Channels

The encoding channels are one of the most important aspects of data visualization. The channel decides how the data is visualized in the chart. Users can get confusing charts or totally unexpected results if they select the wrong channel type. Therefore, a proper understanding of encoding channels is essential for efficient chart building and data visualization.

As shown in previous examples, the encoding channels lie under the Encode tab in the Chart Builder, just under the chart sub-type selection buttons:

Figure 12.39: Encoding channels

Each encoding channel has a name and a type. The channel name defines the target in the graph—that is, the end to which the channel will be used. For example, the X Axis channel name indicates that the channel is providing the values for the horizontal axis of the graph. It is clear in this case that we are going to have a Cartesian bi-dimensional chart. The channel type defines what type of data is expected...