Charkes Minard was a pioneer of the use of graphics in engineering and statistics. Probably his most famous creation was a flow map showing Napoleon's disastrous Russian campaign of 1812. His map displays:
- the army's location and direction, showing where units split off and rejoined
- the declining size of the army
- the freezing temperatures during the retreat
The timeline below the map shows the date and the temperature as Napolean travelled east towards Moscow. The brown line shows the dwindling size of his army and the black lines show where units split off and rejoined the main army.
This Google Maps mashup shows crime in Oakland. The coloured circles correspond to crimes. The different colours represent different categories of crime.
Both the Minard Map and the Oakland Crime map have the source code and the data source displayed under the maps.