wiki:compression
Last modified 8 years ago Last modified on 05/19/2011 08:13:15 PM

Compression

LSST Database

Database

Images

Experiments

1.6.0 (Feb 2011) CFITSIO version 3.280

typeoSgSg:oo:gfSgtSf:oo:fgt:oo:gtfile
raw20908809576120.462.1886976012326400.422.400.591.70/lsst2/imsimdata/imSim/raw/v85748120-fg/E000/R01/S00/imsim_85748120_R01_S00_C10_E000.fits.gz
raw20908809760850.472.1488704012499200.422.360.601.67/lsst2/imsimdata/imSim/raw/v85748120-fg/E000/R10/S10/imsim_85748120_R10_S10_C05_E000.fits.gz
raw20908809715920.462.1588128012470400.422.370.601.68/lsst2/imsimdata/imSim/raw/v85748120-fg/E000/R30/S11/imsim_85748120_R30_S11_C12_E000.fits.gz
raw20908809767720.472.1488416012528000.422.360.601.67/lsst2/imsimdata/imSim/raw/v85748120-fg/E001/R14/S11/imsim_85748120_R14_S11_C15_E001.fits.gz
calibration bias103420807374070.0714.0296192014025600.0910.750.147.37/lsst/DC3/data/obstest/ImSim/bias/v0/R01/S00/imsim_0_R01_S00_C00.fits
calibration bias103420807263160.0714.2496192013910400.0910.750.137.43/lsst/DC3/data/obstest/ImSim/bias/v0/R30/S20/imsim_0_R30_S20_C10.fits
calibration dark1034208010506490.109.8497344016675200.0910.620.166.20/lsst/DC3/data/obstest/ImSim/dark/v1/R02/S10/imsim_1_R02_S10_C05.fits
calibration dark1034208010462480.109.8897344016646400.0910.620.166.21/lsst/DC3/data/obstest/ImSim/dark/v1/R22/S12/imsim_1_R22_S12_C13.fits
calibration flat u1034208044712290.432.31154080067392000.156.710.651.53/lsst/DC3/data/obstest/ImSim/flat/v2-fu/R21/S12/imsim_2_R21_S12_C05.fits
calibration flat g1034208047421980.462.18155232067737600.156.660.651.53/lsst/DC3/data/obstest/ImSim/flat/v2-fg/R10/S02/imsim_2_R10_S02_C06.fits
calibration flat r1034208047723280.462.17155232067392000.156.660.651.53/lsst/DC3/data/obstest/ImSim/flat/v2-fr/R20/S10/imsim_2_R20_S10_C06.fits
calibration flat i1034208048096800.472.15155232068256000.156.660.661.52/lsst/DC3/data/obstest/ImSim/flat/v2-fi/R12/S12/imsim_2_R12_S12_C13.fits
calibration flat z1034208047255570.462.19154656067795200.156.690.661.53/lsst/DC3/data/obstest/ImSim/flat/v2-fz/R42/S21/imsim_2_R42_S21_C16.fits
calibration flat y1034208043407220.422.38153504066700800.156.740.641.55/lsst/DC3/data/obstest/ImSim/flat/v2-fy/R14/S02/imsim_2_R14_S02_C07.fits
calibrated1629705601092196980.671.49207763201108108800.137.840.681.47/lsst2/datarel-runs/pt1prod_im0022/update/calexp/v85661762-fr/R01/S00.fits
calibrated1629763201078788880.661.51210153601097424000.137.760.671.49/lsst2/datarel-runs/pt1prod_im0022/update/calexp/v85661762-fr/R02/S20.fits
calibrated1629705601080796370.661.51209116801098403200.137.790.671.48/lsst2/datarel-runs/pt1prod_im0022/update/calexp/v85661762-fr/R03/S11.fits
calibrated1629734401082334170.661.51209404801098921600.137.780.671.48/lsst2/datarel-runs/pt1prod_im0022/update/calexp/v85661762-fr/R10/S11.fits
calibrated1629734401076448080.661.51210182401094572800.137.750.671.49/lsst2/datarel-runs/pt1prod_im0022/update/calexp/v85661762-fr/R11/S12.fits
calibrated1629849601074182800.661.52210470401092153600.137.740.671.49/lsst2/datarel-runs/pt1prod_im0022/update/calexp/v85661762-fr/R12/S21.fits
calibrated1629849601076021850.661.51209836801094313600.137.770.671.49/lsst2/datarel-runs/pt1prod_im0022/update/calexp/v85661762-fr/R13/S10.fits
calibrated1629849601092067090.671.49208857601107619200.137.800.681.47/lsst2/datarel-runs/pt1prod_im0022/update/calexp/v85661762-fr/R14/S22.fits

where:

  • oS = file size of the original file
  • gS = file size of the file gzipped using: gzip <file>
  • fS = file size of the file compressed using fpack -r <file>
  • gtS = file size of the file compressed using fpack -g -q0 <file> (gzip lossless)
  • g:o = ratio of gZipS : orgS
  • o:g = ratio of orgS : gZipS
  • f:o = ratio of fPackRise : org
  • o:f = ratio of org : fPackRS
  • gt:o= ratio of rPackGzipLossless : org
  • o:gt= ratio of org : rPackGzipLossless

Script used to run these tests: contrib/dbutils/trunk/runImgCompressionTest.py

It has been recognized that the calibration images used for this test are not simulated realistically, largely because the current detector model is too simple.