fitfilter

Syntax

fitfilter --help
fitfilter [options] fitacfname [inxname]
fitfilter -old [options] fitname [inxname]
fitfilter -cfit [options] cfitname
fitfilter -old -cfit [options] cfitname
fitfilter -c [options] fitacfnames...
fitfilter -c -old [options] fitnames...
fitfilter -c -cfit [options] cfitnames...
fitfilter -c -old -cfit [options] cfitnames...

Synopsis

Median filters data to produce a cfit format file from either a fit, fitacf or cfit format file.

Options

`--help`	print the help message and exit.
`--version`	print the RST version number and exit.
`-vb`	verbose. Log information to the console.
`-sd yyyymmdd`	start from the date yyyymmdd.
`-st hr:mn`	start from the time hr:mn.
`-ed yyyymmdd`	stop at the date yyyymmdd.
`-et hr:mn`	stop at the time hr:mn.
`-ex hr:mn`	use the interval whose extent is hr:mn.
`-tl tlen`	ignore the scan flag and instead use a fixed length scan of tlen seconds.
`-cn channel`	process data from channel channel for stereo mode data.
`-ebm ebeams`	exclude the beams listed in ebeams, which is a comma separated list of beam numbers.
`-minrng minrange`	exclude data from range gates lower than minrange.
`-maxrng maxrange`	exclude data from range gates higher than maxrange.
`-fwgt mode`	set the filter weighting mode to mode.
`-pmax pmax`	exclude data with a power greater than pmax.
`-vmax vmax`	exclude data with an absolute velocity greater than vmax.
`-wmax wmax`	exclude data with a spectral width greater than wmax.
`-vemax vemax`	exclude data with a velocity error greater than vemax.
`-pmin pmin`	exclude data with a power less than pmin.
`-vmin vmin`	exclude data with an absolute velocity less than vmin.
`-wmin wmin`	exclude data with a spectral width less than wmin.
`-vemin vemin`	exclude data with a velocity error less than vemin.
`-fmax fmax`	set the maximum allowed variation in frequency to be fmax Hertz.
`-nav`	do not perform temporal averaging.
`-nlm`	do not exclude data because it exceeds the data limits.
`-nb`	do not exclude data based on the operating parameters.
`-isort`	calculate the median power and spectral width independently of the velocity distribution.
`-ion`	exclude data marked as ground scatter.
`-gs`	exclude data marked as ionospheric scatter.
`-both`	do not exclude data based on the type flag.
`fitacfname`	filename of the `fitacf` format file.
`inxname`	filename of the index file.
`-old`	the input file is in the `fit` format.
`fitname`	filename of the `fit` format file.
`-cfit`	the input file is in the `cfit` format.
`cfitfname`	filename of the `cfit` format file.
`-c`	concatenate multiple input files.
`fitacfnames`	filenames of the `fitacf` format files.
`fitnames`	filenames of the `fit` format files.
`cfitnames`	filenames of the `cfit` format files.

Description

Median filters data to produce a cfit format file from either a fit, fitacf or cfit format file.

The task applies a median filter to the radar data to remove noise. Each range-beam cell together with its immediate neighbors in the current, preceding and following scans is examined. A weighted sum of all the cells containing scatter is calculated and if this sum exceeds a certain threshold, the median data value of the cells is substituted for the central cell. Various command line options control how the filter is applied.

The filtered data is stored in a cfit format file written to standard output.

Examples

fitfilter -vb -old 19991120.kap.fit > 19991120.kap.cfit

Generate a cfit file from the fit file "19991120.kap.fit" and store it in the file "19991120.kap.cfit". Report the status on standard error.

fitfilter -c -old -cfit 20000510.*.kod.cfit > 20000510.kod.cfit.filtered

Concatenate all the cfit files in the current directory to create a filtered cfit file. Store the output in the file "20000510.kod.cfit.filtered".