Layers of Information

Data layers provide information worth even more than the sum of their parts.

http://www.dees.dri.edu/Projects/emcd_CAG.htm

Micro/macro readings

Although it is good to show both details and their context, this can be difficult to achieve.

Fisheye views focus in on a particular area.

Data density & Small Multiples

Repetitions can provide context for viewing the data.

This example uses spatial relations to show changes in Wall St. over time.

Multidimensional data

Google maps provides different ways of viewing the same information

EPA's Envirofacts and My Environment

Census Bureau's data maps

NASA's Interactive Mars data maps

Guidelines for creating perceptual layers