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Data cube option 1 (Everything in one file - a primary header and three image headers)
Number of files: ~7500 data cubes
Data cube option 2 (Spectral cube and three ancillary products - spectral weights, continuum maps, and continuum weights)
Number of files: ~7500 x 4 (spectral cubes, spectral weights, continuum maps. continuum weights) = ~30,000 FITS files
Dimensions of the data
Spectral data cubes and weights: 2 polarizations x 1024 frequency channels x 144 RA pixels x 144 Decl. pixels
Continuum maps and weights: 2 polarizations x 144 RA pixels x 144 Decl. pixelsNumber of files
Volume of data (< 10 TB)
2. Extragalactic Catalog
The catalog description, an ASCII text file, or an a CSV text file. Data volume ~ 5 Megabytes.
3. HI Spectra
Each detection has a single FITS file with a binary table extension, containing the X-Y points of the spectrum and associated metadata. Number: ~30,000 FITS files. Total volume: ~ 1 Gigabyte.
End user manipulation
Th expectation is that a user would search for a position on the sky, or via a galaxy name (NED resolver, etc.). For instance, if one searches on the position 12h20m00s, +09d00m00s, four data cubes, each with three additional ancillary products, would be returned (16 totals hits, total volume would be ~ 1.6 GB).
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Stakeholders
Brian Kent, NRAO, Project Sponsor and Technical Expert
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Martha Haynes, Cornell, Technical Expert
Others?
Requirements
Must haves:
- Ingest of ALFALFA spectral data cubes and for each cube, three ancillary spectral products (spectral weights, continuum maps, continuum weights)
- Ingest of the ALFALFA extragalactic catalog
- Ingest of the ALFALFA spectral line profiles
- Harvest and persistence of relevant generic and collection specific metadata.
- Ability to filter on Collection in observation view (both: "must be in" and "must not be in" semantics) in Archive Interface
- Ability to search on position, data cube name, or object (Cone Search)
Implementation Plan
Risk Assessment
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