Tom,<br>I've plotted many a Stage IV data. Here's the information in the control files I use:<br><br>dtype grib 255<br>pdef 1121 881 nps 400.439557156973 1600.32924536929 -105.000000 4.763<br>xdef 4201 linear 0 0.0856938824089502<br>
ydef 781 linear 23.1587717210188 0.0856938824089502<br><br>I produced these control files using a script called <a href="http://grib2ctl.pl">grib2ctl.pl</a>. It's freely available, and you can find it <a href="http://www.cpc.ncep.noaa.gov/products/wesley/grib2ctl.html">here</a>.<br>
<br>Jeff Duda<br><br><div class="gmail_quote">On Wed, Oct 10, 2012 at 12:21 PM, Thomas W. Collow <span dir="ltr"><<a href="mailto:tcollow@eden.rutgers.edu" target="_blank">tcollow@eden.rutgers.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,<br>
<br>
Does anyone have any experience plotting NCEP stage 4 precipitation data in GrADS. My problem lies in generating the correct information in the contol file, particularly the xdef and ydef parameters because I can't figure out what the proper grid spacing should be. This is what I have so far using wgrib.<br>
<br>
dset ^ST4.%y4%m2%d2%h2.01h<br>
index ^stage4.idx<br>
options yrev template<br>
undef 9.999E+20<br>
title NCEP Stage IV Precipitation (hourly)<br>
<br>
dtype grib 240<br>
<br>
pdef 1121 881 nps 400.5 1600.5 255 4.763<br>
<br>
xdef 1121 linear -119.023 0.04763<br>
ydef 881 linear 23.117 0.04763<br>
<br>
TDEF 25 linear 00Z10may2010 1hr<br>
ZDEF 1 levels 0<br>
<br>
VARS 1<br>
APCP 0 61,1,0 Accumulated Precipitation (kg/m^2)<br>
ENDVARS<br>
<br>
This gets me all undefined values in GrADS. Does anyone have any experience with this? Thanks in advance<br>
<br>
Tom<br>
_______________________________________________<br>
gradsusr mailing list<br>
<a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a><br>
<a href="http://gradsusr.org/mailman/listinfo/gradsusr" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br>
</blockquote></div><br><br clear="all"><br>-- <br>Jeff Duda<br>Graduate research assistant<br>University of Oklahoma School of Meteorology<br>Center for Analysis and Prediction of Storms<br><br>