Thanks Ben! I guess where I am with this now is that I have found, as you say, the VGTYP in the operational products (the *sflux* grib files), but I don't find it on any of the 0.5 x 0.5 degree files. Which means, that as you say, I'll have to figure out how to reproject the data from the Gaussian grid to a regular grid with 0.5x0.5 lat lon coordinates.
Any thoughts on that process?? :D Thanks again, john > > John, > > GRIB files are an interesting beast. It has been awhile since I have dealt > with them, but I will try to help you with what I can recall. First, the > data records in the files are indicated by: > > 1. Record number > 2. Position in bytes > 3. Date (YYMMDDHH). > 4. Parameter name (LAND=land/sea mask) > 5. Indicator of parameter and units (grib PDS octet 9) > 6. Type of level/layer (grib PDS octet 10) > > > 7. Height, pressure, etc (grib PDS octets 11-12) > 8. Time Range (grib PDS octet 21) > 9. Period of time 1, (grib PDS octet 19) > 10. Period of time 2, (grib PDS octet 20) > 11. Forecast time unit (grib PDS octet 18) > > > 12. level > 13. anl=analysis, fcst=forecast > 14. NAve (number of grids used to make average) > > The "type of level/layer" I believe is the grid projection type. Anyway, > these things can be mixed and matched, so all we need to do is find your > parameter in the grid projection that you want (or you will have to > re-project the data). > > The operational models appear to have VGTYP, but the reanalysis products do > not appear to have this. Maybe this is causing your confusion? > > This page might be more useful to you: > http://www.cpc.noaa.gov/products/wesley/wgrib.html > > I hope this is useful, > Ben Root > > -- Configuration `````````````````````````` Plone 2.5.3-final, CMF-1.6.4, Zope (Zope 2.9.7-final, python 2.4.4, linux2), Python 2.6 PIL 1.1.6 Mailman 2.1.9 Postfix 2.4.5 Procmail v3.22 2001/09/10 Basemap: 1.0 Matplotlib: 1.0.0 ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
