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20010207: grib stage iv precip

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  • Subject: 20010207: grib stage iv precip
  • Date: Wed, 7 Feb 2001 15:32:07 -0700
David,

Grid block filling isn't a feature of the grid programs, but I did use this
method in my gprcm program which plots the 10km RCM data from the SDUS4x files.
http://www.unidata.ucar.edu/packages/gempak/examples/gprcm/

Otherwise, If you had a true raster, you could paste a GINI header on the data
and treat it as an image.

Steve Chiswell
Unidata User Support



On Wed, 7 Feb 2001 address@hidden wrote:

> Bob,
> 
> FYI...I figured it out.  The missing flag had to be changed from -0.01 to
> -9999.00 in the "wmogrib1.tbl" and "wmogrib2.tbl" files.  Now I get good
> looking output that contains both zero and missing data.  Thanks for your
> help.
> 
> On a related note.  Is there a way to plot data in gempak grid files as a
> raster (i.e., don't contour the data and then color fill it, but just color
> fill each grid cell based on its value)?   I played around with gdmap,
> gdplot, and gdplot2 but couldn't figure it out.
> 
> David
> 
> Bob Rozumalski wrote:
> 
> > David,
> >
> > I don't recall how I treated the missing vs no precip problem.
> > I would contact Brett McDonald at HPC and ask how he handles
> > the Stage 4 data. Brett has been working with these datasets
> > longer than I have.
> >
> > Bob
> >
> > #
> > #Bob,
> > #
> > #This may not be your area of expertise, but you mentioned that you've
> > #worked with the 4 km stage iv precip data so I thought I'd see if you can
> > #answer my gempak question.  After I degrib the precip data into a gempak
> > #file (using nagrib), I find that grid points without measurable
> > #precipitation always assigned the value -0.01.  Thus, I can't distinguish
> > #between missing data and no precipitation.  Any thoughts or comments on
> > #what's happening here?  It seems like this must be an nagrib problem.
> > #Have you encountered this problem or heard of a solution?  Thanks.
> > #
> > #David
> > #
> 
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