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WERA Radial Components on a Cartesian Grid
Each file contains all information required to describe a radial current map.
The file name is encoded in yyyydddhhmm_ccc.rad_lst with
yyyy = 2002 (year, 1999, 2002)
ddd = 032 ... 092 (day within the year, e.g. 01-Feb to 31-Mar)
hh = 00 ... 23 (hour)
mm = 00 ... 59 (minutes)
ccc = nic (code for experiment, e.g. nic = Nice)
cur = cur / wav (cur indicating data set for 'currents')
(wav indicating data set for 'waves')
The time is given in UTC and indicates the starting time
of the measurement.
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The structure within the file is as follows (example from the EuroROSE Gijon
experiment):
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29-NOV-2000 14:05 UTC Cabo-Penas 43.65667 N 5.84167 W CIT= 532 sec
LAT(1,1) LON(1,1) DGT[km] NX NY
---------------------------------------
44.09666 -5.86667 1.000 60 60
1371
IX IY Vel. [m/s] Acc. [m/s] Var. [m/s] Power
------------------------------------------------------------
4 47 0.28186 0.02824 0.16467 0.24818835E+11
4 48 0.30255 0.02564 0.14953 0.94194655E+11
4 49 0.33084 0.02209 0.12882 0.27548581E+14
4 50 0.11004 0.01262 0.07358 0.83063981E+13
5 43 0.52688 0.02511 0.14640 0.10013001E+10
....
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The first line gives:
date/time of the start of the measurement,
name of the site,
LAT / LON of site,
and if ' CIT=' exists, the coherent integration time.
The next line is empty.
The next three lines give the description of the measurement grid
followed by the actual values:
LAT(1,1), LON(1,1) -- upper left corner of the grid in degrees
West, South -> negative values
DGT[km] -- grid spacing in LAT and LON direction in kilometers
NX -- number of grid points in East direction
NY -- number of grid points in South direction
FORMAT(x,f9.5,x,f10.5,f9.3,2(x,i4))
The next line is empty.
The next line gives the number N of data lines in the file to
follow after the description lines.
FORMAT(x,i8)
The next two lines decribe the parameters of the following
N data lines:
IX East count of measurement grid
IY South count of measurement grid
Vel.[m/s] Radial component of the surface current
Acc.[m/s] Accuracy of the radial component of the surface current
Var.[m/s] Variance of the radial component of the surface current
Power Relative power
FORMAT(X,I3,X,I3,3(X,F11.5),2X,E15.8)
Look here to find out how
accuracy and variance of the radial current vectors are calculated.
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Grid points with missing measurement values due to a change in working
range of the radar or influence of noise are omitted.
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Comments to:
gurgel@ifm.uni-hamburg.de
(Klaus-Werner Gurgel)