Map Warping for the Annotation of Metro Maps

Schematic transportation maps usually contain little or no detail describing the environment of stations or their embedding in the surrounding area. The annotation of a distorted city map alleviates this deficiency and further improves the usability of schematic transportation maps by merging two different navigational spaces. Schematic maps are designed to preserve stations´ relative positions, it seems natural to use these positions for aligning a street-level map with a metro map.