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Clint, My interpretation of VCOORD is that it will copy over surface values on the specified coordinates, so if you gave gvcord=pres/thta and vcoord=none;hght, then aside from the theta coordinate grids, you will copy over those grids on level=0 of the specified vcoord. This won't copy over every pressure grid from the original file to my reading. Instead, you would use gdmod as you mentioned. Steve Chiswell Unidata User Support >From: Clint Rowe <address@hidden> >Organization: . >Keywords: 200002212216.PAA04348 >Chiz, > >I thought specifying VCOORD=whatever in GDVINT was supposed to copy grids >from the specified vertical coordinates into the output file along with >the newly interpolated grids. This doesn't seem to be happening. I followed >the examples in the manual and tutorial; here's the results of my attempt: > >levanto% gdvint > GDFILE Grid file ../thtagrids/testeta211.gem > GDOUTF Output grid file ../thtagrids/testeta211.gem > GDATTIM Grid date/time first > GVCORD Grid vertical coordinate pres/thta > GLEVEL Grid level 280-350-5 > MAXGRD Maximum number of grids 3000 > GAREA Graphics area @1;1;93;65 > VCOORD Vertical coordinate type pres;none;sgma;pagl;hagl;eatm > Parameters requested: GDFILE,GDOUTF,GDATTIM,GVCORD,GLEVEL,MAXGRD,GAREA, > VCOORD. > GEMPAK-GDVINT>glev=300 > GEMPAK-GDVINT>gdfile=/data/gempak/hds/2000022112_eta211.gem > GEMPAK-GDVINT>l > GDFILE = /data/gempak/hds/2000022112_eta211.gem > GDOUTF = ../thtagrids/testeta211.gem > GDATTIM = first > GVCORD = pres/thta > GLEVEL = 300 > MAXGRD = 3000 > GAREA = @1;1;93;65 > VCOORD = pres;none;sgma;pagl;hagl;eatm > GEMPAK-GDVINT>r > PRES found. > TMPK found. > HGHT found. > OMEG found. > UREL found. > VREL found. > RELH found. > AVOR found. > look at ip 2 > look at ip 3 > look outlev 300.000 > look at ip 4 > look outlev 300.000 > look at ip 5 > look outlev 300.000 > look at ip 6 > look outlev 300.000 > look at ip 7 > look outlev 300.000 > look at ip 8 > look outlev 300.000 > Interpolation is done. No errors. > Parameters requested: GDFILE,GDOUTF,GDATTIM,GVCORD,GLEVEL,MAXGRD,GAREA, > VCOORD. > GEMPAK-GDVINT>exit > levanto% gdinfo > GDFILE Grid file >/data/gempak/hds/2000022112_eta211.gem > LSTALL Full list flag YES > OUTPUT Output device/filename T > Parameters requested: GDFILE,LSTALL,OUTPUT. > GEMPAK-GDINFO>gdfile=../thtagrids/testeta211.gem > GEMPAK-GDINFO>r > > GRID FILE: ../thtagrids/testeta211.gem > > > GRID NAVIGATION: > PROJECTION: LCC > ANGLES: 25.0 -95.0 25.0 > GRID SIZE: 93 65 > LL CORNER: 12.19 -133.46 > UR CORNER: 57.29 -49.38 > > GRID ANALYSIS BLOCK: > UNKNOWN ANALYSIS TYPE > > Number of grids in file: 16 > > Maximum number of grids in file: 3000 > > NUM TIME1 TIME2 LEVL1 LEVL2 VCORD PARM > 1 000221/1200F000 0 THTA PRES > 2 000221/1200F000 0 THTA TMPK > 3 000221/1200F000 0 THTA HGHT > 4 000221/1200F000 0 THTA OMEG > 5 000221/1200F000 0 THTA UREL > 6 000221/1200F000 0 THTA VREL > 7 000221/1200F000 0 THTA SPFH > 8 000221/1200F000 0 THTA AVOR > 9 000221/1200F000 0 THTA THTA > 10 000221/1200F000 300 THTA PRES > 11 000221/1200F000 300 THTA PSYM > 12 000221/1200F000 300 THTA OMEG > 13 000221/1200F000 300 THTA UREL > 14 000221/1200F000 300 THTA VREL > 15 000221/1200F000 300 THTA SPFH > 16 000221/1200F000 300 THTA AVOR > Parameters requested: GDFILE,LSTALL,OUTPUT. > GEMPAK-GDINFO>exit > levanto% > >Do I have to go the route of GDCFIL to create a file, GDMOD to copy the grids >from the original eta file into a new file with enough room for the thta >surfaces, then run GDVINT? > >Clint > >==================================================================== >Clinton M. Rowe >Associate Professor >Meteorology/Climatology Program phone:(402)472-1946 >Department of Geosciences fax:(402)472-4917 >University of Nebraska-Lincoln address@hidden >