Data model: geometry-bossN
General description: Geometrical information describing coverage
of this chunk.
Expressed in terms of spherical polygons
in the style of the mangle software
product. This file refers to sector numbers (as tracked in the stpair-bossN and sector-bossN files); however, these
sector numbers will not correspond to the final ones for the survey,
which will be complicated by the edges between chunks.
Naming convention:
geometry-bossN.fits
Approximate size:
100 kbytes.
File type:
FITS
Read by products:
bosstile
Written by products:
bosstile
Required column names:
- XCAPS[3, NCAPS] (float64): direction of cap defining tiling
geometry, on unit sphere
- CMCAPS[NCAPS] (float64): size of each
cap defining the field
- NCAPS (int32): number of caps (should be 1 for this
file)
- USE_CAPS (int32): bitmask containing which caps to
actually use
- WEIGHT (float64): weight for polygon (should be 1 for this
file)
- PIXEL (int32): pixel # (should be -1, no
pixelization)
- STR (float64): area in steradians of polygon
- RA (float64): "center" position of polygon in right
ascension, J2000 deg
- DEC (float64): "center" position of polygon in
declination, J2000 deg
- AREANAME (string): which part of the survey this polygon is
in ('SGC' or 'NGC')
- IBOSS (int32): which polygon from the boss_survey
file this polygon is in.
- SECTOR (int32): sector number within chunk that this
polygon belongs too (NOT
going to be equal to the final sector number for the actual
survey). See sector-bossN file for
information on sectors.
- NTILES (int32): number of tiles covering this
polygon/sector
- RAMID (float64): right ascension of a point near center of
polygon, J2000 deg
- DECMID (float64): declination of a point near center of
polygon, J2000 deg
Example file:
geometry-boss1.fits