[gradsusr] wrf output data in lambert projection plot problem

[Jeffrey Duda]

You're seeing that because the model grid itself has certain projection.  It
has nothing to do with how Grads is interpreting the data.  This is a WRF
thing.  It doesn't look like a Lambert Conformal Conic projection, however,
because I think if you do "set mproj lambert", your data should appear to be
a rectangle with parallel edges and the map behind it should be altered.
Your second figure does not show that, so perhaps you have some other
projection.  I am also a WRF user, but I use the ARWpost program to convert
WRF netCDF files to something Grads can read.  Since I don't use the
wrf2grads program, there could be something with that program that caused
the PDEF line in your control file to be something other than it is in the
model.

Jeff Duda

On Tue, Feb 8, 2011 at 10:41 AM, Fu Kai <sdfukai at gmail.com> wrote:

> Dear GrADS Users,
>
> I am beginner to wrf and GrADS, and want to display the output data of wrf
> using GrADS, I used the wrf2grads program to get the ctl and dat file which
> are needed by GrADS. When I tried to plot the data, there seems to be a
> problem, the figure does not coincide with the lat and lon lines (Fig 1). I
> thought it was because the case uses a lambert projection, while the default
> projection used by GrADS seems to be Mercator, so I tried to use "set mproj
> lambert" in GrADS, but only get a small figure (Fig 2) which also seems not
> properly. Which command should I use to get a right figure.
>
> Any suggestion would be greatly appreciated.  The CTL file and the figure
> plotted are below.  I'm a new GrADS user, so if this is a newbie problem, I
> apologize in advance.
>
> CTL file created by wrf2grads program:
>
> dset ^wrfout_d01_2000-01-24_12:00:00.dat
> undef 1.e35
> pdef  73  60 lcc  28.171  -93.649    1.000    1.000  60.  30.  -98.000
> 30000.  30000.
> xdef  219 linear  -94.6   0.13513513
> ydef  160 linear   23.6   0.13513513
> zdef   27 levels
>     0.02849
>     0.09096
>     0.17899
>     0.29167
>     0.43435
>     0.61657
>     0.83989
>     1.17945
>     1.62939
>     2.10596
>     2.60960
>     3.34814
>     4.30997
>     5.27340
>     6.23490
>     7.19647
>     8.16307
>     9.13477
>    10.11029
>    11.10285
>    12.13382
>    13.21484
>    14.34895
>    15.53801
>    16.78960
>    18.11523
>    19.52641
> tdef         5 linear 12z24jan2000  1mn
> vars    8
> U               27 0 U Compoment of wind
> V               27 0 V Component of wind
> W               27 0 W Component of wind
> THETA           27 0 Theta
> TC              27 0 Temperature in C
> P               27 0 Pressure (HPa)
> Z               27 0 Height (m)
> HGT             0  0 Terrain Height
> endvars
>
> Fig. 1.
> [image: wrfout_d01_2000-01-24_12_00_00.png]
>
> Fig. 2.
> [image: wrfout_d01_2000-01-24_12_00_00lambert.png]
>
> Thanks in advance.
>
> Kai Fu
>
>
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>


-- 
Jeff Duda
Iowa State University
Meteorology Graduate Student
3134 Agronomy Hall
www.meteor.iastate.edu/~jdduda
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