Next Previous Up Contents
Next: Usage
Up: Command Reference
Previous: Examples


B.31 tmatch2: Crossmatches 2 tables using flexible criteria

tmatch2 is an efficient and highly configurable tool for crossmatching pairs of tables. It can match rows between tables on the basis of their relative position in the sky, or alternatively using many other criteria such as separation in some isotropic or anisotropic Cartesian space, identity of a key value, or some combination of these; the full range of match criteria is discussed in Section 7.1. You can choose whether you want to identify all the matches or only the closest, and what form the output table takes, for instance matched rows only, or all rows from one or both tables, or only the unmatched rows.

If you simply want to match two tables based on sky position with a fixed maximum separation, you may find the tskymatch2 command easier to use.

Note: the duptag1 and duptag2 parameters have been replaced at version 1.4 by suffix1 and suffix2 for consistency with other table join tasks.


Next Previous Up Contents
Next: Usage
Up: Command Reference
Previous: Examples

STILTS - Starlink Tables Infrastructure Library Tool Set
Starlink User Note256
STILTS web page: http://www.starlink.ac.uk/stilts/
Author email: m.b.taylor@bristol.ac.uk
Mailing list: topcat-user@jiscmail.ac.uk