This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.
Patrick, The depth of the layers that the SOIM values are given is in centimeters as I listed below using the vertical coordinate 112 in $GEMTBL/grid/vcrdgrib1.tbl. The parameter description in $GEMTBL/grid/ncepgrib2.tbl from the grib 388 manual provides for: !ID# NAME UNITS GNAM 144 Volumetric soil moisture content fraction SOIM The values of SOIM are being scaled by 100 (the *10**2) as you show below. They are units=fraction, eg the values would actually be between .08 and .96, so your color bar is showing scaled times 100 for values more easily described as between 8% and 96%. Steve Chiswell >From: "Patrick O'Reilly" <address@hidden> >Organization: UCAR/Unidata >Keywords: 200212132240.gBDMeF409403 >Thanks Steve. I understand that the SLTK will be in degrees K, but do you >know offhand what units the SOIM is plotted by default? In a quick plot I >made, the units range from 8-96 per the colorbar, and the default title says >'10:40 M SOIM (*10**2). This appears to be in meters instead of cm? Or >does it just SAY meters but it's really cm? My glevel=10:40. Is this >correct? I think the units are kg/m**2, but need a little convincing. Any >light you can shine would be appreciated. Thanks again! > >Patrick > >----- Original Message ----- >From: "Unidata Support" <address@hidden> >To: "Patrick O'Reilly" <address@hidden> >Cc: "Unidata Support" <address@hidden> >Sent: Tuesday, December 10, 2002 5:43 PM >Subject: 20021210: GEMPAK: Soil Temperature/Moisture > > >> >> Patrick, >> >> GEMTBL/grid/ tables show for ncep models: >> SOIM parameter 144 Volumetric soil moisture content. >> SLTK parameter 85 Ssoil temperature. >> >> In the NOAAPORT (HRS) grids, NGM grids 202, 207 and 211 carry SLTK at DPTH >0. >> ETA 212 carries soil temp and moisture at levels 0-10cm, 10-40cm, >> 40-100cm, 100-200cm. >> >> CONDUIT feed Models that carry SOIM and SLTK include: >> ETA grids 212 and 104, RUC grid 236 and 252, AVN grid 3 and >> MRF grids 2 and 3. >> >> When looking for parameters in certain models, you can use gdinfo with >> GFUNC set to the specific variables, like GFUNC=SLTK;SOIM and >> GLEVEL, GDATTIM, and GVCORD set to all. >> >> Steve Chiswell >> Unidata User Support >> >> >From: "Patrick O'Reilly" <address@hidden> >> >Organization: UCAR/Unidata >> >Keywords: 200212102310.gBANAK425407 >> >> >Hello in Boulder, >> > >> >I have browsed the help archives and found a couple tidbits about soil >data, >> >but not enough and none too recent. I am looking to create some plots of >> >soil temp and moisture and was wondering if this type of product is even >> >available over the IDD. If so, where is it located? I haven't found any >> >soil parameters in GEMPAK, is what I am looking to do even possible using >> >only IDD data and GEMPAK? Any hints, large or small, would be >appreciated. >> >Thanks! >> > >> >Patrick >> >_______________________________________ >> >Patrick O'Reilly >> >Meteorological Decision Support Scientist >> >The STORM Project - University of Northern Iowa >> >address@hidden ~ ph: 319-273-3789 >> > >> >> >**************************************************************************** >< >> Unidata User Support UCAR Unidata >> (303)497-8643 P.O. Box >> address@hidden Boulder, CO >> -------------------------------------------------------------------------- >> Unidata WWW Service http://www.unidata.ucar.edu/ >< >> >**************************************************************************** >< >