Data model: boss_locations

General description: File containing locations of potential BOSS tiles. The locations listed here do not necessarily correspond to actual designed tiles, which can be found in the bosstiles.par file. The file is given in multiple formats. It also contains the geometrical description in terms of spherical polygons (in this case just a single cap) in the style of the mangle software product.

Naming convention: boss_locations.fits, boss_locations.par, boss_locations.ply

Approximate size: 300 kbytes.

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
• LOCATIONID (int32): identification number for this location
• AREANAME (string): which part of the survey this tile is in ('SGC' or 'NGC')
• RA (float64): center in right ascension, J2000 deg
• DEC (float64): center in declination, J2000 deg

Example file: boss_locations.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".