Data model: sdss_tiling_polygons
General description:
List of SDSS-I, -II polygons defining the full tiling region.
with corresponding geometrical information. This geometrical
information is in mangle-type format (see the mangle documentation
for a full explanation).
Naming convention:
sdss_tiling_polygons.fits
Approximate size:
300 kbytes.
File type:
FITS
Read by products:
sas
Written by products:
sas
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): right ascension of point near polygon center in J2000
deg
- DEC (float64): declination of point near polygon center in J2000
deg
- SECTOR (int32): sector number (unique overlap of tiles)
- FIRSTBOUNDARY (int32): index in sdss_boundaries file that this polygon
was targeted in
For IDL users, this file is in a "FITS" mangle format, readable by
the idlutils routine "read_fits_polygons".