Advanced charts

Advanced charts are a powerful way to display complex data sets. While less intuitive than basic charts, the visualizations should still tell a story the user can understand.

Alluvial diagram

Alluvial diagrams are a type of flow diagram that represents changes in network structure over time.

Alluvial diagram

Example of an alluvial diagram


A heat map is a graphical representation of data where individual values contained in a matrix are represented as colors.

Horizontal bar chart

Tree diagram

A tree diagram visually represents a hierarchy in a tree-like structure.

Tree diagram, organic view

Tree diagram, node view vs. list view

Geography with overlays

Choropleth map

A choropleth map uses differences in shading, coloring, or the placement of symbols within predefined areas to indicate the average values of a property or quantity in those areas.

Choropleth map

Example of a choropleth map

Proportional symbol

Symbols driven by data are overlayed in geographical regions. A common symbol used is a bubble with the area of the circle proportional to its value in the dataset.

Proportional symbol

Example of a proportional symbol

Connecting lines

Connection maps display points on a map connected by straight or curved lines.

Connection maps are most useful when showing connections and relationships geographically. They can also be used to display map routes through a single chain of links.

Connection maps are particularly powerful when revealing spatial patterns through the distribution of connections or by how concentrated connections are on a map.

Connecting lines on a spatial map

Example of a map with connecting lines