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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 1.12
Date: Mon, 12 May 2003 20:57:16 -0400 From: "Arthur.Taylor" Organization: DOC/NOAA/NWS - National Weather Service To: Arthur Taylor Hi You all have the unique distinction of being registered on my degrib (aka NDFD_GRIB2Decoder) mailing list (all 53 of us) (I'd like to welcome: crm, Michael Dutter, arnold and jj31571) (for those of you keeping track, I know last time I said there were 52 of us, but 3 of the emails bounced). I'd also like to send Mike Dutter a special Hello (as he used to work with me here at MDL). 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 "1.12" (last one that I announced was "1.1" on 5/2/2003). The newest version of the program is on: www.nws.noaa.gov/mdl/NDFD_GRIB2Decoder/ New to release 1.12: 1) Fixed the poly .shp option a little. Not sure, but I think I was indexing the .shp files incorrectly in version 1.1. Much more confident with the current version. 2) .dbf file can now handle the default missing value from GRIB1. Originally the .dbf file held the data in a 10.3 ascii field (that is 10 digits with 3 decimals). The default GRIB1 missing value is 9.999 * 10 ^ 21, which can't fit in the 10 digit field. The .dbf file now expands (or contracts) according to what data is being stored in it. 3) Cleaned up the .ave script (which is an ArcView Avenue script used to get the correct map projection when working with ESRI Spatial Analyst), so that it is more user friendly. 4) Can now handle polar stereographic, lat/lon and mercator grids, (although I only have sample data for the polar stereographic case). This item currently doesn't matter for NDFD as they only use Lambert Conformal (which I already handled), but it is useful if you want to take MDL's MOS GRIB1 files (polar stereographic) located at (http://weather.noaa.gov/pub/SL.us008001/DF.gr1/DC.mos/) and convert them to .shp file. 5) Created a -nMissing option, which allows one to NOT store the missing values in the .shp files. This is EXTREMELY advantageous, because a completely populated NDFD grid of maxt has about 373,000 missing values (out of 739,000 points) (roughly %50.5 missing). If one does not include the missing values, the .shp / .shx / .dbf files are 1/2 the size, and ESRI can draw the data TWICE as fast. This does not help the .flt option, but ESRI handles that fast enough as is. 6) Improved the GUI to have access to some of the functions that could only be accessed from the command line before. 7) Added a -Decimal option. Originally the data was being truncated to 3 decimals (in the .dbf files)... Now the default is rounding to 3 decimals, but one can choose anywhere from 0 decimals to 17. (More decimals than that and a double (real * 8) can't discern it). Note for the .flt file we are using floats or (real * 4) so 7 decimals is the limit. 8) Got it to compile on the New IBM mainframe systems. Turns out that Tcl/Tk was compiled using 32 bits there, so even though I was instructed to use 64 bits objects when compiling, it wouldn't link. Switching all the code to 32 bit objects does work. I will be looking into the issues related to compiling in a 64 bit environment later. ----------- 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 suitland 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, Arthur
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