NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Hi Nick, The image you attached shows holes for mixing ratio and theta-e, which makes me guess it may have to do with the pressure dependency: from: http://www.unidata.ucar.edu/cgi-bin/gempak/manual/apxB_index MIXR Mixing ratio MIXR ( DWPC, PRES ) = PR_MIXR ( DWPC, PRES ) THTE Equivalent potential temperature in Kelvin THTE (PRES, TMPC, DWPC) = PR_THTE (PRES, TMPC, DWPC) Relative humidity would not be dependent on PRES, which is why you see a full field. RELH Relative humidity RELH ( TEMP, DWPT ) = PR_RELH ( TEMP, DWPT ) Not sure I can provide an exact answer as to why these missing areas area present, but it's likely a result of how the grid was created and the quality/distribution of observations used to initialize the model (i.e. GEMPAK is performing as intended and is displaying what is available). Without the grid file you're using for this case I can't say more, but would suggest you try a few different plots for theta-e, mixing ratio and pressure to see if you can view these "holes" in GDCNTR or GDPLOT3. (I'm especially interested in a cross-section plot of PRES contours layered on top of MIXR and THTE). If you see the holes then that would hint at missing data in the grid. If you don't see the holes in plan view or cross-section plots, then that hints the problem is isolated to GDCROSS. Michael James Unidata > I am having problems plotting theta-e and mixing ratio using gdcross > using archived GFS data. There are data holes that show up just for > those two variables. Relative humidity seems to work as well as > others, but those two parameters have gaps in the data. Have you seen > this before? And is this due to the way GEMPAK calculates mixing ratio > and theta-e. I have attached an example of what I am talking about. > > Thanks > Nick Nauslar > > > > > > > > > > On Sep 7, 2010, at 5:27 PM, Unidata GEMPAK Support wrote: > > > Hi Nick, > > > > in $GEMTBL/colors/ there is a white background version called > > "coltbl.xwp_white" - simply copy this to coltbl.xwp (make a backup > > of coltbl.xwp first) and you should be set. > > > > Michael > > Unidata > > > > > >> Is there a place I can retrieve the coltbl.xwp color table so I can > >> have white backgrounds on my images? > >> > >> Thanks > >> Nick > >> > >> > > > > > > Ticket Details > > =================== > > Ticket ID: AZQ-203645 > > Department: Support GEMPAK > > Priority: Normal > > Status: Open > > > > > Ticket Details =================== Ticket ID: AZQ-203645 Department: Support GEMPAK Priority: Normal Status: Open