This component provides a mechanism to apply limits to the times present in data. This includes absolute limiting as well as limiting based on distance from the start or end of the data present.

Usage

da.time.limit [switches…​] [[station] variables times [archive]|[file]]

Switches

--end=TIME

This is the end time to output data. If this is set then no data after this time is output.

--exclude-end=INTERVAL

This if the maximum time accepted before the end of the last defined value time. That is, data that falls inside this interval from the end are rejected.

Default: Unlimited

The interval must be greater than zero in length.

--exclude-start=INTERVAL

This if the minimum time accepted after the start of the first defined value time. That is, data that falls inside this interval from the start are rejected.

Default: Disabled

The interval must be greater than zero in length.

--include-end=INTERVAL

This if the minimum time accepted before the end of the last defined value time. That is, data that falls outside this interval from the end are rejected.

Default: Unlimited

The interval must be greater than or equal to zero length.

--include-start=INTERVAL

This if the maximum time accepted after the start of the first defined value time. That is, data that falls outside this interval from the start are rejected.

Default: Unlimited

The interval must be greater than or equal to zero length.

--start=TIME

This is the start time to output data. If this is set then no data before this time is output.

Arguments

If no bare word input specification is supplied then data are read from standard input.

station

This argument is used to specify the station used to look up variables that do not include a station as part of an archive read specification. The station is the three letter GAW station code of the location, such as BND. The argument accepts multiple stations specified as regular expressions and separated by : or ; or ,. For example BND,MLO and (BND|MLO) are two ways of selecting both the BND and MLO stations.

The special value allstations may also be specified to select all stations.

variables

This argument may be split into multiple actual program arguments. Each part consists of one or more variable specifications separated by , (commas). The station and archive used if none are explicitly given are defined in the other arguments or inferred from system defaults. For example simply BsB_S11 selects the blue scattering from the S11 instrument and returns all cut sizes and metadata. If instead ::BsB_S11:pm10 is used then only PM10 scattering is returned. That is, the selection specifies "any" station and archive (the defaults are set in the other arguments) then requires that it has the "PM10" flavor. A specification such as bnd:BsB_S11,thd:BsB_S11 allows for data selection from multiple stations.

This may also be used to select a "record" type alias such as "S11a". In this mode all the variables defined in the alias are returned.

Finally the special value everything can be used to select all available data for the given station(s) and archive(s).

times

This argument may be split into multiple actual program arguments. This full list of time arguments defines a time bounds list that sets the range of data queried. The final resulting data are clipped to the given time bounds but any values that intersect them are returned.

archive

This argument is used to specify the archive used to look up variables that do not include an archive as part of an archive read specification. The archive is the internal name, such as raw or clean_meta. The argument accepts multiple archives specified as regular expressions and separated by : or ; or ,. For example raw(_meta)? selects both the raw and raw_meta archives.

The special value allarchives may also be used to select all available archives.

file

This argument is used to specify the the file to read data from. If it is present and exists then data is read from the given file name instead of from standard input. Alternatively - (a single dash) may be used to explicitly specify standard input.