This is a research project which implements a data level comparative visualization system. It was used to study computational fluid dynamics data and experimental wind tunnel data. It can compare data sets from different sources, different resolutions and/or those computed using different mathematical models of fluid flow.
The paper related to this project was accepted into IEEE Visualization '98 as a case study. For more detail, please refer to: http://www.cse.ucsc.edu/research/slvg/cmp.html
Below are some screen captures of the system in action.