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20040707: Decoding Eta Grids
- Subject: 20040707: Decoding Eta Grids
- Date: Thu, 08 Jul 2004 08:30:24 -0600
>From: address@hidden (Jennie L. Moody)
>Organization: UVa
>Keywords: 200407071959.i67JxGaW011411 McIDAS ETA 212 grids
Jennie,
Did Chiz's reply give you enough to get going?
From: Steve Chiswell <address@hidden>
Date: 07 Jul 2004 14:21:55 MDT
To: "Jennie L. Moody" <address@hidden>
Subject: 20040707: Decoding Eta Grids
Jennie,
These ETA212 FTP files are the same as those being distributed via the
CONDUIT feedtype for the IDD. We can set you up with a feed. The ETA 212
grids on the FTP server are a superset of what are delivered on NOAAPORT
and distributed under the HRS feed on IDD (there are many more
levels/parameters/forecast times in the CONDUIT and FTP files).
I routinely decode these here for GEMPAK and running the Workstation ETA
model. Tom would be the person to consult with regarding XCD and all the
parameters/levels for McIDAS, or acessing via ADDE.
Steve Chiswell
Unidata User Support
Tom
>I am working with some guys at NASA running some code
>they wrote. The code goes out and grabs Eta forecasts
>from and NWS server:
>ftp://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/MT.eta_CY.12/RD.20040707/PT.grid_
> DF.gr1/
>
>and grabs files like:
>fh.0000_tl.press_gr.awip3d
>fh.0003_tl.press_gr.awip3d
> etc. through
>fh.0048_t1.press_gr.awip3d
>
>It then runs a decoder, wgrib, for a designated set of parameters
>and levels. I have appended the decoder perl script here.
>The problem I am having is that I often have a problem
>with retrieving the grids via ftp (I guess it just times
>out my connection).
>
>The reason I am writing to Unidata, is that it seems silly to
>me that I should even retrieve data this way, since I am
>currently running the ldm on another machine and decoding
>data. Presently, I run the McIDAS-XCD decoders and decode
>various grids. What I am wondering is if there is a way
>to use the ldm to decode these awip3d files that I am
>currently trying to ftp...they should be the 40km Eta 212 grid.
>
>Are these in fact the same grids that are being sent out
>via the IDD?
>
>Thanks for any light you can shed on this for me. I am trying to
>run some forecast trajectories using these decoded grid files and
>I might have more luck getting the forecasts out if I use the
>idd data that I am getting anyway.
>
>Jennie
>
>
>--------------------code appended here-------
>
>[fcast@nike fcast]$ more
>/home/fcast/Traject_LaRC/Decode/Forecast/convert_eta40km.pl
>#!/usr/bin/perl
>use Time::Local;
>
>### Directory paths ####################################
>$dir_current="/home/fcast/Traject_LaRC/";
>$dir_idl="/usr/local/rsi/idl/bin/";
>########################################################
>
>$dirx=$dir_current."Decode/Forecast/";
>$indir_orig_prefix=$dir_current."Data/ETA/Forecast/Original/";
>$indir_binary_prefix=$dir_current."Data/ETA/Forecast/Binary_40km/";
>
>$intz="12Z";
># Define $fxdayr
># Default is current day
>
>my
>($current_sec,$current_min,$current_hr,$current_day,$current_month,$current_ye
> ar,$current_wday,$current_yday,$current_isdst)=loca
>ltime(time);
>$current_month=$current_month+1;
>$current_year=$current_year+1900;
>$current_yday=$current_yday+1;
>if(length($current_yday)==1){$current_yday="00".$current_yday;}
>if(length($current_yday)==2){$current_yday="0".$current_yday;}
>if(length($current_day)==1){$current_day="0".$current_day;}
>if(length($current_month)==1){$current_month="0".$current_month;}
>
>$year=$current_year;
>$month=$current_month;
>$day=$current_day;
>$yday=$current_yday;
>
>###########################################################################
>
>print "Today is: $current_year$current_month$current_day \n";
>#print "Input Date in yyyymmdd \n";
>#my $input_caldate=<stdin>;
>#chomp($input_caldate);
>#$year=substr($input_caldate,0,4);
>#$month=substr($input_caldate,4,2);
>#$day=substr($input_caldate,6,2);
>
>$time_epoch=timelocal(0,0,0,$day,($month-1),($year-1900));
>my($sec,$min,$hr,$day_tmp,$month_tmp,$year_tmp,$wday,$yday,$isdst)=
> localtime($time_epoch);
>$yday=$yday+1;
>if(length($yday)==1){$yday="00".$yday;}
>if(length($yday)==2){$yday="0".$yday;}
>
>###########################################################################
>
>$fxday=$year.$month.$day;
>#$fxday="20040426";
>
>$indir_orig=$indir_orig_prefix.$fxday."/";
>$indir_binary=$indir_binary_prefix.$fxday."/";
>$fl_latlon="latlon.g212";
>
>opendir(OD,$indir_binary) || mkdir("$indir_binary");
>closedir(OD);
>
>#$infl="fh.0000_tl.press_gr.awip3d";
>$ugrd="UGRD";
>$vgrd="VGRD";
>$vvel="VVEL";
>$temp="TMP";
>$rh="RH";
>$psfc=":PRES:sfc:";
>
>@level=(1000,975,950,925,900,875,850,825,800,775,750,725,700,675,650,625,600,5
> 75,550,525,500,475,450,425,400,375,350,325,300,275,250
>,225,200,175,150,125,100,75,50);
>#@level=(1000.,975.,950.,925.,900.,875.,850.,825.,800.,750.,700.,650.,600.,550
> .,500.,400.,300.,250.,200.,150.,100.,50.);
>
>#$uwinds=":UGRD:850 mb:";
>#$vwinds=":VGRD:850 mb:";
>#$wwinds=":VVEL:850 mb:";
>
>$search="\^fh.00.._tl.press_gr.awip3d\$";
>
>opendir(OD,$indir_orig) || die("Cannot open the directory");
>@fl_orig_all=readdir(OD);
>closedir(OD);
>@fl_orig=();
>foreach(@fl_orig_all)
> {
> if($_ =~ m/$search/)
{
> push(@fl_orig,$_);
> }
> }
>foreach(@fl_orig) {print "$_\n";}
>
>$wgrib=$dirx."wgrib";
>foreach(@fl_orig)
>{
> print "$_\n";
> $infl=$_;
> $hr_fx=substr($infl,5,2);
> if($hr_fx != 0){$hr_fx3before=$hr_fx-3;}
> if($hr_fx < 10){$hr_fx=substr($hr_fx,1,1);}
> if($hr_fx == 0)
> {$hr_fx3before="0";
> $hr_fx="0";}
> $apcp=":APCP:sfc:".$hr_fx3before."-".$hr_fx."hr";
> unlink $_;
> $outfl_bin=$infl.".bin";
> $pid=open(WGRIB_bin,"|$wgrib -s $indir_orig$infl \| grep
>\"$psfc\" \|$wgrib -i -append $indir_orig$infl -o
>$indir_binary$outfl_bin"
>);
> print WGRIB_bin;
> close(WGRIB_bin);
> $pid=open(WGRIB_bin,"|$wgrib -s $indir_orig$infl \| grep
>\"$apcp\" \|$wgrib -i -append $indir_orig$infl -o
>$indir_binary$outfl_bin"
>);
> print WGRIB_bin;
> close(WGRIB_bin);
>
> for($i=0;$i<=$#level;$i++)
> {
> print "LEVEL = $level[$i]\n";
> $uwinds=":$ugrd:$level[$i] mb:";
> $vwinds=":$vgrd:$level[$i] mb:";
> $wwinds=":$vvel:$level[$i] mb:";
> $temp3d=":$temp:$level[$i] mb:";
> $rh3d=":$rh:$level[$i] mb:";
> $pid=open(WGRIB_bin,"|$wgrib -s $indir_orig$infl \| grep
>\"$uwinds\" \|$wgrib -i -append $indir_orig$infl -o
>$indir_binary$outfl_
>bin");
> # print WGRIB_bin;
> close(WGRIB_bin);
> $pid=open(WGRIB_bin,"|$wgrib -s $indir_orig$infl \| grep
>\"$vwinds\" \|$wgrib -i -append $indir_orig$infl -o
>$indir_binary$outfl_
>bin");
> # print WGRIB_bin;
> close(WGRIB_bin);
> $pid=open(WGRIB_bin,"|$wgrib -s $indir_orig$infl \| grep
>\"$wwinds\" \|$wgrib -i -append $indir_orig$infl -o
>$indir_binary$outfl_
>bin");
> # print WGRIB_bin;
> close(WGRIB_bin);
> $pid=open(WGRIB_bin,"|$wgrib -s $indir_orig$infl \| grep
>\"$temp3d\" \|$wgrib -i -append $indir_orig$infl -o
>$indir_binary$outfl_
>bin");
> # print WGRIB_bin;
> close(WGRIB_bin);
> $pid=open(WGRIB_bin,"|$wgrib -s $indir_orig$infl \| grep
>\"$rh3d\" \|$wgrib -i -append $indir_orig$infl -o
>$indir_binary$outfl_bi
>n");
> # print WGRIB_bin;
> close(WGRIB_bin);
> }
>}
>
>foreach(@fl_orig)
> {
> $ENV{"INDIR"}=$indir_binary;
> $ENV{"INFL"}=$_.".bin";
> $ENV{"DIRX"}=$dirx;
> $ENV{"FL_LATLON"}=$fl_latlon;
> $ENV{"DATE"}=$fxday;
> $ENV{"INTZ"}=$intz;
> chdir("$dirx");
> $idl="|".$dir_idl."idl -quiet";
> $pid=open(IDL, "$idl") or die "Couldn't fork: $!\n";
> print IDL ".run convert_eta_40km_pl.pro";
> close(IDL)
> }
>
>---------------------------end of perl script
>-----------------------
>
>
>--
>
>*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*
>
> Jennie Lynne Moody, Ph.D.
> Research Associate Professor
>
>Department of Environmental Sciences Ph: (434) 924-0592
>University of Virginia
>244 Clark Hall address@hidden
>291 McCormick Rd. FAX:(434) 982-2300
>P.O. Box 400123
>Charlottesville, VA 22904-4123
>
> UVA Weather Page--> http://windfall.evsc.virginia.edu/~mcuser
>
>*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*~*
>
>
>
>
>
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