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FITS Header Keywords for ground test data

FITS Header Keywords for ground test data. Rosa Diaz & Rusty Whitman. Motivation Make the data readily available for future calibration analysis, … Make manageable the large volume of data Uniformity across instruments How we can accomplish this?

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FITS Header Keywords for ground test data

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  1. FITS Header Keywordsfor ground test data Rosa Diaz & Rusty Whitman Rosa Diaz & Rusty Whitman

  2. Motivation • Make the data readily available for future calibration analysis, … • Make manageable the large volume of data • Uniformity across instruments • How we can accomplish this? • All the information relevant to the data comes with the data • The databases have all the information that describes the data Rosa Diaz & Rusty Whitman

  3. FITSWriter software v2.2 (Release 3.0 has been delivered to IGSS) extracts information from the engineering telemetry to populate header keywords. • Primary header keywords subdivided in 4 categories • Standard FITS Header Keywords • JWST Mission Keywords • Observation Description • SCA Configuration Information • Readout Mode • Reference Data Keywords • Image Quality Keywords • Add Control Keywords information about the software used for each test. Rosa Diaz & Rusty Whitman

  4. Extending the set of header keywords • Complete set of header keywords allow easy identification of the data for any JWST science/calibration work or analysis. • Description of the detector setting • Description of the ground test setup • Environment • Optical Ground Support Systems • Description of ground test steps • Add non-engineering information to the data • Uniformity across instrument is efficient • Unique keyword to provide specific information • Keywords understood by different instruments Rosa Diaz & Rusty Whitman

  5. Add Instrument Specific Keywords Rosa Diaz & Rusty Whitman

  6. Optical Ground Support System keywords Rosa Diaz & Rusty Whitman

  7. Course of action • Identify relevant header keywords from available test data (MIRI, NIRcam) • First round of input from instrument teams • Extended set of header keywords • Input from instrument teams • Add new keywords to FITSWriter • Provide information about APID • Provide telemetry mnemonics Rosa Diaz & Rusty Whitman

  8. Adding Engineering Data via the FITSWriter • FITSKeyword.xml contains both the definitions for Engineering FITS keywords and a list of engineering telemetry items to be put in the FITS table. • To add a new entry to the table for a detector, insert a new Item Name in the Table Components section for that detector. <TableComponents detector="NRS1"> <ItemName>INRSD_A1_EXPOSURESTATUS </ItemName> </TableComponents> Rosa Diaz & Rusty Whitman

  9. Adding an Engineering Keyword • Update the Keyword List section of the FITSKeyword.xml • The value selected for a keyword will be taken from the first occurrence of the telemetry item found within the time range of the exposure. <Keyword header="allInstrExt"> <Title>NRS exposure status</Title> <Description>Exposure status from packet 0x23a </Description> <ValueSource>INRSD_A1_EXPOSURESTATUS</ValueSource> <DefaultValue>UNKNOWN</DefaultValue> <FITSComment>NIRSpec ASIC1 Information about current frame: </FITSComment> <FITSName>EXPSTAT</FITSName> <FITShdu>primary</FITShdu> <FITStype>string</FITStype> </Keyword> Rosa Diaz & Rusty Whitman

  10. Rosa Diaz & Rusty Whitman

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