Figure 1

Exploring the data through the drill functionalities. The drill functionalities can be used in any of the three types of displays (cartographic, chart and tabular). Navigating through different LoDs is simply done by clicking directly on an element or a group of elements. The automatic legends have been removed for better clarity. Section A: (top) Spatial drill-down on a specific member. The result shows only the number of people for the sub-regions included in the selected member. (bottom) Spatial drill-down on a specific LoD. The result shows the number of people for all the members of the next LoD, i.e., all the sub-regions. Section B: Drill-down on a specific member, i.e., a bar of the bar chart. The result shows the number of people for the sub-regions included in the selected member. Section C: Drill-down on a specific member, i.e., a row in the table. The result shows the number of people for the sub-regions included in the selected member.