NOAA / NWS's Meteorological Development Laboratory
Degrib (NDFD GRIB2 Decoder) 
|
NOAA / NWS's Meteorological Development Laboratory
| |
|
|
Degrib (NDFD GRIB2 Decoder) |
 |
NDFD Home | Verification | News | Organization |  |
|
Subject: Degrib 1.30
Date: Mon, 20 Oct 2003 14:12:30 -0400 From: Arthur Taylor To: arthur.taylor@noaa.gov Hi You all have the unique distinction of being registered on my degrib (aka NDFD_GRIB2Decoder) mailing list (all 207 of us) (I'd like to welcome: craigb, jjd1571, jloomis, sdw, jlittle, s_umesh, Jim, dave, Mark Moede, dmurray, bberoukhim, rscoatesjr, driskellb, Seth Sarakaitis, dpsumption, Zedong Zhang, Peter Staples, James Scarlett, Mike Coyne, sean, CWaite57, Janjaap Brinkman, Valerie Mills, thealy, Matthew Deitemeyer, William Brooks, weatherspier, g.mccarroll, sabatzli, msplitt, GRiley, info, s.rey, Richard Townsend, Scott Handel, jbrodie, WeatherAVD, luoma, alvaroqx, Betsy Gardner, Clive Reece, Javier Martinez) Please let me know (email me) if you want to unregister. The latest version of the program is on: www.nws.noaa.gov/mdl/NDFD_GRIB2Decoder/ ----------- General News. 1) As some of you may know, the "powers that be" decided to keep the NDFD Grids "experimental" as of Oct 1, 2003 (which is why I took my time about getting out version 1.30). They plan to: A) "Continue to issue at least some NDFD grids experimentally past Sep 30." and B) "Experimental grids will be transitioned to 'official' over the next 6-12 months once determined ready per the criteria now being reviewed by the MSDs." 2) NWS focus articles: A) 9/15/2003: http://weather.gov/com/nwsfocus/fs091503.htm The "NDFD Technical Workshop Presentations are Available Online". (go to: " http://www.nws.noaa.gov/ndfd/techwkshp_pres.htm") B) 9/22/2003: http://weather.gov/com/nwsfocus/fs092203.htm The editor of NWS focus was interested in any NDFD Customers... Well, since you all use it, any of you want to share what you do with it? If so, email NWS.Focus@noaa.gov. I'm also curious, so if you feel comfortable, could you CC me? C) 10/6/2003: http://weather.gov/com/nwsfocus/fs100603.htm: In the section under "NWS Begins IFPS Era; ..." They mention that the public comment period on NDFD will be extended through "Dec. 1, 2003". Just thought I would remind you. ----------- News about this release: I have just finished putting together version "1.30" (last one that I announced was "1.27" on 9/9/2003). This release is mainly focused on: 1) The Big Polygon, 2) Doing coverage grids using Nearest point Interpolation, 3) "-P -cells all" option, 4) Being able to handle operational / experimental URLs. 1) The Big Polygon: I had been generating shape files that were either point or polygon. The polygons were "small" in that they were the size of a grid cell. Several people have asked if I could merge polygons that have the same value, together to create big polygons. This would create smaller shape files making them easier to work with (particularly in ArcExplorer), while preserving the information. The small polygons will still be useful for merging shape files together, but for simple viewing, the big polygons are much faster. I'm not sure which is preferable from the ArcIMS perspective. (option is "-C -Shp -poly big" versus "-C -Shp -poly small") 2) Some people have commented that they like the coverage grid option (-Interp), but found that for discrete variables (weather), they couldn't use it because it always performed "bi-linear" interpolation, which resulted in "in-between" values. I have now introduced "-Interp near" and "-Interp bilinear". As I said, the "near" option should work regardless of the type of variable, while the "bilinear" option is limited to continuous variables. 3) Some people have asked for a ways to map grid cells to lat/lon so they can just read the .flt files, and not have to concern themselves with map projections or ESRI file formats. I have now implemented a "-P -cells all" option, which should probe all the cells in the GRIB2 file in a similar way to "-P -pnt <lat>,<lon> -pntStyle 1" method, except at all the cells. For locations it outputs: <cell x>,<cell y>,<lat>,<lon>. 4) Variables are now considered "Experimental", "Operational", and "Not Available" (instead of "Available" or "Not Available"). In the ndfd.ini configuration file, there are now two URL location variables (OperDir and ExprDir) and two FTP location variables (OperDir and ExprDir). If looks for "Operational" variables in the OperDir locations, and "Experimental" variables in the ExprDir locations. That should allow it to handle the eventual "Operational" status of NDFD variables. 5) James Scott has kindly provided a makefile that works in Mac OS X. The program now works on : MS-Windows, HP, Linux, IBM-Aix, Mac OS X, and someone had it working on a Sun. Anyone try it on a palm pilot yet? :-) ----------- As always, I tested this release on my PC (XP), 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). For those with access to MDL's GDP or NHDW machines, see: /home/taylor/ (./degrib/bin/degrib.lin for linux or ./degrib/bin/degrib.hp for Hp's) Please let me know if you have problems. Regards, Arthur
|
||||||||||||||||||||||||||||||||||||||||||||||||||||
