meta
Usage:
meta [<item> ...]
Provides information about the metadata for each column. This filter turns the table sideways, so that each row of the output corresponds to a column of the input. The columns of the output table contain metadata items such as column name, units, UCD etc corresponding to each column of the input table.
By default the output table contains columns for all metadata items for which any of the columns have non-blank values.
However, the output may be customised by supplying
one or more <item>
headings,
in which case exactly those columns will appear,
regardless of whether they have entries.
It is not an error
to specify an item for which no metadata exists in any of
the columns (such entries will result in empty columns).
Some of the metadata items commonly found are:
Index
: Position of column in tableName
: Column nameClass
: Data type of objects in columnShape
: Shape of array valuesElSize
: Size of each element in column (mostly useful for strings)Units
: Unit stringDescription
: Description of data in the columnUCD
: Unified Content DescriptorUtype
: Type in data modelXtype
: Extended data typeCoosysSystem
: Sky coordinate system name from COOSYSCoosysEpoch
: Sky epoch from COOSYSCoosysEquinox
: Sky equinox from COOSYSTimesysTimeorigin
: Time origin from TIMESYSTimesysTimescale
: Timescale from TIMESYSTimesysRefposition
: Ref position from TIMESYSSTIL_HPX_LEVEL
: Level of HEALPix pixels contained in the table (nside=2^level)STIL_HPX_ISNEST
: True for NEST indexation scheme, False for RINGSTIL_HPX_COLNAME
: Name of the table column containing HEALPix index; null value or empty string indicates implicitSTIL_HPX_CSYS
: 'C'=celestial/equatorial, 'G'=galactic, 'E'=eclipticAny table parameters of the input table are propagated to the output one.