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Science Data Model

Science Data Model. Michael P. Rupen & Rich Moeser. WIDAR & the SDM. SDM is the set of tables of metadata required to make the binary data astronomically useful SDM is written by MCAF, based on multi-cast data. Data needed for micro-SDM for PTC OTS tests.

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Science Data Model

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  1. Science Data Model Michael P. Rupen & Rich Moeser WIDAR Face-to-Face Meeting December 11-12, 2007

  2. WIDAR & the SDM • SDM is the set of tables of metadata required to make the binary data astronomically useful • SDM is written by MCAF, based on multi-cast data WIDAR Face-to-Face Meeting December 11-12, 2007

  3. Data needed for micro-SDMfor PTC OTS tests • Shape of data cells (number of antennas, BB, SB, pol’n, channels, etc.) • Antenna info (name, XYZ) • Pol’n/feed basics (name, CP) • Channel-to-frequency conversion (spectral windows etc.) • Scan, subscan (times & fields) • On-line & corr. flags (?) • Lots of “stubs” (corr. config.; beam/pol’n response; intents/modes, …) WIDAR Face-to-Face Meeting December 11-12, 2007

  4. Working with the SDM Rich Moeser WIDAR Face-to-Face Meeting December 11-12, 2007

  5. SDM(working with) • We need a way to read and write the SDM • Apps that create and write SDM tables • MCAF • CASA (simulator) • Others? • Apps that need to read SDM • EVLA Archive • CASA • TelCal • Quicklook? • Others? • It would be nice if these applications could share common code to work with the SDM. • Options for working with SDM • ALMA’s SDM classes • Classes generated by JAXB WIDAR Face-to-Face Meeting December 11-12, 2007

  6. ALMA CASA EVLA Archive MCAF UML Authoring Tool (MagicDraw) HLA Code Generation Framework sdm.xmi ACS/CORBA dependencies sdm.xsd (typed) ALMA Generated Source ALMA jar file JAXB (compile and package) JAXB (Java API for XML Binding) JAXB Generated Source JAXB jar file SDM Java Binding Options Master SDM Document WIDAR Face-to-Face Meeting December 11-12, 2007

  7. ALMA’s ApproachBenefits/Concerns • Benefits of using ALMA’s code • Code sharing between ALMA and EVLA • Time saving • Common code can be used by several apps (MCAF, EVLA Archive, CASA, TelCal, etc.) • A number of convenience methods have been added to the generated code. • ALMA will handle compilation and packaging of Java classes. • Concerns • The current version has ACS and CORBA dependencies. (A new version will be released in February that does not have these dependencies.) • What is the process for requesting bug-fixes and new changes? • What would the turn-around time be for such requests? • Not sure if the generated code includes schema validation(?) • The generated code does not use a standard XML parser. WIDAR Face-to-Face Meeting December 11-12, 2007

  8. JAXB ApproachBenefits/Concerns • Benefits of using JAXB code • Java source code is automatically generated • Built-in schema validation • Generated code can be used by multiple apps, MCAF, EVLA Archive, CASA • Uses a standard XML parser • Concerns • No code sharing with ALMA • CASA filler may diverge • Convenience methods will have to be written • JAXB will need to be integrated into the build process and the jar file will need to be created. WIDAR Face-to-Face Meeting December 11-12, 2007

  9. The Plan… • Time allowing…prototypes using both approaches will be developed. • As long as it’s ready, plan on using ALMA’s code for the first cut of MCAF. WIDAR Face-to-Face Meeting December 11-12, 2007

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