[gradsusr] Global Control File Issue

[L.B.]

I'm having an issue with a pesky control file that I created for a binary
file that I wrote out with GrADS using the fwrite function.

I have a large dataset of multiple grib2 files containing 500mb
Geopotential by year. I used templating in the control file to run through
all the grib files. Here is the control file for that data:

dset ^ERA5_500GEO_%y4.grb2
index ^ERA5_500GEO_Climo.grb2.idx
undef 9.999E+20
options template
title ERA5_500GEO_Climo
* produced by g2ctl v0.1.4
* griddef=1:0:(1440 x 721):grid_template=0:winds(N/S): lat-lon grid:(1440 x
721) units 1e-06 input WE:NS output WE:SN res 48 lat 90.000000 to
-90.000000 by 0.250000 lon 0.000000 to 359.750000 by 0.250000
#points=1038240:winds(N/S)

dtype grib2
ydef 721 linear -90.00 0.25
xdef 1440 linear 0.00 0.25
tdef 58440 linear 00Z01JAN1979 6hr
zdef 1 linear 1 1
vars 1
GP500mb   0,100,50000   0,3,4 ** 500 mb Geopotential [m^2/s^2]
ENDVARS

>From here, I created a script to further reduce the size fo the climatology
file by writing out to a binary file the average 500mb geopotential height
every 6 hours for one year (data starts in 1979, but I started the script
in 1980 to include a leap year to get Feb 29th - hence why I used 1461 for
the first timestep).

The script that outputs the 6hour average is here:

'reinit'
'open ERA5_500GEO.ctl'
'set gxout fwrite'
'set fwrite 500HGT_Climo.dat'

tt=1461

 while (tt<=2924)
     'set t 'tt
     'q dims'
     rec=sublin(result,5)
     vdate=subwrd(rec,6)
     vday=substr(vdate,1,8)
     say vday

     if (vday=00Z29FEB | vday=06Z29FEB | vday=12Z29FEB | vday=18Z29FEB)

 'mean=(GP500mb(time='vday'1980)+GP500mb(time='vday'1984)+GP500mb(time='vday'1988)+GP500mb(time='vday'1992)+GP500mb(time='vday'1996)+GP500mb(time='vday'2000)+GP500mb(time='vday'2004)+GP500mb(time='vday'2008)+GP500mb(time='vday'2012)+GP500mb(time='vday'2016))/10'

     else


 'mean=(GP500mb(time='vday'1979)+GP500mb(time='vday'1980)+GP500mb(time='vday'1981)+GP500mb(time='vday'1982)+GP500mb(time='vday'1983)+GP500mb(time='vday'1984)+GP500mb(time='vday'1985)+GP500mb(time='vday'1986)+GP500mb(time='vday'1987)+GP500mb(time='vday'1988)+GP500mb(time='vday'1989)+GP500mb(time='vday'1990)+GP500mb(time='vday'1991)+GP500mb(time='vday'1992)+GP500mb(time='vday'1993)+GP500mb(time='vday'1994)+GP500mb(time='vday'1995)+GP500mb(time='vday'1996)+GP500mb(time='vday'1997)+GP500mb(time='vday'1998)+GP500mb(time='vday'1999)+GP500mb(time='vday'2000)+GP500mb(time='vday'2001)+GP500mb(time='vday'2002)+GP500mb(time='vday'2003)+GP500mb(time='vday'2004)+GP500mb(time='vday'2005)+GP500mb(time='vday'2006)+GP500mb(time='vday'2007)+GP500mb(time='vday'2008)+GP500mb(time='vday'2009)+GP500mb(time='vday'2010)+GP500mb(time='vday'2011)+GP500mb(time='vday'2012)+GP500mb(time='vday'2013)+GP500mb(time='vday'2014)+GP500mb(time='vday'2015)+GP500mb(time='vday'2016)+GP500mb(time='vday'2017)+GP500mb(time='vday'2018))/40'

     endif

      'd mean/9.80665'

  tt=tt+1
 endwhile

'disable fwrite'

The control file for this binary file named: 500HGT_Climo.dat is where I am
having the issue. The control file is below:

dset ^500HGT_Climo.dat

title ERA5 500 hPa Height Climatology 1979 to 2018
undef 9.999E+20

ydef 721 linear -90.00 0.25
xdef 1440 linear 0.00 0.25
tdef 1464 linear 00Z01JAN1980 6hr
zdef 1 linear 1 1
vars 2
 hgt500mean         1  99  500 hPa Mean Geopotential Height [gpm]
ENDVARS

If I were to just plot the first timestep from this binary file, I would
get the first image attached named: 'fromdatfile.png'. This image is wrong,
however. The correct one (attached) is named: 'fromscript.png'. I can run
that same 6 hour average script but change it to output a contoured image,
and it is correct (the output is the 'fromscript.png' image). However, that
same exact code, when written to binary format and then plotted is wrong.
Somehow the control file is messing up, but I cannot figure out where.

I have tested the 6hour average script using a smaller domain than global
(just the US) and adjusted the control file accordingly and it works fine,
but the full global domain doesn't want to plot correctly with that control
file. Any ideas on what might be going on? Thanks!
*-------*
William (L.B.) LaForce IV
Meteorologist
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