Evaluation of visual variable size applied to perspective tridimensional maps

The adoption of a not orthogonal point of view in maps creation implies changes in the symbology design to make possible the cartographic communication. There are no general principles for 3D maps and misconceptions in the construction process of these maps may restrict or even impair the proper communication of cartographic features, and their spatial relationships represented. In addition, graphic design technologies allow quite complex and compelling visual solutions, but the problem of proper symbology is compounded by lack of knowledge of how users react to the perspective representation and perceptual differences from conventional topographic map. Therefore, there is a need to adapt the cartographic representations to the 3D environment. This research proposes the evaluation of the visual variable size in some specific features on a 3D map and assesses its influence on the perception of expert users. To accomplish this, the research presents a test methodology that combines qualitative and quantitative techniques to measure the degree of success of the proposition. The results show different degrees of perception of visual variables in the visual differentiation process of landmarks