Heat Maps

A heat map positions color-coded circular elements at specified locations on an image, for example, to visualize temperature by room, as shown in the following figure.

In a heat map, the data value used for color coding is called the "intensity" value. The basic steps to create a heat map are as follows:

Define a group and add an image and heat map component to the group. Configure the image and heat map to be the same size.
In the heat map's dataflow, create a table containing the data required to populate the heat map. The minimum required data are location (X and Y specified in pixels) and intensity.
Bind the dataflow table to the heat map's Table property, and configure the heat map's X Field, Y Field and Intensity Field properties.
Set the heat map's Data Min and Data Max field to the minimum and maximum intensity values you need to render and configure the Fill property to the color gradient that you want to use to convey the relative values displayed.

To configure the size of the elements, set the Radius property. To configure how the gradient is apportioned, set the Falloff property.

If you are using a heat map with a real-time data feed, define two tables in your dataflow: a static table that specifies the locations where you want to render elements, and a table that receives the intensity values. Join them into a single result table that you can bind to the heat map. The following figure shows a simple example of this approach, using room name as the identifying column for the join.

Return to Atrius Developer Portal Home Page