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or population. When you display this type of data, you define ranges
for the values.
3 Next to the Theme Type list, click Values to specify the data to use for
the theme.
4 In the Thematic Values dialog box (page 1644), under Data Values, specify
the data to use. For Obtain From, click
to choose from a list of data
sources.
5 To ignore or exclude certain values in the data, specify them in the Ignore
box.
These values, while present in the data, may be inappropriate for use in
the theme. Examples include null or empty data values.
6 To normalize the data relative to some other data value, for Normalize
By, enter a value or an expression. Click
to choose from a list of data
sources.
7 Click Read Data.
AutoCAD Map 3D reads the values in the selected data source.
If there is no data, verify that there are objects in the layer. The Display
Manager does not work with civil objects or objects from attached
drawings that have been queried into the current drawing using a standard
Query. To use objects from attached drawings with the Display Manager,
create a Query layer.
8 If you are not working with ranges, select the values to include in your
map.
9 If you are creating a theme with ranges, under
Data Ranges (page 1629),
choose how to divide the values into ranges.
10 Click OK to close the dialog box.
11 Under
Thematic Details (page 1643), specify how to style objects in the
theme, and the text labels to use in the legend.
12 Click Done.
To edit a theme for drawing data
■ In Display Manager, right-click the drawing theme to edit and choose Edit
Theme.
1182 | Chapter 8 Analyzing Data