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Since version 0.12, libAIR comes with a simple command line interface to the routines which retrieve the water vapour and the phase correction coefficient. Currently only the very simplest model is supported, in which the all of pressure, temperature and water vapour column are free parameters, and they are inferred from the four observed water vapour radiometer readings.
The programs are located in the cmdline
directory of the library
package. See Building libAIR for instructions for building of
the library. You need to have at least libAIR V0.12 and BNMin1 V1.8 to
use the command-line programs.
To get help on usage of the program use the –help option:
./wvrretrieve --help
Make a retrieval of water vapour and correction coefficients from WVR data
This program is part of LibAIR version 0.19
GPL license -- you have the right to the source code. See COPYING
You should supply the observed WVR temperatures as four positional arguments:
e.g.:
./wvrretrieve <Ch1Temp> <Ch2Temp> <Ch3Temp> <Ch4Temp>
where channels are numbered from line centre out
Allowed options:
--version Print the name and version of the program
--help Print (this) help message
--wvrtemp arg Temperature recorded by WVR, from innermost channel
outward
--elevation arg (=90) Elevation of observation in degrees
--cont Try to constrain the continuum
--osf Apply priors suitable for the OSF (if this option is
not use then priors are for AOS)
An example invocation of the program is:
./wvrretrieve 280.457 228.251 150.674 111.533
Evidence: 2.07525e-14
-- Parameters --
c: 5.31315 +/- 0.118196
-- Phase Correction Coefficients --
dTdL0: 0.279412 +/- 0.000844754
dTdL1: 2.34219 +/- 0.00567481
dTdL2: 2.95852 +/- 0.00458467
dTdL3: 2.46791 +/- 0.00316159
Here 280.457 228.251 150.674 111.533 are the four brightness temperatures recorded by the WVR (this was relatively wet weather at the OSF). The remainder of the text is the output from the program: