Browsing by Author "North, C."
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Item Snap-Together Visualization: A User Interface for Coordinating Visualizations via Relational Schemata(2000-04-26) North, C.; Shneiderman, B.Multiple coordinated visualizations enable users to rapidly explore complex information. However, users often need unforeseen combinations of coordinated visualizations that are appropriate for their data. Snap-Together Visualization enables data users to rapidly and dynamically mix and match visualizations and coordinations to construct custom exploration interfaces without programming. Snap's conceptual model is based on the relational database model. Users load relations into visualizations then coordinate them based on the relational joins between them. Users can create different types of coordinations such as: brushing, drill down, overview and detail view, and synchronized scrolling. Visualization developers can make their independent visualizations snap-able with a simple API. Evaluation of Snap revealed benefits, cognitive issues, and usability concerns. Data savvy users were very capable and thrilled to rapidly construct powerful coordinated visualizations. A snapped overview and detail-view coordination improved user performance by 30-80%, depending on task. (Also cross-referenced as UMIACS-TR-2000-22)Item User Controlled Overviews of an Image Library: A Case Study of the Visible Human(1995) North, C.; Shneiderman, B.; Plaisant, C.; ISRThis paper proposes a user interface for remote access of the National Library of Medicine's Visible Human digital image library. Users can visualize the library, browse contents, locate data of interest, and retrieve desired images. The interface presents a pair of tightly coupled views into the library data. The overview image provides a global view of the overall search space, and the preview image provides details about high resolution images available for retrieval. To explore, the user sweeps the views through the search space and receives smooth, rapid, visual feedback of contents. Desired images are automatically downloaded over the Internet from the library. Library contents are indexed by meta-data consisting of automatically generated miniature visuals. The interface software is completely functional and freely available for public use at: http://www.nlm.nih.gov/.