Zoomology: ComparingTwo Large Hierarchical Trees

Zoomology compares two classification datasets. In our solution the two trees are merged into a single overview, which unfolds top to bottom and left to right. Color represents rank, and the width of a classification node corresponds to the number of its descendants. Matched twin detail windows allow similarities and differences to be compared as the user navigates their hierarchies via a zoomable interface. THE ZOOMOLOGY APPROACH Our approach is a hybrid of several known techniques built within an overview and detail framework. The overview provides the “big picture” while the detail view explores substructures and nodes within the hierarchies.