Themes for drawing layers
vary the stylization of drawing objects based on object properties
or data associated with the objects.
For example, you can
vary the shade of blue used for parcels, depending on the assessed
property value of each parcel.
Change the color of
each parcel based on assessed property value.
You can also use predefined
themes, called ramps.
A theme for a drawing
layer can be based on any of the following:
- A property of the objects, such as area
- Data stored in an object data table,
such as pipe diameters
- Data stored in a linked external database,
such as parcel values
The data used for a theme
on a drawing layer can be specific values, such as pipe material,
land use, or pavement type, or a range of values, such as property
value, temperature, or population.
If the data is a set
of specific values, select which values you want. For example, an
agricultural theme might show different crops in different colors. Each
crop is a specific value. You can omit some crops.
If the data is ranges
of values, select how many ranges you want and how to divide the
data. For example, temperature can be any number along a continuum.
You could divide temperature values into three ranges: below 30,
30 - 60, and over 60.
You can add a legend
that lists the conditions of the theme and explains the colors,
symbols, line patterns, shadings, and annotation used.