Evaluation of Properties to determine the Importance of individual Roads for Map Generalization - Advances in Cartography and GIScience - page 467

Figure 2 : Examples of six schematic networks with different connectivity values
4- Experimental testing of properties
A series of experiments was carried out to evaluate various properties by
implementing two selective omission approaches, stroke-based selection
and mesh density-based elimination.
4.1 Stroke-based selection to testing properties
Strokes were selected according to their importance from the highest one
to the lowest one. Once two or more strokes had the same importance, all
of them were selected in the meanwhile. For each selection, similarity and
connectivity were calculated.
4.1.1 Evaluation of similarity
Figure 3 plot a series of relationships between the number of selected strokes
and the similarity by using five different properties. Only the similarity
compared with the corresponding benchmark at 1:200,000 scale is list
here. The distributions for other scales are very similar.