Symbolizations

Single Symbolization

Single symbolization displays all objects in the same way. For example, all address points are shown as red dots with a size of 6.

Unique Symbolization

Unique Symbolization assigns the style of individual objects in a layer based on a specific attribute value.

Example:

We have power lines that have a text (dictionary) attribute: overhead or underground.

Using unique symbolization, we can display:

1. all underground lines as solid lines
2. all overhead lines as dashed lines

 

Graduated Symbolization

Graduated symbolization assigns the style of each object in a layer based on the value of a numeric attribute.

Using graduated symbolization, it is possible to define the number of classes and the ranges of attribute values that assign an object to a specific class. A separate style can be applied to each class.

Example:

We have a vector layer with municipalities, and in the attribute “population,” we have the number of people living in each municipality.

We want to display it as follows:

1. Municipalities with a population above 500,000 – in red
2. Municipalities with a population from 50,000 to 500,000 – in yellow
3. Municipalities with a population from 1 to 50,000 – in green

 

Here is an example of graduated symbolization – building permits for apartments by counties.