| 1. |
- Johansson Fernstad, Sara, et al.
(författare)
-
A Task Based Performance Evaluation of Visualization Approaches for Categorical Data Analysis.
- 2011
-
Ingår i: Proceedings - 15th International Conferenceon Information Visualisation. - Los Alamitos, CA, USA : IEEE Computer Society. - 9781457708688 ; , s. 80-89
-
Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Categorical data is common within many areas and efficient methods for analysis are needed. It is, however, often difficult to analyse categorical data since no general measure of similarity exists. One approach is to represent the categories with numerical values (quantification) prior to visualization using methods for numerical data. Another is to use visual representations specifically designed for categorical data. Although commonly used, very little guidance is available as to which method may be most useful for different analysis tasks. This paper presents an evaluation comparing the performance of employing quantification prior to visualization and visualization using a method designed for categorical data. It also provides a guidance as to which visualization approach is most useful in the context of two basic data analysis tasks: one related to similarity structures and one related to category frequency. The results strongly indicate that the quantification approach is most efficient for the similarity related task, whereas the visual representation designed for categorical data is most efficient for the task related to category frequency.
|
|
| 2. |
- Lundblad, Patrik, 1982-, et al.
(författare)
-
Exploratory Visualization for Weather Data Verification
- 2011
-
Ingår i: Proceedings of the 15th Information Visualisation (IV), 2011. - : IEEE. - 9781457708688 ; , s. 306-313
-
Konferensbidrag (refereegranskat)abstract
- Today weather forecasts assist in the preparation of roads during the winter season to avoid accidents resulting from snow, rain and slipperiness. As with any weather forecast there is always a search for improvement. One way to do this is by verifying the forecasted parameters with the actual weather observed in the forecasted area. To facilitate identification of significant trends and patterns within weather data we have developed an application based on interactive information visualization techniques. The application was created in close collaboration with domain experts from the Swedish Meteorological and Hydrological Institute and initial feedback from a performed user study shows that interactive visualization speeds up the analysis process as well as increases flexibility compared to currently used manual methods.
|
|
| 3. |
- Mikkelsen, Christine, 1981-, et al.
(författare)
-
Interactive Information Visualization for Sensemaking in Power Grid Supervisory Systems
- 2011
-
Ingår i: Proceedings - 15th International Conferenceon Information Visualisation. - Los Alamitos, CA, USA : IEEE Computer Society. - 9781457708688 ; , s. 119-126
-
Konferensbidrag (refereegranskat)abstract
- Operators of power grid supervisory control systems have to gather information from a wide variety of views to build situation awareness. Findings from a conducted field study show that this task is challenging and cognitively demanding. Visualization research for power grid supervisory control systems has focused on developing new visualization techniques for representing one aspect of the power system data. Little work has been done to demonstrate how information visualization techniques can support the operator in the sense making process to achieve situation awareness. To fill this gap, and with support from a field study, we propose solutions based on multiple and coordinated views, visual interactive filtering and parallel coordinates.
|
|
