Data model: boss_geometry

General description: The full BOSS geometry, composed of the full list of tiles and the photometric geometry (as defined by the boss_survey file in the bosstarget product. Expressed in terms of spherical polygons in the style of the mangle software product. This file refers to sector numbers (as tracked in the boss_sector2tile and boss_sectors 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: boss_geometry.fits, boss_geometry.par, boss_geometry.ply

Approximate size: 20 Mbytes.

File type: FITS, Yanny, and Mangle-style (all provided)

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 from global idealized geometry (NOT going to be equal to the final sector number for the actual survey).

Example file: boss_geometry.par

For IDL users, this file is given in a "FITS" mangle format, readable by the idlutils routine "read_fits_polygons", and in a "Yanny" mangle format, readable by "read_yanny_polygons".