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>From: "Hoeth, Brian" <Brian.Hoeth@xxxxxxxxxxxxxx> >Organization: JSFC >Keywords: 200202211951.g1LJpex01567 gribtonc Brian, >No, we're wanting to convert GRIB files to netcdf for display in McIDAS. We >have been using GRIB decoder software that will create McIDAS GRID files, >but our decoders don't work on some of the larger GRIB files that NCEP is >pushing out now. I have been putting together a new gribdec.tar.Z packaging and an addendum for Unidata McIDAS that supports the larger grids that are floating around out there (up to 400000 points). The new gribdec.k routine that I am using will decode all of the CONDUIT grids (grids that one could FTP from the NIC) except the ensembles. The other thing I added to the my bundling of gribdec.tar.Z is a routine that will decode grib messages directly into to images (AREA files). This is a fusion of gribdec.pgm and grdimg.pgm. It works nicely for everything I have used it for in the 4 days since I put it together. >So, we were looking into possibly grabbing your GRIB to netcdf converter >instead of having to alter our decoders (no sense re-inventing the wheel). I would be happy to let you use my new gribdec.tar.Z package. The good thing about them is they are almost 100% code from XCD (which I believe you have; true?). >Once in netcdf format, the data should be able to be displayed via ADDE in >McIDAS right? Yes, but you will still be faced with the maximum size of grids that McIDAS can handle. This is why I will be upgrading gridparm.inc in my next McIDAS addendum (along with the XCD header file grib.h). In addition, I have modified the XCD routine btab.c to do a better job of creating navigation from grib messages with grid type 255. The next thing I have been thinking of doing is adding a true Lambert Conformal nav module (nvxlcc.dlm) to McIDAS and upgrading grddef.for to support that navigation. - Aside - the Lambert Conformal nav modules in McIDAS support Lambert Conformal Secant (nvxlamb.dlm) and Lambert Conformal Tangent (nvxtanc.dlm), but only for grids where the measure in the X and Y dimensions is equal. This has caused me quite a bit of pain recently, so I figure I will just bite the bullet and add a general, correct Lambert Conformal nav. What do you think? Tom
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