TY - JOUR A1 - Stahnke, Julian A1 - Dörk, Marian A1 - Müller, Boris A1 - Thom, Andreas T1 - Probing Projections BT - Interaction Techniques for Interpreting Arrangements and Errors of Dimensionality Reductions JF - IEEE transactions on visualization and computer graphics N2 - We introduce a set of integrated interaction techniques to interpret and interrogate dimensionality-reduced data. Projection techniques generally aim to make a high-dimensional information space visible in form of a planar layout. However, the meaning of the resulting data projections can be hard to grasp. It is seldom clear why elements are placed far apart or close together and the inevitable approximation errors of any projection technique are not exposed to the viewer. Previous research on dimensionality reduction focuses on the efficient generation of data projections, interactive customisation of the model, and comparison of different projection techniques. There has been only little research on how the visualization resulting from data projection is interacted with. We contribute the concept of probing as an integrated approach to interpreting the meaning and quality of visualizations and propose a set of interactive methods to examine dimensionality-reduced data as well as the projection itself. The methods let viewers see approximation errors, question the positioning of elements, compare them to each other, and visualize the influence of data dimensions on the projection space. We created a web-based system implementing these methods, and report on findings from an evaluation with data analysts using the prototype to examine multidimensional datasets. KW - Informationswissenschaft KW - Visualisierung KW - Interaktive Medien KW - Mehrdimensionalität Y1 - 2016 U6 - https://doi.org/10.1109/TVCG.2015.2467717 SN - 1941-0506 VL - 22 IS - 1 SP - 629 EP - 638 PB - IEEE CY - New York, NY ER - TY - CHAP A1 - Thom, Andreas A1 - Meier, Sebastian A1 - Heidmann, Frank T1 - Anforderungsanalyse bei IT-Experten mit der Experience-Sample-Methode BT - Wie ein Diagramm den Arbeitsverlauf visualisiert T2 - Mensch und Computer 2015 – Usability Professionals N2 - Dieser Beitrag beschäftigt sich mit den Herausforderungen eine Anforderungsanalyse im hoch technologischen Umfeld der IT-Security durchzuführen, bei dem keine der üblichen ethnografischen Methoden wie teilnehmende Beobachtung u.a. möglich waren. Im Umfeld von IT-Sicherheitsexperten besteht grundsätzlich Skepsis bzgl. möglicher Datenerfassungen, die Sicherheitsbelange des eigenen IT-Sicherheits-Betriebes (ITS) betreffen. Diese muss vor allem in der Anforderungsanalyse beachtet werden. Welche Methode könnte hierbei also zum Einsatz kommen? Im Rahmen des Beitrages möchten wir unser Vorgehen und die gewonnen Erkenntnisse im Rahmen eines ZIM-Koop-Projektes des BMWi vorstellen und anhand eines Frameworks inkl. der Sample-Visualisierung der gewonnenen Daten zur Experience-Sample-Methode erläutern. KW - Designwissenschaft KW - Benutzererlebnis KW - Computersicherheit Y1 - 2015 SN - 978-3-1104-4332-5 U6 - https://doi.org/10.1515/9783110443882-015 SP - 133 EP - 143 PB - De Gruyter CY - Berlin ER - TY - CHAP A1 - Meier, Sebastian A1 - Heidmann, Frank A1 - Thom, Andreas T1 - Heattile, a new method for heatmap implementations for mobile web-based cartographic applications T2 - Thematic Cartography for the Society N2 - Mobile handheld computing devices are becoming a more important part of our digital infrastructure. Web-based map services and visualisations for spatial data are being optimised for use on these new mobile devices. Despite the fast development of mobile devices, compared to laptop and desktop computers they remain slower in terms of processing power and have limited memory capacity. Bandwidth in most areas is still limited, regardless of the fast expansion of high-speed internet for mobile devices. To overcome these two limitations an improvement in existing spatial data visualisations is necessary. This chapter compares existing methods and presents a new approach to generating and delivering web-based heat map visualisations for spatial data that is optimised for mobile devices. KW - Mobiles Endgerät KW - Geodateninfrastruktur KW - Computerkartografie Y1 - 2014 SN - 978-3-319-08180-9 U6 - https://doi.org/10.1007/978-3-319-08180-9_4 SP - 33 EP - 44 PB - Springer CY - Cham ER - TY - RPRT A1 - Heidmann, Frank A1 - Thom, Andreas A1 - Meier, Sebastian T1 - Wachstumskern Potenzial : MSNI - Mobile Semantische Navigation und Information, Teilprojekt 3: Nutzerschnittstellen und Content-Visualisierung. Projekt-Schlussbericht ; Berichtslaufzeit: 02/12 bis 01/14 KW - Mobiles Internet KW - Benutzeroberfläche KW - Semantisches Netz KW - Visualisierung KW - Navigation Y1 - 2014 U6 - https://doi.org/10.2314/GBV:834735105 PB - FHP, FB Design CY - Potsdam ER -