chilplot
This program produces quicklooks from Chilbolton-format radar
data. The processing options are shared with
chilplot,
chil2nc and
loadchil,
and are described here. Additional options
are given below. For cloud time-height sections you may find it
convenient to convert the data to netCDF and
then plot it using cloudncplot.
General plotting options
- -png
- Produce PNG images. This is the default.
- -eps, -ps
- Produce encapsulated postscript images. These files can be
incorporated into documents or sent directly to a postscript printer.
- -oneplot
- Produce only one plot and send it to standard output rather than a
file.
- -prefix s
- Put the images in the directory s.
- -xfs s
- Contact the X font server s. By default the
program tries to contact unix/:7100, but this is not always
the appropriate port to use; under RedHat Linux 6.0 you should use
`-xfs unix/:-1'. If X is running then you can find the
address of the font server by running `xset -q'. In XFree86
version 4.0 the font server has been incorporated with the X server,
so an X font server needs to be run independently: as root run
`xfs -port 7100'. Unfortunately at present there are no
fall-back fonts built into the program.
- -heightrange f1 f2
- Set the height range (y-axis of cloud plots, RHIs and FIXEDs) to
be from f1 km to f2 km.
- -Zrange f1 f2
- Set the range of the radar reflectivity colour scale to be from
f1 dBZ to f2 dBZ.
- -LDRrange f1 f2
- Set the range of the linear depolarisation ratio to be from
f1 dB to f2 dB.
- -PHIDPrange f1 f2
- Set the range of the differential phase shift colour scale to be from
f1 degrees to f2 degrees.
- -fontsize n
- Set the size of the font (default 12).
- -mag f
- Set the magnification factor (default 1, max 10, min 0.01).
- -maxsize d
- If the pseudo-colour image is larger than d pixels in
either direction then scale it down accordingly. This is useful if you
don't like those 360 degree PPIs very much.
Plotting options specific to scanning data
- -locations s
- Read the locations of cities/landmarks from the ascii file
s and plot them on PPIs. The format is simple - the
first line of the file contains the number of locations in the file,
which are specified as the name of the place followed by its distance
east and distance north (in km) from the radar. A sample file for
towns in the vicinity of Chilbolton could be:
11
Chilbolton 0 0
Southampton 2 -27
Reading 34 32
Chilton 9 46
Bristol -80 32
London 90 40
Bournemouth -32 -49
Guildford 60 10
Oxford 13 65
Salisbury -35 -10
Portsmouth 25 -40
This file can also be found at
PREFIX/share/chilplot/locations.dat (where PREFIX
is usually /usr/local). The first line is the number of
locations in the file.
- -coastline s
- Read coastline data from the ascii file s and plot
it on PPIs. The file format is simple: the first line is the number of
coast points, and the rest of the file consists of longitude and
latitude values. The -999 -999 pair indicates a break in the
line. A file containing the UK coastline can be found at
PREFIX/share/chilplot/coast.dat. Please note that this
feature is very experimental at the moment - coast-lines drawn on
postscript images don't clip to the axis, and breaks in the coastline
don't work properly.
- -rrange f1 f2
- Set the horizontal axis range for RHIs to be from
f1 km to f2 km.
- -fixduration f
- Set the duration of FIX plots to f minutes.
Plotting options specific to cloud data
- -hourrange f1 f2
- Plot data from f1 UTC to f2
UTC. If the -all or -data
options are used then, by default, a whole day will be
plotted. Otherwise the default is to plot 6 hours of data starting at
the time of the first ray. See also the -duration option.
- -duration f
- If the -hourrange, -all and -date
options are not specified, then the plots will start at the time of
the first ray and proceed for f hours.