2011

To create themes
■
To create a theme for a feature layer (page 1168)
■
To theme drawing data (page 1176)
Overview of Creating Themes
A theme varies the display of data based on properties or attributes of the data,
for example area, length, pavement type, assessed value, temperature, or land
use.
You can use themes to change colors, line types, symbols, text, or other
properties that can help you present map information and tell a story. Themes
can help make information more visible, illustrate how data is distributed,
make data easier to analyze and interpret, and reveal patterns.
For example, you can use darker colors for areas with more rainfall, a larger
dot to display cities with a larger population, or a wider line to draw roads
with high traffic volume.
A theme showing counties by area
You can theme on specific values or a range of values. For example, an
agricultural theme might show different crops in different colors. Each crop
is a specific value. Temperature, however, can be any number along a
continuum. When you display this type of data, you define ranges for the
values. For example, you could divide temperature values into three ranges:
below 30, 30 - 60, and over 60.
Overview of Creating Themes | 1163