Re: get values from wrfout file for all lat, lon points

From: Luis Fernando Montana Roa <lfmontanar_at_nyahnyahspammersnyahnyah>
Date: Thu Oct 03 2013 - 16:56:21 MDT

Thanks Mary, the wrfout file is about 24 GB and ASCII data is used as input
to the CPT tool for local analysis.
Is there a more efficient way of doing it?

-- Fernando

On Thu, Oct 3, 2013 at 10:21 AM, Mary Haley <haley@ucar.edu> wrote:

> It looks like you are running into a memory issue. How big are the
> variables you are trying to write to ASCII?
>
> Is there a reason you need to write ASCII files? We usually recommend
> against this, especially if they are very large. This is an inefficient and
> cumbersome way to store data.
>
> If you continue to have problems, then I will need to have access to your
> script and data. Please see:
>
> http://www.ncl.ucar.edu/report_bug.shtml
>
> --Mary
>
> On Oct 3, 2013, at 6:18 AM, Luis Fernando Montana Roa <
> lfmontanar@unal.edu.co> wrote:
>
> > Sorry, I had failed to attach the script. There goes.
> >
> > -- Fernando
> >
> >
> > On Thu, Oct 3, 2013 at 7:16 AM, Luis Fernando Montana Roa <
> lfmontanar@unal.edu.co> wrote:
> > Thanks Mary, I did the settings with your suggestions and tried the
> script attached. But when I run it, get the following error:
> >
> > fatal:NclMalloc Failed:[errno=12]
> > fatal:Exp: Could not allocate memory for result type, can't continue
> >
> > fatal:["Execute.c":8128]:Execute: Error occurred at or near line 25 in
> file w_2.ncl
> >
> > -- Fernando
> >
> >
> > On Wed, Oct 2, 2013 at 2:25 PM, Mary Haley <haley@ucar.edu> wrote:
> > I think you simply need to change the "do" loop that writes out the
> ASCII file so that it writes the whole arrays, rather than one time step at
> a time.
> >
> > For example, instead of:
> >
> > line = new(ntimes+1,string)
> >
> > line(0) = " Time Temperature Pressure
> Relative_Humidity U V Wind_speed"
> >
> > do it = 0,ntimes-1
> >
> > line(it+1) = sprintf("%5.0f",it) +" " \
> > +sprintf("%18.2f", T_C(it)) +" " \
> > +sprintf("%12.2f", P(it)) +" " \
> > +sprintf("%12.2f", RH(it)) +" " \
> > +sprintf("%12.2f", ua) +" " \
> > +sprintf("%12.2f", va) +" " \
> > +sprintf("%12.2f", wind_speed(it))
> >
> > end do
> >
> > You can do this (UNTESTED):
> >
> > filename = "out_2_1.txt"
> > format = "%5.0f %18.2f %12.2f %12.2f %12.2f %12.2f %12.2f"
> > write_table(filename,"w",header,"%s")
> > write_table(filename,"w",[/it, t_C, P, RH, ua, va,
> wind_speed/],format)
> >
> > --Mary
> >
> >
> > On Oct 1, 2013, at 8:35 PM, Luis Fernando Montana Roa <
> lfmontanar@unal.edu.co> wrote:
> >
> > > Thanks Mary, what I need is to write an ascii file with variable
> values for each time step and grid point, as shown below.:
> > >
> > > Time Lat Lon Temp Pres RH U
> V Wind_speed
> > > 0 -10.0 -85.0 20.89 101.05 92.24 1.58 -1.26 2.02
> > > 0 -10.0 -84.5 19.94 101.01 96.16 2.18 -1.6 2.7
> > > ...
> > > 0 -9.5 -85.0 19.94 101.01 96.16 2.18 -1.6 2.7
> > > 0 -9.5 -84.5 19.65 101.04 96.88 2.84 -1.4 3.17
> > > ...
> > > 1 -10.0 -85.0 19.94 101.01 96.16 2.18 -1.6 2.7
> > > 1 -10.0 -84.5 19.65 101.04 96.88 2.84 -1.4 3.17
> > > ...
> > > 1 -9.5 -85.0 19.37 101015.75 97.29 3.09 -0.98
> 3.24
> > > 1 -9.5 -84.5 19.08 101026.23 97.51 3.23 -0.76
> 3.32
> > > ...
> > >
> > > I will appreciate any help in this regard.
> > >
> > > -- Fernando
> > >
> > > ---------- Forwarded message ----------
> > > From: Mary Haley <haley@ucar.edu>
> > > Date: Tue, Oct 1, 2013 at 3:03 PM
> > > Subject: Re: get values from wrfout file for all lat,lon
> points
> > > To: Luis Fernando Montana Roa <lfmontanar@unal.edu.co>
> > > Cc: ncl-talk@ucar.edu
> > >
> > >
> > > Hi Luis,
> > >
> > > I'm not sure exactly sure of your question. You don't need to get
> individual point locations for one lat/lon pair at a time. You can simply
> do the calculation across all lat/lon values.
> > >
> > > For example, instead of this do loop:
> > >
> > > do it = 0,ntimes-1
> > >
> > > time = it
> > > Latitude = 4.16
> > > Longitude = -74.87
> > >
> > > res = True
> > > res@returnInt = True
> > > point = wrf_user_ll_to_ij(in,Longitude,Latitude,res)
> > >
> > > x = point(0)
> > > y = point(1)
> > >
> > > U = wrf_user_getvar(in, "U", time)
> > > ua_in = wrf_user_unstagger(U,U@stagger)
> > > ua = ua_in(0:0,x,y)
> > > V = wrf_user_getvar(in, "V", time)
> > > va_in = wrf_user_unstagger(V,V@stagger)
> > > va = va_in(0:0,x,y)
> > > wind_speed(it) = sqrt(ua^2+va^2)
> > > copy_VarCoords(ua,wind_speed(it))
> > > wind_speed@Units= "m/s"
> > >
> > > T_in = wrf_user_getvar(in, "T2", time)
> > > T_k = T_in(x,y)
> > > T_C(it) = T_k-273.15
> > > T_C@Units="C"
> > >
> > > P_in = wrf_user_getvar(in, "PSFC", time)
> > > P(it) = P_in(x,y)
> > > P_rh=P_in(x,y)
> > >
> > > Q_in = wrf_user_getvar(in, "Q2", time)
> > > Q(it) = Q_in(x,y)
> > > Q_rh=Q_in(x,y)
> > >
> > > RH(it) = wrf_rh(Q_rh, P_rh, T_k)
> > >
> > > end do
> > >
> > > I think you can just do this, using the special value of -1 for time:
> > >
> > > time = -1
> > > U = wrf_user_getvar(in, "U", time) ; This will get U
> across all times, lats, and lons
> > > ua = wrf_user_unstagger(U,U@stagger)
> > > V = wrf_user_getvar(in, "V", time)
> > > va = wrf_user_unstagger(V,V@stagger)
> > > wind_speed( = sqrt(ua^2+va^2)
> > > copy_VarCoords(ua,wind_speed)
> > > wind_speed@Units= "m/s"
> > >
> > > T = wrf_user_getvar(in, "T2", time)
> > > T_C = T-273.15
> > > T_C@Units="C"
> > >
> > > Q_rh = wrf_user_getvar(in, "Q2", time)
> > > P_rh = wrf_user_getvar(in, "PSFC", time)
> > > RH = wrf_rh(Q_rh, P_rh, T_k)
> > >
> > >
> > >
> > >
> > > On Sep 30, 2013, at 4:47 PM, Luis Fernando Montana Roa <
> lfmontanar@unal.edu.co> wrote:
> > >
> > > > Hi, I have this script to write the values of some variables to a
> single point. How do I adjust it for all points (lat, lon) available in the
> file?
> > > > Thanks,
> > > >
> > > > --
> > > > Fernando
> > > > <w_v_x.ncl>_______________________________________________
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> > >
> > >
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> >
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Received on Thu Oct 3 16:56:36 2013

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