Compression

[LSST Database]

Database

• Float compression in database
• MyISAM Compression Evaluation
• FaintSource Table Compression

Images

•  FITS Tile Compression using FPACK, by Rob Seaman
•  fpack homepage
• Astronomical Tiled Image Compression: How & Why, Rob Seaman,  pdf
•  What bandwidth do I need for my image?
•  FPACK FITS Image Compression Program
• Compression at IPAC
• Compression of SDSS at FNAL
•  Data Compression for NGST, Maria Nieto-Santisteban
• Simple experiment:

Raw CFHTLS-D4 MEF image file	707908o.fits	707,330,880 bytes
Naive gzip of original file	707908o.fits.gz	415,726,749 bytes	58.8% of original
fpack 1.2.0 default tiled Rice compression	707908o.fits.fz	334,419,840 bytes	47.3% of original