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The Application of LinkWinds to EOS


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  • 1. LinkWinds The Linked Windows Interactive Data System The Application of LinkWinds to EOS Principal Investigator: Lee S. Elson- JPL Co-Investigator: Mark Allen - JPL LSE 9/8/97
  • 2. LinkWinds The Linked Windows Interactive Data System • • • • • • • • Program Objectives System Description Services User Interface Design Applications Suite Databases Availability and Use Present and Future Activities: WebWinds LSE 9/8/97
  • 3. LinkWinds The Linked Windows Interactive Data System Program Objectives • Develop a software testbed to support the rapid prototyping and execution of interactive data analysis/visualization applications. • Provide a suite of tools to interactively manage databases and visualize, explore and analyze large multivariate and multidisciplinary data sets. • Develop a user interface which allows maximum data and tools accessibility with a minimum of training. It must be easy to learn and easy to retain. • Provide system design and tools to make the testbed environment accessible to application development by users. LSE 9/8/97
  • 4. LinkWinds The Linked Windows Interactive Data System LinkWinds System Description • A visual data analysis environment built on an object-oriented model. Objects on screen are data, displays and controls. Displays can contain controls. • Objects are made interdependent by interactively linking them. Links are one-way message paths and allow simultaneous manipulation of a variety of applications. Functions like a graphical spreadsheet. • A standard GUI with linking rules results in a direct manipulation interface which is highly interactive, easy to learn and retain, and uniform across all applications. • Network-based groupware (MUSE) requires minimum bandwidth. Useful for cooperative scientific research, remote tutorials and user feedback. Language used also supports rerun script, journal and macro capability. LSE 9/8/97
  • 5. LinkWinds The Linked Windows Interactive Data System LinkWinds Services LinkWinds provides a wide range of services which include: • 2- and 3-dimensional graphical displays of data. • Hard copy of graphical displays, data and text. • Interactive color manipulation and palette creation. • Animation creation and display. • Interactive data subsetting either at the input or output. • A continuously updated journal and a macro capability. • A context-sensitive help system. • Network support for collaborative work. LSE 9/8/97
  • 6. LinkWinds The Linked Windows Interactive Data System LinkWinds User Interface Design • “Direct manipulation’* user interface design. • Continuous representation of displays and controls. • Run by physical actions rather than complex syntax. • Rapid response to operations with immediately visible effects. • All operations are reversible. • Benefits of user interface. • Novices learn functions through demonstration and exploration. • Knowledgeable intermittent users retain operations. • Actions shown immediately, so direction can be changed if necessary. • Actions predictable and easily reversed.. User in control with less anxiety. *Ben Schneiderman, Designing the User Interface, 1992 LSE 9/8/97
  • 7. LinkWinds The Linked Windows Interactive Data System Applications Suite Controls Slider 3-Axis Slider 3-Axis Rotator 2-Axis Rotator Pan-Zoom Slider Combine Slider LightTool Contour Animator Frame Animator ColorTool ColorFilter Display/Controls Combine Compare Data Subset LinePlot Histogram Image Utilities Draw FileFinder SnapShot Displays Plane Polar Globe Isoview Orthoview PointInterp PointSample VolumeView ValueView VectorView Profile 2D Scatter Plot 3D Scatter Plot TrackPixel LSE 9/8/97
  • 8. LinkWinds The Linked Windows Interactive Data System Linking Rules 1. If an empty window appears, fill it by linking a data object to it. 2. Link control objects to other windows you wish to manipulate. LSE 9/8/97
  • 9. LinkWinds The Linked Windows Interactive Data System Data Object Interactivity • Displays metadata. • Supports subsetting operations • pixel decimation • Sub-region selection. • Data value renormalization. • Concatenation of data. • Handles 4-dimensional data. LSE 9/8/97
  • 10. LinkWinds The Linked Windows Interactive Data System Database Formats Accepted LinkWinds accepts the following data file formats: • Raw binary data in 4 and 8 byte floating point and, signed and unsigned 1, 2, and 4 byte integer. ASCII text data. • The NCSA Hierarchical Data Format. (Version 4.1r1 available on request) • The GSFC Common Data Format. • The NCAR Net Common Data Format. • The Planetary Data System headers. • The Astrophysics Flexible Image Transport System. • Two data formats of the Upper Atmosphere Research Satellite. • The Stratospheric Aerosol and Gas Experiment data format. • The SGI native image format (RGB). LSE 9/8/97
  • 11. LinkWinds The Linked Windows Interactive Data System Database Ingestion There are currently three methods for accessing and ingesting data files: • The user integrates database files into LinkWinds by editing up to three text files. These text files define the data file location, data description and associated metadata. Templates of these text files are provided with explanations. If the data have a sufficiently informative header, entry in only one text file is needed. That is the filename with wildcards accepted. • A FileFinder is provided to add data search paths, or search out and retrieve desired data files. These subsequently appear in the LinkWinds menu. If no metadata is provided, default values are provided. • Data files can be retrieved using a World Wide Web browser, and are immediately listed in the LinkWinds menu. LSE 9/8/97
  • 12. LinkWinds The Linked Windows Interactive Data System LinkWinds 2.2 Distribution and Use • After 2 beta releases, version 2.2 was released on January 22, 1997. • This version is available for SGI, SUN, HP, IBM and PC-Based Linux workstations. • It is currently distributed free through our World Wide Web site: “” • It is available to any one who fills out and accepts our license agreement. • Several other Web sites point to our site, including: NCSA, GSFC, Univ. of North Carolina. • More than 1900 copies have been downloaded so far, and they are currently being picked up at the rate of 4 - 5 per day. LSE 9/8/97