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


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


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


-i catalog
Input FITS catalog: source RA,DEC, etc.

-e extension
FITS extension to read when -i is specified.

-1 index
Share another index's stars (alternatively to -i/-e).

-o file
Output filename for index

-N nside
Healpix Nside for quad-building

-l size
Minimum quad size (arcminutes)

-u size
Maximum quad size (arcminutes)

-P number
Use 'preset' values for -N, -l, and -u. The scale-number is the last two digits of
the pre-cooked index filename -- eg., index-205 is -P 5.

-P 0 should be good for images about 6 arcmin in size and it goes in steps of
sqrt(2), so:

-P 2 should work for images about 12 arcmin across

-P 4 should work for images about 24 arcmin across

-P 6 should work for images about 1 degree across

-P 8 should work for images about 2 degree across

-P 10 should work for images about 4 degree across etc... up to -P 19

-S column
Sort column (default: assume the input file is already sorted)

-f Sort in descending order (eg, for FLUX); default ascending (eg, for MAG)

-A column
Specify the RA column name in the input FITS table (default "RA")

-D column
Specify the Dec column name in the input FITS table (default "Dec")

-B val Cut any object whose sort-column value is less than val; for mags this is a bright

-U Healpix Nside for uniformization (default: same as -n)

-H big healpix
Big healpix; default is all-sky

-s Nside
Big healpix Nside; default is 1

-m margin
Add a margin of margin healpixels; default 0

-n sweeps
Sweeps (ie, number of stars per fine healpix grid cell); default 10

-r radius
Deduplication radius in arcseconds; default no deduplication

-j jitter
Positional error of stars in the reference catalog (in arcsec; default 1)

-d dimquads
Number of stars in a "quad" (default 4).

-p passes
Number of rounds of quad-building (ie, number of quads per healpix cell, default

-R reuse
Number of times a star can be used (default: 8)

-L max-reuses
Make extra passes through the healpixes, increasing the -r reuse limit each time,
up to max-reuses.

-E Scan through the catalog, checking which healpixes are occupied.

-I id Set the unique ID of this index

-M In-memory (don't use temp files)

-T Don't delete temp files

-t dir Use this temp directory (default: /tmp)

-v Add verbosity.

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