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> Dr. Chiswell, > > I have a question of gd2img. The satellite observations that I'm using to > compare with my model-simulated satellite are all in celsius. I have both > celsius and kelvin versions of cloud top temperatures in my gempak files > before they're converted to gini with gd2img. Can I also use gd2img to > convert the celsius cloud top temperatures? Yes, you can use any variable for GFUNC as long as you create a nex2gini.tbl entry such as: CTMPC 15 2 K,255,176,-110,-31;175,0,-31.5,15 TICZ99 TMPK The band number of n=15 is what is used in imgtyp.tbl column 6 as 2**n-1 (so that would be 2**14), where I had previously sent you 2**15 for band=16 (or you can just redefine CTMPK to CTMPC using the same band number). Steve Chiswell Unidata User Support > I attempted to put a table entry for a celsius variable (CTMPC) in > nex2gini.tbl, by subtracting 273 off all the values for the kelvin cloud > top temps. Is that correct? I'm also not sure what values to put into > imgtyp.tbl for CTMPC. > Thanks! > Megan > > > Megan, > > > > I put together a completely standalone tarfile (attached to this message) > > that should run without any upgrade of your previous versions. > > > > First thing is to see if your Redhat can run the binary I built here under > > fedora core 5. > > > > Unpack the tarfile (it will create its own "ncsu" subdirectory where you > > unpack it. > > In the directory are the nex2gini.tbl file that defines the mapping from > > temperature to pixel value: > > CTMPK 16 2 K,255,176,163,242;175,0,242.5,330 TICZ99 TMPK > > > > The 2 part IR mapping is pixel values 255 -> 176 convert to 163K -> 242K, > > 175 -> 0 convert to 242.5K -> 330K > > These match the standard IR curve used for10.7 micron imagery in > > $GEMPAK/source/gemlib/im/imbtot.f > > and GEMPAK/source/gemlib/im/imttob.f. > > > > The CTMPK in this entry must match the name of your grid function! Band > > used will be "16" which is used in the $GEMTBL/imgtyp.tbl entry I sent > > you previously as 2**(band-1) (aka 2**15). > > > > You will be able to run the program within the ncsu directory since all > > tables are searched > > in the current working directory. Otherwise, the nex2gini.tbl would be > > found in > > $GEMTBL/unidata/nex2gini.tbl, the gd2img.pdf would be found in > > $GEMPDF/gd2img.pdf. > > > > The program can be run as: > >> gd2img > > GDATTIM Grid date/time f024 > > GDFILE Grid file satir_f24.gem > > GLEVEL level 0 > > GVCORD Vertical coordinate none > > GFUNC Gridded parameter CTMPK > > SCALE Output scaling 0 > > PROJ Map projection/angles/margins|dr > > GRDAREA Area covered by grid > > KXKY Number of grid points in x;y > > CPYFIL Grid file whose navigation is to satir_f24.gem > > SATFIL output file name testimg.gini > > > > Since your grid is a 4x4km LCC grid, I used that in cpyfil for > > the output image projection. Otherwise, a GRDAREA, PROJ, and KXKY could > > be specified but it has to be a lambert tangent cone with dx=dy, but > > you probably don't want to have to figure that out unless you change the > > model resoltion! > > > > The GFUNC name CTMPK must match the entry in nex2gini.tbl > > > > Go ahead and give this a try. As I mentioned, its under development so it > > spits out some debug information > > and the help file is basically non-existant, but improving 100% all the > > time ;-) > > > > Let me know if you can get the program to run, and I'll keep working on > > cleaning up > > the interface and input. Of course, you will eventually want to run a > > production version in an > > up to date GEMPAK release in the future. > > > > Steve Chiswell > > Unidata User Support > > > > > > > > > >> Dr. Chiswell, > >> We are running Red Hat Enterprise Linux, 4 or 5. I am currently using > >> gempak v5.6. If that's too old, I think 5.8.3 is also compiled on the > >> cluster I'm using, so I could use it instead. > >> Thanks again for your help, > >> Megan > >> > >> >> Mr. Chiswell, > >> >> I took a look at that test image you sent, and that's exactly what I > >> >> wanted. > >> >> I'd like to generate a lot more of these images from my model output. > >> I > >> >> was wondering if you could send me the code you used. Could I > >> install > >> >> gd2img by itself or would I need a whole new gempak version? > >> >> Thanks, > >> >> Megan > >> > > >> > Megan, > >> > > >> > I have the gd2img directory in the source distribution of 5.10.1, but > >> > didn't > >> > configure it to be built in the binary distributions since it is still > >> > under development. > >> > I have been testing it out to create topo images from dem data, but > >> > created the > >> > TMPK to pixel value entry in the table for your data. I will make it > >> part > >> > of the standard > >> > build for 5.10.2; I just need to add some user friendliness to the > >> > program. > >> > > >> > I can send you the program to run without upgrading your distribution > >> if > >> > you can tell me what OS etc you are running. Do you know what version > >> of > >> > GEMPAK you are > >> > currently running? > >> > > >> > Dr. Steve Chiswell > >> > NC State 87, 90, 94 > >> > Unidata User Support > >> > > >> > > >> > > >> >> > >> >> > >> >> > Megan, > >> >> > > >> >> > I created the attached GINI format satellite image from your data. > >> >> > To display the image, you will need to add the following line to > >> your > >> >> > $GEMTBL/sat/imgtyp.tbl file (or imgtyp.tbl file in your working > >> >> > directory): > >> >> > > >> >> > CTMPK IR_TMPK 0 255 11 2**15 1 > >> >> > ir_upc3.tbl > >> >> > > >> >> > Note use only spaces in that file, not tabs. > >> >> > > >> >> > The conversion process is somewhat manual for this process since I > >> >> have to > >> >> > generate a > >> >> > mapping of pixel values to gridded data values. This is something I > >> >> need > >> >> > to add for > >> >> > users in a working program, but doing this with your data helps me > >> get > >> >> to > >> >> > that > >> >> > point - I did discuss this type of project with Gary Lackmann here > >> >> last > >> >> > summer, > >> >> > so its a work in progress. > >> >> > > >> >> > I need to find out from you if this mapping of brightness > >> temperature > >> >> to > >> >> > pixel > >> >> > is what you are looking for (its the standard 2 part temperature > >> curve > >> >> > used for > >> >> > IR satellites), and if not, I'll need to get this worked out to > >> >> provide > >> >> > you with the > >> >> > program. > >> >> > > >> >> > I displayed this with your grid points and contours in gdplot2 and > >> the > >> >> > image lines up > >> >> > with the points, so my first pass seems to be in the right > >> direction. > >> >> > > >> >> > Let me know how this works for you..... > >> >> > > >> >> > Steve Chiswell > >> >> > Unidata User Support > >> >> > > >> >> > > >> >> >> Here's the grid navigation from gdinfo... > >> >> >> GDFILE Grid file satir_f24.gem > >> >> >> LSTALL Full list flag YES > >> >> >> OUTPUT Output device/filename T > >> >> >> GDATTIM Grid date/time last > >> >> >> GLEVEL Grid level 0 > >> >> >> GVCORD Grid vertical coordinate none > >> >> >> GFUNC Scalar grid CTMPK > >> >> >> Parameters requested: > >> >> GDFILE,LSTALL,OUTPUT,GDATTIM,GLEVEL,GVCORD,GFUNC. > >> >> >> GEMPAK-GDINFO>r > >> >> >> > >> >> >> GRID FILE: satir_f24.gem > >> >> >> > >> >> >> GRID NAVIGATION: > >> >> >> PROJECTION: LCC > >> >> >> ANGLES: 27.0 -85.3 27.0 > >> >> >> GRID SIZE: 159 159 > >> >> >> LL CORNER: 15.83 -82.64 > >> >> >> UR CORNER: 21.20 -76.45 > >> >> >> > >> >> >> GRID ANALYSIS BLOCK: > >> >> >> ANALYSIS TYPE: BARNES > >> >> >> DELTAN: 0.073 > >> >> >> DELTAX: -9999.000 > >> >> >> DELTAY: -9999.000 > >> >> >> GRID AREA: 15.00 -84.00 22.00 -75.00 > >> >> >> EXTEND AREA: 15.00 -84.00 23.00 -75.00 > >> >> >> DATA AREA: 15.00 -84.00 23.00 -75.00 > >> >> >> > >> >> >> Also, the file (satir_f24.gem) is posted at.. > >> >> >> http://tempest.meas.ncsu.edu/megan > >> >> >> if you'd like to have the actual file. > >> >> >> > >> >> >> Basically, I'm working on generating a model-simulated satellite > >> IR > >> >> >> product, kind of like model-simulated radar. But I'd like to use > >> the > >> >> >> satellite color tables to make an observational comparison. I'd > >> >> >> eventually like to try and use the model-simulated IR on grids of > >> >> >> different navigation, but I started out with this grid because > >> it's > >> >> 4-km > >> >> >> grid spacing, similar to satellite resolution. > >> >> >> > >> >> >> Thanks for your help! If there's any other information you'd like, > >> >> just > >> >> >> let me know. > >> >> >> > >> >> >> Megan > >> >> >> > >> >> >> > >> >> >> > Megan, > >> >> >> > I have been working on a gd2img program in the source > >> distribution > >> >> >> which > >> >> >> > can convert a grid to an image using a specified satellite id > >> and > >> >> >> > channel number with a projection remapped into one that the > >> image > >> >> >> format > >> >> >> > can handle. > >> >> >> > > >> >> >> > Can you send me some information about what grid > >> >> projection/navigation > >> >> >> > you have so I can see if this will be sufficient for your > >> >> application? > >> >> >> > The GINI format is somewhat limited specifying a projection and > >> >> pixel > >> >> >> > shape, so might have to use an AREA format instead. Please send > >> >> this > >> >> >> to > >> >> >> > address@hidden. > >> >> >> > > >> >> >> > Steve Chiswell > >> >> >> > Unidata User Support > >> >> >> > > >> >> >> > On Fri, 2007-03-30 at 10:25 -0400, Megan Gentry wrote: > >> >> >> >> I have a GEMPAK grid file that I'd like to convert to image > >> format > >> >> >> and > >> >> >> >> view using the satellite IR color tables. I was wondering what > >> >> the > >> >> >> best > >> >> >> >> way is to convert a grid file to an image file that can be > >> viewed > >> >> >> using > >> >> >> >> the IR color tables? > >> >> >> >> Thanks, > >> >> >> >> Megan > >> >> >> >> > >> >> >> >> ---------------------------------------------------- > >> >> >> >> Megan S. Gentry > >> >> >> >> Graduate Research Assistant, Forecasting Lab > >> >> >> >> Department of Marine, Earth and Atmospheric Sciences > >> >> >> >> North Carolina State University > >> >> >> >> > >> >> >> >> =============================================================================== > >> >> >> >> To unsubscribe gembud, visit: > >> >> >> >> http://www.unidata.ucar.edu/mailing-list-delete-form.html > >> >> >> >> =============================================================================== > >> >> >> > -- > >> >> >> > Steve Chiswell <address@hidden> > >> >> >> > Unidata > >> >> >> > > >> >> >> > >> >> >> > >> >> >> ---------------------------------------------------- > >> >> >> Megan S. Gentry > >> >> >> Graduate Research Assistant, Forecasting Lab > >> >> >> Department of Marine, Earth and Atmospheric Sciences > >> >> >> North Carolina State University > >> >> >> > >> >> >> > >> >> > > >> >> > > >> >> > Ticket Details > >> >> > =================== > >> >> > Ticket ID: FWQ-357482 > >> >> > Department: Support > >> >> > Priority: Normal > >> >> > Status: Closed > >> >> > >> >> > >> >> ---------------------------------------------------- > >> >> Megan S. Gentry > >> >> Graduate Research Assistant, Forecasting Lab > >> >> Department of Marine, Earth and Atmospheric Sciences > >> >> North Carolina State University > >> >> > >> >> > >> > > >> > > >> > Ticket Details > >> > =================== > >> > Ticket ID: FWQ-357482 > >> > Department: Support GEMPAK > >> > Priority: Normal > >> > Status: Closed > >> > > >> > > >> > >> > >> ---------------------------------------------------- > >> Megan S. Gentry > >> Graduate Research Assistant, Forecasting Lab > >> Department of Marine, Earth and Atmospheric Sciences > >> North Carolina State University > >> > >> > > > > > > Ticket Details > > =================== > > Ticket ID: FWQ-357482 > > Department: Support GEMPAK > > Priority: Normal > > Status: Closed > > > ---------------------------------------------------- > Megan S. Gentry > Graduate Research Assistant, Forecasting Lab > Department of Marine, Earth and Atmospheric Sciences > North Carolina State University > > Ticket Details =================== Ticket ID: FWQ-357482 Department: Support GEMPAK Priority: Normal Status: Closed