The Treemap visualization is used to display hierarchical data as a set of nested rectangles. Rectangles of each level are of different sizes and colors.
Each characteristic of the building tiles (rectangles) has a role in the data analysis:
Color - shows the categories by which the treemap visualization is divided. Fields data, used to define this characteristic, can be numerical (123), string (ABC), or date.
Size - shows the value for each category. Fields data, used to determine size, can only be numerical (123).
Label - shows the category and value for each rectangle in the visualization (for flat treemaps (i.e. without hierarchical data)). When you have a treemap with hierarchical data, there is an additional label showing the category and value for the current level.
You can create a visualization without hierarchical data like the one shown below:
You can use treemaps with no hierarchies to show patterns and part-to-whole relations in an attractive and clear way.
The visualization above displays New Sales by Product. To build this visualization you need to do the following:
In the Select Data Source dialog, choose Reveal Sample Data.
In the Visualization Editor choose the Tree Map visualization.
In the Tree Map Data section drop Product in Label, and New Sales in Value.
Note that the data dropped in Label (Product) determines the color and tiles the visualization in five different rectangles.
The biggest tile indicates the largest New Sales value. Rectangles are arranged in size from top left (biggest) to right bottom.
The label at the left bottom of each rectangle shows rounded approximate value for each product. To see exact values, click on a tile to show tooltips (see the screenshot example).
Handling hierarchical data is the treemap’s initial purpose. You can have only one value metric, but unlimited different categories, organized into hierarchy.
In the example above the treemap is split into five big rectangles (branches of the treemap), determined by the Product category. Each of them contains smaller rectangles, determined by the next category level - Territory. Lower levels are not presented.
You may notice two kinds of labels in the example above:
for the big rectangles, top left - show information about total new sales of each product;
for the smaller rectangles, bottom left - show how much of each product is sold in a particular country.
Information about the color and size characteristics of the tiles is similar to what was said about the Treemaps without hierarchies.
You can drill up and down the treemap visualization to navigate between different hierarchy levels. To do this, click on a big rectangle area (irregardless of the tiles it contains). In the tooltip, select Drill Down/Up to.
When you reach the bottom of the hierarchy (the last field dropped in Label), your visualization will look exactly like the flat treemaps.
The totals label over the top of the treemap visualization (on the left) changes at every level. The Totals reflect the changes in the Value field for each hierarchy level in Label (compare totals in the previous examples). In the example above the totals label shows all new sales of product B in Japan.
Use the breadcrumbs in the title to identify the current level, which is displayed. You can also click on them to navigate (instead of drilling up).
In the Settings section of the Treemap visualization you can configure the following:
Show Title - choose whether to show the visualization’s title;
Show Values - choose whether to show labels, displaying information about categories and values for rectangles at different levels;
Start Color - choose a start color from a 10-color palette, Reveal will use your choice to adjust a color scheme;
Links - connect the visualization to a dashboard or URL. For more information, please refer to the Linking Dashboards topic.