1. AIDA WP7, Task 2 Third Technology Forum, 16 March 2009, Strasbourg Bruno Rino WP7, Task 2 Server conversion libraries from spectra native format to IVOA SED format

2. AIDA WP7, Task 2 Third Technology Forum, 16 March 2009, Strasbourg Bruno Rino Intent The problem –SSA allows for spectra in “native” FITS format a multitude of different conventions tools need to cope with all these conventions The solution –convert “native” spectra to Spectrum DM, on the server-side First step –use ESO non-raw spectra as samples

3. AIDA WP7, Task 2 Third Technology Forum, 16 March 2009, Strasbourg Bruno Rino Investigation (1) ESO Spectra: Data –Flux “1-d” image on primary HDU –naxis = 1, naxis1 = n 1-row “2-d” image on primary HDU –naxis = 2, naxis1 = n, naxis2 = 1 –Wavelength ( i - crpix1 ) * cdelt1 + crval1 i = 1..n –No error information

4. AIDA WP7, Task 2 Third Technology Forum, 16 March 2009, Strasbourg Bruno Rino Investigation (2) ESO Spectra: Metadata –Required for data transformation: naxis crpix1, cdelt1, crval1 –Essential cunit1 (Wave unit), bunit (Flux unit) multiple syntaxes (A, Angstrom, erg/cm2/s/A, erg/cm^2/A/sec, erg/cm**2/s/angstrom) –Spectrum DM compliance metadata lives in a DB

5. AIDA WP7, Task 2 Third Technology Forum, 16 March 2009, Strasbourg Bruno Rino Status Proof of concept: –Python transformation CGI –Input: URL pointing to a 1d image; –Output: SED recommended FITS (i.e., BINTABLE with 1 row for 1 spectrum); –Header currently copied over as is

6. AIDA WP7, Task 2 Third Technology Forum, 16 March 2009, Strasbourg Bruno Rino To do Check whether erroneous metadata can be recognised and fixed automatically Add SPECTRUM DM suggested keywords (Coverage, sampling, curation, etc.) Massive test against all ESO reduced spectra What other FITS conventions are out there? AIDA_WP7T2@eurovo.org