NOAA / NWS's Meteorological Development Laboratory
Degrib (NDFD GRIB2 Decoder) 
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NOAA / NWS's Meteorological Development Laboratory
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Degrib (NDFD GRIB2 Decoder) |
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Subject: Degrib version 1.13
Date: Wed, 14 May 2003 13:55:53 -0400 From: "Arthur.Taylor" Organization: DOC/NOAA/NWS - National Weather Service To: Arthur Taylor Sorry about this... I know 1.12 came out on Monday, but I was informed today by Ira Graffman and Heather from ESRI that my polygons are inside out. So, without further ado here is 1.13.. ------------ Hi You all have the unique distinction of being registered on my degrib (aka NDFD_GRIB2Decoder) mailing list (all 56 of us) (I'd like to welcome: karin.larsson, ferrell, and Doug Wilson) Please let me know (email me) if you want to unregister. ----------- I just wanted to let you all know that I have just finished putting together version "1.13" (last one that I announced was "1.12" on 5/12/2003). The newest version of the program is on: www.nws.noaa.gov/mdl/NDFD_GRIB2Decoder/ New to release 1.13: 1) Hopefully fixed the polygon option for the last time... I was creating polygons that were going counter-clockwise around the cell, instead of the way ESRI specified, which is clockwise. Using the union option in ArcView, one can combine all the polygons of a particular value together, thus reducing the size, speeding the draws and making it useable in ArcIMS. The trick is that the union option needed clockwise polygons. Attempting to union the NDFD grid with counter-clockwise polygons takes 30 to 60 minutes, and the results are humorous at best, useless at worst. Using clockwise polygons it took a max of 3-4 minutes, and had much better results. 2) Improved the "IsGrib2" function for the GUI. It had been looking at every byte in a file before determining if a file was or was not a GRIB (1 or 2) file. This was slow (particularly if you had large files in that directory). It now only looks at the first 300 bytes. If it doesn't find "GRIB" in those 300 bytes it states that it is not a GRIB file, which is used for the choice of icon in the GUI display. The GUI does allow one to treat a file, that it had determined was not a GRIB file, as a GRIB file, just in case the first GRIB message was further in than 300 bytes. 3) Created an icon for GRIB1 files which is different than the one for GRIB2 files. 4) Tweaked the GUI some to handle GRIB files with 1000+ messages (see MOS GRIB 1) 5) Minor bug fix in FindSectLen that doesn't really affect anything. ----------- As always, I tested this release on my PC (win 2000), a Linux machine, a HP-Unix machine, and an AIX-Unix (machine). Although I may have missed something in my testing, it should at least compile, and run for some of the test cases. For those of you with access to the NWS NCEP machine, my current version is in: /nfsuser/g06/we25at/degrib (on snow/frost, I'm no longer using asp/bsp). For those with access to MDL's GDP or NHDW machines, see: ~taylor/degrib/ Please let me know if you have problems. ----------- Regards, (and again, I apologize for the frequency of these emails). Arthur
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