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# IPP Data & DVO Distribution

This is the PS1 internal data distribution server.  

Data is distributed in several formats.  Here is an explanation of the
differences:

* DVO Databases : these files contain the DVO-database format
  information.  Each directory below is a snapshot of one of the
  working DVO databases used by the IPP system.  The 3pi database
  snapshots include measurements from the single exposures ("camera
  smfs"), consisting primarily of the psf modeling of sources, along
  with some minor extended source information (moments, kron radii &
  magnitudes).  These databases have been calibrated astrometrically
  and photometrically.  2MASS photometry is included in all 3pi
  nightly science versions below, WISE and SuperCOSMOS have been added
  to certain versions.  The snapshots represent stages in the
  evolution of the calibration analysis and the merge of external
  photomety.  For more detail, see the summary description for each
  database. 

  *Note that all but the first 4 DVOs are distributed with compressed
   FITS tables following the convention specified by Pense et al
   (http://arxiv.org/pdf/1201.1340v1.pdf).  This convention has not
   yet been ratified by the FITS standard, though is expected by
   Summer 2016.  As a result, standard FITS tools will have trouble
   reading these tables.  Two options which exist: 1) download the
   current IPP / Ohana tools and use these either to read the tables
   (with e.g., dvo or mana), or to uncompress the tables (with the
   program ftable).  2) download the latest version of fpack and use
   funpack to uncompress the tables.  In the later case, there is a
   small inconsistency between our implementation and funpack: if
   funpack finds the header keyword ZTILELEN and the expected output
   table length ZNAXIS2 is < ZTILELEN, funpack will fail.  (We treat
   ZTILELEN as a maximum block size, and so handle this case as we
   handle the last block in a table.  The white paper is not explicit
   in how to handle this case).  It is possible to use funpack to
   uncompress these tables by modifying the value of ZTILELEN to match
   ZNAXIS2.*

@ DVO Database         : link                  : plain : title : Comment
@ 3pi.pv0.20120509     : 3pi.pv0.20120509      : dir   : dir1  : PV0 3pi DVO Database Released 2012.05.09, ubercal + relphot + relastro (pm + par)
@ 3pi.pv0.20120525     : 3pi.pv0.20120525      : dir   : dir2  : PV0 3pi DVO Database Released 2012.05.25, ubercal + relphot + relastro (pm + par)
@ 3pi.pv0.20120606     : 3pi.pv0.20120606      : dir   : dir1  : PV0 3pi DVO Database Released 2012.06.06, ubercal + relphot + relastro (pm + par)
@ 3pi.pv0.20130227     : 3pi.pv0.20130227      : dir   : dir2  : PV0 3pi DVO Database Released 2013.02.27, ubercal + relphot + relastro (pm + par)
@ 3pi.pv0.20140621     : 3pi.pv0.20140621      : dir   : dir1  : PV0 3pi DVO Database Released 2014.06.21, ubercal + relphot + relastro (pm + par), KH effect
@ 3pi.pv0.20140713     : 3pi.pv0.20140713      : dir   : dir2  : PV0 3pi DVO Database Released 2014.07.13, ubercal + relphot + relastro (pm + par), KH effect, fixed ubercal
@ 3pi.pv1.20130708     : 3pi.pv1.20130708      : dir   : dir1  : PV1 3pi DVO Database Released 2013.07.08, ubercal + relphot + relastro (pm + par)
@ 3pi.pv2.20141212     : 3pi.pv2.20141215      : dir   : dir2  : PV2 3pi DVO Database Released 2014.12.21, ubercal + relphot + relastro (KH, DCR, pm + par)
@ 3pi.pv3.20160422     : 3pi.pv3.20160422      : dir   : dir1  : PV3.1 3pi DVO Database Released 2016.04.22, first public release database
@ 3pi.pv3.20170216     : 3pi.pv3.20170216      : dir   : dir1  : PV3.3 3pi DVO Database 2017.02.16, repaired astrometric flat-field

* Allsky Summary Tables : these files contain mean photometry data for
  a subset of brighter objects.  These files are CSV or FITS format
  tables, with one file for large regions bounded by lines of constant
  RA and DEC.

@ Allsky Summary Tables  : plain : title : Comment
@ 3pi.20120525.tables  : dir   : dir1  : Allsky Summary Tables for 3pi.20120525 (FITS & CSV formats)
@ 3pi.20130227.tables  : dir   : dir1  : Allsky Summary Tables for 3pi.20130227 (FITS & CSV formats)

* Other Useful Data : various data items of interest.  the Ubercal
  zero point tables provide an archive reference of the ubercal zero
  point tables provided by Eddie Schlafly.

@ Other useful data
@ ubercal.data         : dir   : dir1  : Ubercal zero point tables
@ dvo.tarballs         : dir   : dir2  : Tarballs for building DVO

<!-- @ catdir.syn.test      : dir   : dir1  : Test DVO Database -->
