das2 logo das2 spectrogram

das2 is the second-generation web-based data delivery, visualization, and analysis system built and used by the radio and plasma wave group at The University of Iowa. Data are transmitted to clients along with software to manipulate and display the data.

Review of Old das

The first-generation das delivers data products via gif images. Data product parameters are set with html forms. A slideshow presentation gives an outline of the old system, its shortcomings, and our plans for its replacement.

The Design of das2

das2, now being deployed, consists of several components. Various Java libraries and client-side applications support space science data visualization such as interactive spectrograms, overlays, waveform plots, etc. Distributed data servers and server-side applications here at Iowa (and eventually at other sites) provide self-describing data streams to the client applications. Additional details are available at the wiki.

Programmer Documents

Das 2.2 Interface Reference - 2014-11-17 (PDF)
Includes Das 2.3 proposals as Appendicies

Questions and Answers

We answer questions raised during past meetings and along the way.

Demos

Java Platform Test
Autoplot plots data from many sources. RPWS: Production Nightly
Applications Demo

Advantages

  • Portable system runs on virtually any computer, using freely-available Java Runtime Environment.
  • Nearly installationless design.
  • Client-side data operations: slicing, zooming, export to digital file, publication-quality printing.
  • Java 2D graphics library provides fully-rendered graphics and fonts.
  • Correlate data served from multiple sites.

Related Links

javadoc documentation for the das2 core, a work in progress.
das2 (or just the source code) is available in an svn repository. This is a Netbeans project, or ant may be used to build it.
View the das2 bugs database, which is implemented using Mantis.

"das ist good" -- Ian Dury and the Blockheads

Link to http://www.java.com/ Java and the Java Coffee Cup Logo are trademarks or registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. Created with NetBeans!

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The Radio and Plasma Wave Group, Department of Physics & Astronomy, College of Liberal Arts & Sciences.
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