Our system provides smooth and continuous level-of-detail control in all drilling operations. The control parameter is based on a measure of cluster sizes (ref. section 5.1).
Selective Drill-down and Roll-up
We also coupled our drilling operations with brushing. Our system permits
selective drill-down and roll-up of the brushed and non-brushed region
independently. This flexibility is important as it allows the viewing of
a subset of elements in varying levels of detail in relation to elements
outside the subset.