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[GEMPAK #RUX-727661]: Ability of GEMPAK to dump/list data files in ASCII format
- Subject: [GEMPAK #RUX-727661]: Ability of GEMPAK to dump/list data files in ASCII format
- Date: Tue, 10 Jul 2007 10:02:00 -0600
Massoud,
GDLIST will output all data values of a parameter at a grid point.
As GDINFO shows, there are 2 different CAPE grids in the broadcast.
One based on surface conditions (eg GDVCORD=NONE, GLEVEL=0),
and the other based on the boundary layer (0 to 180mb above the ground,
GVCORD=PDLY, GLEVEL=180:0), eg:
GDFILE = nam80
LSTALL = yes
OUTPUT = t
GDATTIM = all
GLEVEL = all
GVCORD = all
GFUNC = cape
GEMPAK-GDINFO>r
GRID FILE: /data/ldm/gempak/model/nam/2007071012_nam211.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: 1847
Maximum number of grids in file: 5000
NUM TIME1 TIME2 LEVL1 LEVL2 VCORD PARM
5 070710/1200F000 180 0 PDLY CAPE
160 070710/1200F000 0 NONE CAPE
171 070710/1200F006 180 0 PDLY CAPE
325 070710/1200F006 0 NONE CAPE
340 070710/1200F012 180 0 PDLY CAPE
493 070710/1200F012 0 NONE CAPE
509 070710/1200F018 180 0 PDLY CAPE
659 070710/1200F018 0 NONE CAPE
675 070710/1200F024 180 0 PDLY CAPE
825 070710/1200F024 0 NONE CAPE
843 070710/1200F030 180 0 PDLY CAPE
996 070710/1200F030 0 NONE CAPE
1011 070710/1200F036 180 0 PDLY CAPE
1164 070710/1200F036 0 NONE CAPE
1180 070710/1200F042 180 0 PDLY CAPE
1332 070710/1200F042 0 NONE CAPE
1347 070710/1200F048 180 0 PDLY CAPE
1500 070710/1200F048 0 NONE CAPE
1517 070710/1200F054 180 0 PDLY CAPE
1672 070710/1200F054 0 NONE CAPE
1685 070710/1200F060 180 0 PDLY CAPE
1840 070710/1200F060 0 NONE CAPE
Parameters requested: GDFILE,LSTALL,OUTPUT,GDATTIM,GLEVEL,GVCORD,GFUNC.
GEMPAK-GDINFO>
Sample output from GDLIST would look like:
GDATTIM = f000
GLEVEL = 0
GVCORD = none
GFUNC = cape
GDFILE = nam80
GAREA = dset
PROJ = def
SCALE = 0
OUTPUT = t
GEMPAK-GDLIST>r
Creating process: gn for queue 28155
GDLIST PARAMETERS:
Grid file: nam80
GRID IDENTIFIER:
TIME1 TIME2 LEVL1 LEVL2 VCORD PARM
070710/1200F000 0 NONE CAPE
GAREA: dset
SCALE FACTOR : 10** 0
OUTPUT: TERM/
MINIMUM AND MAXIMUM VALUES 0.00 4860.00
Enter <cr> to accept parameters or type EXIT:
Grid file: nam80
GRID IDENTIFIER:
TIME1 TIME2 LEVL1 LEVL2 VCORD PARM
070710/1200F000 0 NONE CAPE
AREA: dset GRID SIZE: 93 65
COLUMNS: 1 93 ROWS: 1 65
Scale factor: 10** 0
COLUMN: 1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24
25 26 27 28 29 30 31 32
33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48
49 50 51 52 53 54 55 56
57 58 59 60 61 62 63 64
65 66 67 68 69 70 71 72
73 74 75 76 77 78 79 80
81 82 83 84 85 86 87 88
89 90 91 92 93
ROW 65 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
20.00 60.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 80.00 120.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 20.00 20.00 0.00 0.00 20.00
0.00 0.00 0.00 0.00 0.00 20.00 0.00 0.00
0.00 0.00 0.00 0.00 0.00 0.00 20.00 20.00
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 20.00 40.00 40.00
(etc).
It is up to you to determine the ROW/COLUMN locations of the points for your
matlab display.
Alternatively, in GDCSV, similar input can be used, and output looks like:
93, 65, 57.2895, -49.3846, 40.00000
where the "comma separated values" (ie the name CSV) are column, row,
lat, lon, and the value of the GFUNC.
The tutorial explains the concepts of a vertical coordinate, a level,
and grid navigation. These should be familiar concepts for looking
at the gridded data.
Steve Chiswell
Unidata User Support
> Hi Steve,
>
> Thanks for getting back with me again. You brought up a
> good point in your email this afternoon regarding about
> GDLIST or GDCSV. It turns out that I'm not particularly
> interested in outputting an entire model run, but rather
> to output a grid of a desired product of my choosing. If
> possible, I would like to use either program and convert
> the 12-hr precip analysis, LI, and CAPE, from NAM 211
> and/or GFS 211 to ASCII text. I have already displayed
> these data products on GEMPAK for analysis and what I hope
> to accomplish as part my research is to convert these
> products to ASCII, examine their text file, and display
> them again except this time on MATLAB. Therefore, will
> GDLIST or GDCSV help me accomplish this task or will I
> have to resort to a grib decoder (i.e., wgrib) instead?
>
> If GDLIST or GDCSV were to work, I'm still not sure what
> appropriate parameters will be needed for GFUNC, GAREA,
> PROJ, SCALE, and etc. I have looked through the tutorial
> today, but I may need some guidance for these particular
> products. Any suggestions?
>
> Thanks so much for your time.
>
> Massoud Fazal
> UARC Systems Teaching Institute
> NASA Ames Research Center
> Moffett Field, CA 94035
> (650)-604-0225
>
>
Ticket Details
===================
Ticket ID: RUX-727661
Department: Support GEMPAK
Priority: High
Status: Closed
