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WERA HF Radar Software - Combine Radial Wave Components

wrad2uv

Call: wrad2uv [params*.cfg]

An optional parameter can be used to pass the name of a configuration file. This file must be located in ~/etc e.g. ~/etc/params_Hawaii.cfg . If no optional parameter is supplied, the configuration is read from ~/etc/params.cfg . Note, that you only have to pass the file name. The directory ~/etc/ is hard-wired within wrad2uv.

As of December 2007, this program calculates the range and azimuth from the WERA site to the grid points given in WGS84 coordinates. When evaluating 2nd-order sidebands at a grid point, the WGS84 backward angles from the grid point to the radar site are used. Note, that due to the great circle approach, foreward and backward angle do not always differ by 180 degrees.

Program expects 'FMWRAD' header code.
Look here for a complete list of header codes.

Program looks for files containing names of .wrad files to be combined:
/home/wera/etc/WRADnam1.dat,
/home/wera/etc/WRADnam2.dat, ...,
/home/wera/etc/WRADnam10.dat
e.g. 

/home/wera/etc/WRADnam1.dat : /home/wera/data/gar/20052501800_gar.wrad
/home/wera/etc/WRADnam2.dat : /home/wera/data/bre/20052501800_bre.wrad
Note, that if data from only one site is available, the wave direction can not be processed and significant wave height is calculated only. If 2nd order sidebandes from two sites are available, wave height and wave direction for 21 wave frequencies from 0.05 Hz to 0.25 Hz is calculated. If 2nd order sidebandes from more than two sites are available, wave height and wave direction is calculated using a least-squares solution.

The program reads following values from PARAM_UV.CFG (VMS) / params.cfg (Linux): 

C	Maximum number of WRADnamX.dat files defined by NST
C
        NST             =  2            !Number of WERA sites (radial files)

C	Name and size (NX, NY) of Grid File
C
C	Values used to generate Gijon_grid_60_60.asc :
C	Spacing [km] 1.0
C	Upper left corner: LAT 44 5.8  LON -5 -52.0
C
	NX              = 60
	NY              = 60
	GRID_NAME	= '/home/wera/etc/Gijon_grid_60_60.asc'

	WASC_DIR         = '/home/wera/data/asc/' !Directory for wave parameters
        !
	CODE 		= 'gij' 	!Code in .wav_asc/.win_asc file name

C	Parameters for WERA16_SPEC_CWrad / wrad2uv
C
	WERA_Waves	= .TRUE.	!.true. = process waves
	WERA_Wind	= .TRUE.	!.true. = process wind direction



Two files are written:

1. <time_code>_<CODE>.wav_asc
2. <time_code>_<CODE>.win_asc

<time_code> is taken from the first .wrad file e.g. in WRADnam1.dat
and has the form yyyydddhhmm:  year,day_in_year,hour,minute
            e.g. 20003341355   Year 2000, Day 334, Hour 13, Minute 55
The following box shows a typical output generated by wrad2uv: 

wera@ifmpc205:~/Fortran> wrad2uv params_brest.cfg

 wrad2uv V2.0.0 Linux:
 *** Reading configuration from /home/wera/etc/params_brest.cfg
 Now processing : /home/wera/data/gar/cwrad/20052490624_gar.wrad
 Now processing : /home/wera/data/bre/cwrad/20052490624_bre.wrad
 *** Calculate wind direction.
 *** Calculate waveheight and direction.
 Wave result in: /home/wera/data/asc/20052490624_sur.wav_asc
 Wind result in: /home/wera/data/asc/20052490624_sur.win_asc

Here is the data format of the
wave output (.wav_asc) file and the
wind output (.win_asc) file.

Compilation from source: 
Linux:

Source is in wrad2uv.F
Compilation and linking with '. do_wrad2uv.sh'

After passing the input radial files via WRADnamNN.dat, call with
> wrad2uv


VMS:

Source is in wrad2uv.F
Compilation and linking with @wrad2uv

After passing the input radial files via WRADnamNN.dat, call with
$ run wrad2uv

Comments to: gurgel@ifm.uni-hamburg.de (Klaus-Werner Gurgel)