=================== unpartitioned skies =================== :Summary: Unpartitioned DESI sky locations contain a single binary table covering the entire `Legacy Surveys`_ footprint. They will `not` be a useful data product for most users. They exist because DESI sky locations are originally generated in Legacy Surveys `bricks` before being re-partitioned into HEALPixels. The unpartitioned sky files are assembled according to which `bricks` occupy each HEALPixel rather than by which `sky locations` occupy each HEALPixel. They are purely included for completeness, and are merely a rearrangement of the DESI skies files. :Naming Convention: ``skies-hp-HP.fits-unpartitioned``, where ``HP`` is the HEALPixel covered at the (nested) HEALPixel nside included in the file header as ``FILENSID`` (*e.g.* 11). :Regex: ``skies-hp-?[0-9]+\.fits-unpartitioned`` :File Type: FITS, 2 MB - 140 MB Contents ======== ====== =========== ======== =================== Number EXTNAME Type Contents ====== =========== ======== =================== HDU0_ PRIMARY IMAGE Empty HDU1_ SKY_TARGETS BINTABLE Table of sky locations ====== =========== ======== =================== FITS Header Units ================= HDU0 ---- EXTNAME = PRIMARY This HDU has no non-standard required keywords. Empty HDU. HDU1 ---- EXTNAME = SKY_TARGETS Table of sky locations Required Header Keywords ~~~~~~~~~~~~~~~~~~~~~~~~ .. collapse:: Required Header Keywords Table .. rst-class:: keywords ======== ============= ===== ================================== KEY Example Value Type Comment ======== ============= ===== ================================== NAXIS1 136 int width of table in bytes NAXIS2 1055419 int number of rows in table AP0 0.75 float aperture radius used to calculate flux-related quantities (arcsec) SUPP F bool ``True`` if sky location are `not` derived from the `Legacy Surveys`_ DR 9 int Legacy Surveys Data Release used to find targets NPERSDEG 18000.0 float density of sky locations generated per sq. deg. HPXNSIDE 64 int HEALPix nside for column `HPXPIXEL` HPXNEST T bool HEALPix nested (not ring) ordering SUBPSEED 805 int random seed used to generate `SUBPRIORITY` values MASKED T bool ``True`` if targets were masked to avoid bright sources MASKDIR "masks/" str location of directory of masks used to avoid bright sources CMDLINE "/global/" str command-line call used to generate target file FILENSID 2 int HEALPix nside covered by file FILENEST T bool HEALPix nested (not ring) ordering FILEHPX 11 int HEALPix pixel(s) covered by file ======== ============= ===== ================================== Required Data Table Columns ~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. rst-class:: columns ================================= ========== ======= =================== Name Type Units Description ================================= ========== ======= =================== RELEASE int32 Legacy Surveys (`LS`_) `Release`_ BRICKID int32 Brick ID from tractor input BRICKNAME char[8] Brick name from tractor input BRICK_OBJID int32 OBJID (unique to brick, but not to file) RA float64 deg Right ascension DEC float64 deg Declination BLOBDIST float32 pix Maximum distance from a detected `Legacy Surveys`_ source FIBERFLUX_G float32 g-band object model flux calculated in aperture of radius ``AP0`` FIBERFLUX_R float32 r-band object model flux calculated in aperture of radius ``AP0`` FIBERFLUX_Z float32 z-band object model flux calculated in aperture of radius ``AP0`` FIBERFLUX_IVAR_G float32 Inverse Variance of ``FIBERFLUX_G`` FIBERFLUX_IVAR_R float32 Inverse Variance of ``FIBERFLUX_R`` FIBERFLUX_IVAR_Z float32 Inverse Variance of ``FIBERFLUX_Z`` TARGETID int64 Unique targeting ID DESI_TARGET int64 DESI (dark time program) target selection bitmask BGS_TARGET int64 BGS (bright time program) target selection bitmask MWS_TARGET int64 MWS (bright time program) target selection bitmask SUBPRIORITY float64 Random subpriority [0-1] to break assignment ties OBSCONDITIONS int64 Flag target to be observed in combinations of dark/bright observing layer PRIORITY_INIT int64 Initial priority for target calculated across target selection bitmasks and OBSCONDITIONS NUMOBS_INIT int64 Initial number of observations for target calculated across target selection bitmasks and OBSCONDITIONS HPXPIXEL int64 HEALPixel containing sky location ================================= ========== ======= =================== .. _`Legacy Surveys`: http://legacysurvey.org .. _`LS`: http://legacysurvey.org/dr9/catalogs/ .. _`ellipticity component`: http://legacysurvey.org/dr9/catalogs/ .. _`Release`: http://legacysurvey.org/release/ .. _`Morphological Model`: http://legacysurvey.org/dr9/catalogs/ .. _`Tycho-2`: https://heasarc.nasa.gov/W3Browse/all/tycho2.html .. _`Gaia`: https://gea.esac.esa.int/archive/documentation//GDR2/Gaia_archive/chap_datamodel/sec_dm_main_tables/ssec_dm_gaia_source.html