A calendar heatmap visual has the following shelves:
Use a Dimension field from the Data menu to trellis the visual into columns.
This shelf accepts multiple fields.
Use a Dimension field from the Data menu to trellis the visual into rows.
This shelf accepts multiple fields.
Add a date field from the Data menu to determine the range of the calendar.
This shelf accepts a single field.
Add a Measure field from the Data menu to specify the values aggregated across the dates of the calendar.
This shelf displays only one field on the graph. Additional fields appear only in the Tooltip.
Add Measure fields from the Data menu for additional information in the graph's tooltip.
This shelf accepts multiple fields.
Add Dimension or Measure fields from the Data menu to include or exclude categorical or value criteria.
This shelf accepts multiple fields.