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bugs in gdprof and gdpoint
- Subject: bugs in gdprof and gdpoint
- Date: Thu, 24 Nov 2005 03:01:07 -0800
Hello,
I have discovered the following bugs in GEMPAK 5.8.3a (Unidata binary
version and my compiled and patched versions).
In gdprof and gdpoint the use of MUL(urel,urel) and MAG(WND) and
DIRN(WND) are giving totally incorrect answers (for ECMWF, GFS, and
ETA 104 grids at least). When I run MUL(urel,const) I get the
correct number. This looks like some kind of memory error when both
arguments are the same item.
Here are the commands and results from gdprof, gdpoint results follow:
==================== gdprof results ======================
GEMPAK-GDPROF>li
GPOINT = @8.458;92.63
GDATTIM = f0
GVCORD = hagl
GVECT = WND
GDFILE = /home/disk/data/gempak/model/ecmwf/2005112300_ecmwf.gem
LINE = 3
MARKER = 0
BORDER = 1
PTYPE = lin
SCALE = 0
XAXIS = 0
YAXIS = 0/10
WIND = BM1
REFVEC =
WINPOS = 1
FILTER = YES
TITLE = 1
PANEL = 0
CLEAR = YES
TEXT = 1/21//hw
DEVICE = XW
OUTPUT = T
THTALN = 0
THTELN = 0
MIXRLN = 0
GFUNC = urel
r
Grid function: urel
X,Y grid point: 8.46 92.63
Lat/lon: 47.44 -122.31
Number of levels: 1
Data range: -1.12 -1.12
Scaling factor: 10** 0
051123/0000V000 UREL @8.458;92.63
LATITUDE, LONGITUDE = ( 47.44, -122.31 )
HAGL UREL
10.00 -1.116
HAGL U UREL V VREL
10.00 -1.116 0.769
GEMPAK-GDPROF>gfunc = mul(urel,urel)
GEMPAK-GDPROF>r
GDPROF PARAMETERS
Grid function: mul(urel,urel)
Grid vector function: WND
X,Y grid point: 8.46 92.63
Lat/lon: 47.44 -122.31
Number of levels: 1
Data range: 3.76 3.76 ***** WRONG!!!!
Scaling factor: 10** 0
Wind display: BM1
051123/0000V000 MULRELUREL @8.458;92.63
LATITUDE, LONGITUDE = ( 47.44, -122.31 )
HAGL MULRELUREL
10.00 3.763 ***** WRONG!!!!
HAGL U UREL V VREL
10.00 -1.116 0.769
GEMPAK-GDPROF>gfunc = mul(urel,-1.116)
GEMPAK-GDPROF>r
Grid function: mul(urel,-1.116)
Data range: 1.25 1.25
051123/0000V000 MULREL-1.1 @8.458;92.63
LATITUDE, LONGITUDE = ( 47.44, -122.31 )
HAGL MULREL-1.1
10.00 1.246
HAGL U UREL V VREL
10.00 -1.116 0.769
==================== gdpoint results ======================
GEMPAK-GDPOINT>li
GDATTIM = f0
GDFILE = /home/disk/data/gempak/model/ecmwf/2005112300_ecmwf.gem
GLEVEL = 10
GPOINT = @8.458;92.63
GVCORD = hagl
GFUNC = mul(urel,-1.116)
SCALE = 0
GEMPAK-GDPOINT>gfun = urel
GEMPAK-GDPOINT>r
GDFILE: /home/disk/data/gempak/model/ecmwf/2005112300_ecmw
GPOINT: @8.458;92.63
GVCORD: hagl
GLEVEL: 10
GFUNC : urel
SCALE : 0
051123/0000F000 : -1.11616
GEMPAK-GDPOINT>gfu = mul(urel,urel)
GEMPAK-GDPOINT>r
GDFILE: /home/disk/data/gempak/model/ecmwf/2005112300_ecmw
GPOINT: @8.458;92.63
GVCORD: hagl
GLEVEL: 10
GFUNC : mul(urel,urel)
SCALE : 0
051123/0000F000 : 3.76344 ***** WRONG!!!!
GEMPAK-GDPOINT>gfu = mul(urel,-1.11616)
GEMPAK-GDPOINT>r
GDFILE: /home/disk/data/gempak/model/ecmwf/2005112300_ecmw
GPOINT: @8.458;92.63
GVCORD: hagl
GLEVEL: 10
GFUNC : mul(urel,-1.11616)
SCALE : 0
051123/0000F000 : 1.24581
GEMPAK-GDPOINT>gfun = vrel
GEMPAK-GDPOINT>r
GDFILE: /home/disk/data/gempak/model/ecmwf/2005112300_ecmw
GPOINT: @8.458;92.63
GVCORD: hagl
GLEVEL: 10
GFUNC : vrel
SCALE : 0
051123/0000F000 : 0.76872
GEMPAK-GDPOINT>gfu = mag(wnd)
GEMPAK-GDPOINT>r
GDFILE: /home/disk/data/gempak/model/ecmwf/2005112300_ecmw
GPOINT: @8.458;92.63
GVCORD: hagl
GLEVEL: 10
GFUNC : mag(wnd)
SCALE : 0
051123/0000F000 : 2.10129 ***** WRONG!!!! s/b 1.355
GEMPAK-GDPOINT>gfu = dirn(wnd)
GEMPAK-GDPOINT>r
GFUNC : dirn(wnd)
051123/0000F000 : 159.70622 ***** WRONG!!!! s/b 124.6 degrees
And, lest you think this is confined to the ecmwf file, here's the
same bug with the 1-degree GFS file
GEMPAK-GDPOINT>r
GDFILE: $HDS/gfs/2005112312_gfs.gem
GPOINT: @8.458;92.63
GVCORD: hagl
GLEVEL: 10
GFUNC : urel
SCALE : 0
051123/1200F000 : -0.83057
GEMPAK-GDPOINT>gfu = mul(urel,-0.83057)
GEMPAK-GDPOINT>r
GFUNC : mul(urel,-0.83057)
051123/1200F000 : 0.68985
GEMPAK-GDPOINT>gfu = mul(urel,urel)
GEMPAK-GDPOINT>r
GFUNC : mul(urel,urel)
051123/1200F000 : 0.85965 ***** WRONG!!!! s/b 0.689
and with the eta104 grids:
GEMPAK-GDPOINT>gdfi = $HDS/eta/2005112312_eta104.gem
GEMPAK-GDPOINT>gfu = urel
GEMPAK-GDPOINT>r
GDFILE: $HDS/eta/2005112312_eta104.gem
GPOINT: @8.458;92.63
GVCORD: hagl
GLEVEL: 10
GFUNC : urel
SCALE : 0
051123/1200F000 : -2.27911
GEMPAK-GDPOINT>gfu= mul(urel,-2.27911)
GEMPAK-GDPOINT>r
GFUNC : mul(urel,-2.27911)
051123/1200F000 : 5.19433
Parameters requested: GDATTIM,GDFILE,GLEVEL,GPOINT,GVCORD,GFUNC,SCALE.
GEMPAK-GDPOINT>gfu = mul(urel,urel)
GEMPAK-GDPOINT>r
GFUNC : mul(urel,urel)
051123/1200F000 : 5.28800 ***** WRONG!!!! s/b 5.194
GEMPAK-GDPOINT>gfun = vrel
GEMPAK-GDPOINT>r
GFUNC : vrel
051123/1200F000 : 2.67976
GEMPAK-GDPOINT>gfu = mag(vecr(urel,vrel))
GEMPAK-GDPOINT>r
GFUNC : mag(vecr(urel,vrel))
051123/1200F000 : 3.58182 ***** WRONG!!!! s/b 3.518
======================================================================
Thanks in advance for taking a look at this.
David
--
David Ovens e-mail: address@hidden
Research Meteorologist phone: (206) 685-8108
Dept of Atm. Sciences plan: Real-time MM5 forecasting for the
Box 351640 Pacific Northwest
University of Washington http://www.atmos.washington.edu/mm5rt
Seattle, WA 98195 Weather Graphics and Loops
http://www.atmos.washington.edu/~ovens/loops
