build-astrometry-index(1)

1BUILD-ASTROMETRY-INDEX(1)       astrometry.net       BUILD-ASTROMETRY-INDEX(1)
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NAME

6       build-astrometry-index - Create astrometry.net index files
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SYNOPSIS

9       build-astrometry-index [options] -i catalog -o file -P scale
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DESCRIPTION

12       build-astrometry-index  takes  a FITS catalog table containing at least
13       RA, DEC, and magnitude columns and converts it into an index file  that
14       can be used by the astrometry.net programs like solve-index (1).
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OPTIONS

17       -i catalog
18              Input FITS catalog: source RA,DEC, etc.
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20       -e extension
21              FITS extension to read when -i is specified.
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23       -1 index
24              Share another index's stars (alternatively to -i/-e).
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26       -o file
27              Output filename for index
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29       -N nside
30              Healpix Nside for quad-building
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32       -l size
33              Minimum quad size (arcminutes)
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35       -u size
36              Maximum quad size (arcminutes)
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38       -P number
39              Use  'preset' values for -N, -l, and -u. The scale-number is the
40              last two  digits  of  the  pre-cooked  index  filename  --  eg.,
41              index-205 is -P 5.
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43              -P  0  should  be  good for images about 6 arcmin in size and it
44              goes in steps of sqrt(2), so:
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46              -P 2 should work for images about 12 arcmin across
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48              -P 4 should work for images about 24 arcmin across
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50              -P 6 should work for images about 1 degree across
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52              -P 8 should work for images about 2 degree across
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54              -P 10 should work for images about 4 degree across etc... up  to
55              -P 19
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57       -S column
58              Sort column (default: assume the input file is already sorted)
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60       -f     Sort  in descending order (eg, for FLUX); default ascending (eg,
61              for MAG)
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63       -A column
64              Specify the RA  column name in the  input  FITS  table  (default
65              "RA")
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67       -D column
68              Specify  the  Dec  column  name in the input FITS table (default
69              "Dec")
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71       -B val Cut any object whose sort-column value is  less  than  val;  for
72              mags this is a bright limit
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74       -U     Healpix Nside for uniformization (default: same as -n)
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76       -H big healpix
77              Big healpix; default is all-sky
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79       -s Nside
80              Big healpix Nside; default is 1
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82       -m margin
83              Add a margin of margin healpixels; default 0
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85       -n sweeps
86              Sweeps (ie, number of stars per fine healpix grid cell); default
87              10
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89       -r radius
90              Deduplication radius in arcseconds; default no deduplication
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92       -j jitter
93              Positional error of stars in the reference catalog  (in  arcsec;
94              default 1)
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96       -d dimquads
97              Number of stars in a "quad" (default 4).
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99       -p passes
100              Number  of  rounds  of  quad-building  (ie,  number of quads per
101              healpix cell, default 16)
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103       -R reuse
104              Number of times a star can be used (default: 8)
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106       -L max-reuses
107              Make extra passes through the healpixes, increasing the -r reuse
108              limit each time, up to max-reuses.
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110       -E     Scan through the catalog, checking which healpixes are occupied.
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112       -I id  Set the unique ID of this index
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114       -M     In-memory (don't use temp files)
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116       -T     Don't delete temp files
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118       -t dir Use this temp directory (default: /tmp)
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120       -v     Add verbosity.
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AUTHOR

123       The  Astrometry.net  team.  Principal  investigators  are David W. Hogg
124       (NYU) and Dustin Lang (CMU).
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NAME

SYNOPSIS

DESCRIPTION

OPTIONS

AUTHOR

SEE ALSO