TY  - GEN
A1  - Delikostidis, Ioannis
A1  - Engel, Juri
A1  - Retsios, Bas
A1  - Elzakker, Corné P.J.M. van
A1  - Kraak, Menno-Jan
A1  - Döllner, Jürgen Roland Friedrich
T1  - Increasing the usability of pedestrian navigation interfaces by means of landmark visibility analysis
T2  - Postprints der Universität Potsdam : Mathematisch Naturwissenschaftliche Reihe
N2  - Communicating location-specific information to pedestrians is a challenging task which can be aided by user-friendly digital technologies. In this paper, landmark visibility analysis, as a means for developing more usable pedestrian navigation systems, is discussed. Using an algorithmic framework for image-based 3D analysis, this method integrates a 3D city model with identified landmarks and produces raster visibility layers for each one. This output enables an Android phone prototype application to indicate the visibility of landmarks from the user's actual position. Tested in the field, the method achieves sufficient accuracy for the context of use and improves navigation efficiency and effectiveness.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 599 
KW  - pedestrian navigation
KW  - landmark visibility
KW  - user-centred design
KW  - usability testing
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-415500
SN  - 1866-8372
IS  - 599
SP  - 523
EP  - 537
ER  - 
TY  - GEN
A1  - Scheibel, Willy
A1  - Trapp, Matthias
A1  - Limberger, Daniel
A1  - Döllner, Jürgen Roland Friedrich
T1  - A taxonomy of treemap visualization techniques
T2  - Postprints der Universität Potsdam : Reihe der Digital Engineering Fakultät
N2  - A treemap is a visualization that has been specifically designed to facilitate the exploration of tree-structured data and, more general, hierarchically structured data. The family of visualization techniques that use a visual metaphor for parent-child relationships based “on the property of containment” (Johnson, 1993) is commonly referred to as treemaps. However, as the number of variations of treemaps grows, it becomes increasingly important to distinguish clearly between techniques and their specific characteristics. This paper proposes to discern between Space-filling Treemap TS, Containment Treemap TC, Implicit Edge Representation Tree TIE, and Mapped Tree TMT for classification of hierarchy visualization techniques and highlights their respective properties. This taxonomy is created as a hyponymy, i.e., its classes have an is-a relationship to one another: TS TC TIE TMT. With this proposal, we intend to stimulate a discussion on a more unambiguous classification of treemaps and, furthermore, broaden what is understood by the concept of treemap itself.
T3  - Zweitveröffentlichungen der Universität Potsdam : Reihe der Digital Engineering Fakultät - 8 
KW  - treemaps
KW  - taxonomy
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-524693
IS  - 8
ER  -