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19990824: converting ncep reanalysis grids
- Subject: 19990824: converting ncep reanalysis grids
- Date: Fri, 27 Aug 1999 10:17:53 -0600
Choi,
The data set you have is NCAR/NCEP reanalysis grids in NetCDF
format.
To convert these grids into Gempak format, I have provided
a program called dcreanal in the Gempak distribution.
You will first need to make sure you have the program installed
in your Gempak installation. To build this program- make sure your
Gempak installation account has sourced the Gemenviron environmental
variables, then:
cd $NAWIPS/unidata/ldmbridge/dcreanal
make clean
make all
make install
make clean
The above commands will install the dcreanal program into the $GEMEXE
directory.
To use the program to convert your 4 times daily surface pressure
grids into Gempak gridded data file, use the program as follows:
dcreanal netcdffile.nc gempakfile_YYYYMM.gem
The netcdffile.nc file will be your netcdf input file.
The gempakfile_YYYYMM.gem will be Gempak files, using the YYYYMM
template to create separate monthly files for the output (since Gempak
can only have 200 times in a single file, using the template replacement
will create a new file for each month).
Once you have converted the data into Gempak format, you can use any of
the Gempak gridded data programs to display the data.
Steve Chiswell
>From: "Jong-Nam Choi" <address@hidden>
>Organization: .
>Keywords: 199908250259.UAA09744
>Dear. Mr. Steve Chiswell.
>
>This is Jong-Nam Choi.
>Thank you for your help.
>I installed NetCDF, then I tried to run ncdump.c.
>I included ncdump.h. I ran, but I guess I can't handle it now.
>I need a bit more time to figure out.
>Here I got a message, after I run.
> id:fatal:symbol referencing errors. No output written to a.out.
>
>Actually I downloaded netCDF files from Climatic Data Center (cdc)
> ftp.cdc.noaa.gov in /Datasets/ncep.reanalysis.dailyavgs
>
>I hope you can give me precious tips.
>Thank you in advance for your help.
>
>Choi
>
>Jong-Nam Choi
>Ph.D. Candidate
>Climatology Research Laboratory
>Dept. of Geography, University of Georgia.
>Athens, GA, 30602
>(Phone) 706-542-6060
>
>From address@hidden Fri Aug 27 08:53:18 1999
>Received: from gilda.unidata.ucar.edu (gilda.unidata.ucar.edu [128.117.140.30]
> )
> by unidata.ucar.edu (8.8.8/8.8.8) with SMTP id IAA25338
> for <address@hidden>; Fri, 27 Aug 1999 08:53:18 -0600 (MDT)
>Message-Id: <address@hidden>
>Organization: .
>Keywords: 199908271453.IAA25338
>To: Unidata Support <address@hidden>
>Subject: Re: 19990827: About data conversion (cont.)
>In-reply-to: Your message of "Fri, 27 Aug 1999 08:21:56 MDT."
> <address@hidden>
>Date: Fri, 27 Aug 1999 08:53:18 -0600
>From: Steve Emmerson <address@hidden>
>
>Dear Support,
>
>>Date: Fri, 27 Aug 1999 08:21:56 -0600
>>From: Unidata Support <address@hidden>
>>Organization: .
>>To: address@hidden
>>Subject: 19990827: About data conversion (cont.)
>>Keywords: 199908271421.IAA24385
>
>In the above message, you wrote:
>
>>
>> ------- Forwarded Message
>>
>> >From: Jong-Nam Choi <address@hidden>
>> >Subject: About data conversion.
>> >Organization: University of Georgia
>> >Keywords: 199908270352.VAA13001 netCDF ncdump
>>
>> Dear. Mr. Steve Chiswell
>>
>> This is Jong-Nam Choi who asked conversion program.
>> Here is the ncdump output.
>>
>> Thank you in advance for your help.
>>
>> Jong-Nam Choi
>>
>>
>>
>> netcdf pres_sfc_1980 {
>> dimensions:
>> lon = 144 ;
>> lat = 73 ;
>> time = UNLIMITED ; // (366 currently)
>> variables:
>> float lat(lat) ;
>> lat:units = "degrees_north" ;
>> lat:actual_range = 90.f, -90.f ;
>> lat:long_name = "Latitude" ;
>> float lon(lon) ;
>> lon:units = "degrees_east" ;
>> lon:long_name = "Longitude" ;
>> lon:actual_range = 0.f, 357.5f ;
>> double time(time) ;
>> time:units = "hours since 1-1-1 00:00:0.0" ;
>> time:long_name = "Time" ;
>> time:actual_range = 17347584., 17356344. ;
>> time:delta_t = "0000-00-01 00:00:00" ;
>> time:avg_period = "0000-00-01 00:00:00" ;
>> short pres(time, lat, lon) ;
>> pres:long_name = "mean Daily Pressure at surface" ;
>> pres:valid_range = 40000.f, 115000.f ;
>> pres:actual_range = 49370.f, 109260.f ;
>> pres:units = "Pascals" ;
>> pres:add_offset = 367650.f ;
>> pres:scale_factor = 10.f ;
>> pres:missing_value = 32766s ;
>> pres:precision = -1s ;
>> pres:least_significant_digit = -1s ;
>> pres:GRIB_id = 1s ;
>> pres:GRIB_name = "PRES" ;
>> pres:var_desc = "Pressure\n",
>> "CC" ;
>> pres:dataset = "NCEP Reanalysis Daily Averages\n",
>> "AJ" ;
>> pres:level_desc = "Surface\n",
>> "0" ;
>> pres:statistic = "Mean\n",
>> "M" ;
>> pres:parent_stat = "Individual Obs\n",
>> "I" ;
>>
>> // global attributes:
>> :Conventions = "COARDS" ;
>> :title = "mean daily NMC reanalysis (1980)" ;
>> :base_date = 1980s, 1s, 1s ;
>> :history = "created 95/03/13 by Hoop (netCDF2.3)" ;
>> :description = "Data is from NMC initialized reanalysis\n",
>> "(4x/day). It consists of most variables interpolated to\n",
>> "pressure surfaces from model (sigma) surfaces." ;
>> :platform = "Model" ;
>> }
>>
>>
>> ------- End of Forwarded Message
>
>So what am I supposed to do with this?
>
>--------
>Steve Emmerson <http://www.unidata.ucar.edu>
>
>From address@hidden Fri Aug 27 20:55:30 1999
Dear. Mr. Steve Chiswell.
I really appreciate your help. You blew all my problems away. Thanks
again.
Jong-Nam Choi.
Jong-Nam Choi
Ph.D. Candidate
Climatology Research Laboratory
Dept. of Geography, University of Georgia.
Athens, GA, 30602
(Phone) 706-542-6060