1. ViRBO features: das2 Jeremy Faden, Cottage Systems

2. 2. hi there 0.5 w/U of Iowa in Don Gurnett’s Plasma Wave Group, ~0.5 bda “Cottage Systems” independently with Reiner Friedel, Mel Goldstein, Jan Merka, Craig Kletzing, Jack Scudder, others, and of course on virbo w/ Bob Weigel. Role in virbo is to provide data visualization tools to virbo.

3. 3. goals Provide graphics and analysis software using virbo data services (“middleware”) Provide trivial method for getting quick looks at data in virbo Promote buy-in by proving high-quality anaylsis software for your data that you’ve provided to virbo

4. 4. path to here--papco Started with papco as virbo graphics provider. –Papco is IDL-based, open source software (Reiner and I maintain). –IDL “Runtime VM” allows IDL applications to run license-free. –Too much installation and configuration –Relies on additional apps for click-and-install functionality.

5. 5. path to here--others Javascript or interactive svg –Would provide installation-less software, runs “on top of” web browser platform –Too complex, unproven technology –lots of new software to build data rendering capabilities

6. 6. path to here--das2 das2 is java-based software for interactive data plotting and analysis –Open-source code developed mostly at U. Iowa Plasma Wave group. (I’m project lead) –Java available for just about every platform, often pre-installed –Java Web Start installs and maintains releases –Most of the work is done: rendering, interactivity model, data model.

7. 7. Introduction to das2 In development since 2002, PW group production use since 2003. Goal was to deliver graphical science products to clients with no installation –Time-series spectrograms and line plots Pure-java plotting software delivered to client along with the data. Highly-interactive applications provided scanning, zooming, and slicing.

8. 8. das2—design goals Installation-less. Click (wait once) and play Highly-interactive –Asynchronous –Graphical configuration (e.g. mouse to zoom) –Slicing, run-my-analysis-here workflow centered –modularily allows new data sources –Output to various formats: pdf, svg, png, ascii.

9. 9. das2 application example http://www-pw.physics.uiowa.edu/das2/apps/vg1pwsSpec.beta.jnlp Video: http://www.cottagesystems.com/virbo/video/das2FirstLook.html

10. 10. das2 design goals Use modular components and science abstractions to encourage reuse and to develop a culture around the functionality –Spectrogram rendering algorithm well-known and understood. –Reiner’s “LvT” algorithm (from papco) for folding Flux(Time) into Flux(L-Shell,Time) Modular components->applications are assembled, not coded.

11. 11. das2 and virbo das2 is a flexible framework for building applications Does it plot X? Answer is generally no, but it can be extended to so do easily. What can it do for virbo as of now?

12. 12. data input ASCII tables ISTP -compliant CDF s (not pure java) netCdf Excel (just for fun…) DODS (OpenDAP) das2Streams New plug-ins implemented in java.

13. 13. output Graphics –Pdf, svg vector formats –Png raster format –Soon eps –Soon copy-n-paste to powerpoint, etc. Digital Data –Dump this data to das2Stream, (an ascii table with xml metadata)

14. 14. das2 cdf demo http://www.cottagesystems.com/virbo/apps/cdfDemo/ Video: http://www.cottagesystems.com/virbo/video/das2inputOutput.html

15. 15. Integration into virbo collect data into data basket Das2 runs on server to provide pdf, eps and png formats for zero-install, zero-download quick- look. (analogous to webmail) Das2 runs on client to allow for interactive use of data. (Self-installing, initial download) Scripting language allows easy definition and control of applications. Virbo used to publish applications to collegues

16. 16. summary My goal is to provide you with excellent tools that will simplify your life, delivering services, not software As your data is delivered into virbo, please give the tools a try, and let me know how they can be improved. Feedback always greatly appreciated

17. 17. Questions and demos