At times, it is useful to contrast maps visuals for different data segments. For example, you can trellis on different calendar years.
The following steps demonstrate how to create a new trellised map on dataset
Air Quality US Cities [data source
yearand drag it over X shelf on the main part of the screen.
yearfield, and select Pick values from list.
In the Pick values for year modal window, select 1990, 1995, and 2000, and then click Save.
Click Refresh Visual.
The new trellised maps appear.
Click Edit next to the title of the visualization.
US Air Quality by Latitude and Longitude, Yearly.
Above the left navigation bar, click Save.