMap1.dwg map
you created and modified in the previous exercises.
To create a calculated field using joined
- At the bottom of the Data
Table, click Options Create
- In the Create A Calculation window,
enter a name for the calculated field, for example “AcresByArea.”
- Click Property to
see a list of properties for the current layer. Select ACRES.
- Click the operator for “divided by” (the
- Hover over the [value] marker
that is inserted to see a tooltip with choices. Click Enter
a Property. Select AREA.
- Click Validate to
make sure that the expression is a valid calculation.
- 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
To create a style using the joined data
- In Display Manager,
select the Parcels layer and click Style.
- Click the button in the field under Feature
- For Property To Display,
- Click OK.
- Click Add a Scale Range so
that you have two scale ranges, both the same.
- Set the bounds of the first scale range
to 0 to 10000 and the second to 10000 to Infinity.
- Select the second scale range (10000
- Click in the Feature
- Clear the check box for Create
A Label (at the top of the dialog box) and then click OK.
- Close the Style Editor.
- Save your map file.
The new Parcels style
displays the names of the owners when the view is zoomed to 10000
or closer. The labels are not displayed when you zoom out beyond
Where you are now
You joined information
from a Microsoft Access database to a layer containing parcels.
Using the combined data, you created a calculated field. You created
a style that displays parcel owner information at high zoom levels,
but does not display these labels at lower zoom levels.
To continue this tutorial,
go to Lesson 3: Analyze Data by Proximity Using Buffers