SOLVING GEOSPATIAL TASKS IN 2D AND 3D VISUALIZATIONS OF MAPS - Information Visualisation: Techniques, Usability and Evaluation - page 235

Fig. 12.3. Stimulus picture for experiment 1 with n=15 reference positions.
Distance D1 is the shortest of all possible distances between target positions. D2
indicates the next shortest candidate pair.

(a) (b) (c)

Fig. 12.4. Three different slant angles (conditions) were tested. For clearer
illustration monoscopic renderings with a central perspective are shown here. Tilt
angles are: (a) 45 ͼǢ (b) 55 ͼǢ and (c) 65 ͼ with respect to the vertical plane.