[gradsusr] data not in GRIB format

[Hao He]

Got it. I will check the global attributes.
Thanks a lot!

Hao

On Thu, May 6, 2010 at 2:50 PM, Huddleston, John <
Huddleston at cira.colostate.edu> wrote:

>  Hao
>
>
>
> CMAQ files usually are ioapi or WRF compliant. If they are ioapi, run the
> ‘ncdump –h file.ncf > h’ and look at the global characteristics.  It will
> have everything you need to compose the control file.
>
>
>
> If they are WRF compliant, you will have to go back to the modeler who
> created them.
>
>
>
> Please see http://www.nco.ncep.noaa.gov/pmb/docs/on388/tableb.html#GRID138as an example of the information you need.
>
>
>
> John Huddleston, PhD
>
>
>
> *From:* gradsusr-bounces at gradsusr.org [mailto:
> gradsusr-bounces at gradsusr.org] *On Behalf Of *Hao He
> *Sent:* Thursday, May 06, 2010 12:15 PM
>
> *To:* GrADS Users Forum
> *Subject:* Re: [gradsusr] data not in GRIB format
>
>
>
> John,
>    I start to work on the .ctl file, and I have a question about the xdef
> and ydef. As you plotted, the left corner is not the minimal longitude and
> latitude of the domain. Which value should I use?
>
> Best
>
> Hao
>
> On Wed, May 5, 2010 at 2:16 PM, Huddleston, John <
> Huddleston at cira.colostate.edu> wrote:
>
> Hao, this might be closer if it is 30KM. Change the ytime and year
> accordingly. John
>
>
>
> dset ^YourFile.ncf
> dtype netcdf
> title Vertically integrated atmos chem/aerosol vbles
>
> pdef 94 67 lcc 24.87 -127.10 1 1 33 45 -114.00 30000 30000
> undef -9999
> xdef 94 linear -131.336    0.48
> ydef 67 linear  24.87      0.300
>
>
> zdef 1 linear 1 1
>
> tdef 24  linear 00:00Z20apr2006 1hr
>
>
> vars 8
> NO2=>no2  1 t,z,y,x NO2
> NO=>no  1 t,z,y,x NO
> O=>o  1 t,z,y,x O
> O3=>o3  1 t,z,y,x O3
> NO3=>no3  1 t,z,y,x NO3
> CO=>co  1 t,z,y,x CO
> CXO3=>cxo3  1 t,z,y,x cxo3
> NH3=>nh3  1 t,z,y,x NH3
> endvars
>
>
>    ------------------------------
>
> *From:* gradsusr-bounces at gradsusr.org [gradsusr-bounces at gradsusr.org] On
> Behalf Of Hao He [haohe.umcp at gmail.com]
>
> *Sent:* Wednesday, May 05, 2010 11:59 AM
> *To:* GrADS Users Forum
> *Subject:* Re: [gradsusr] data not in GRIB format
>
> That is great! My grid size is 30 km instead of 36 km, and I think the
> difference is trivial. I will read the format and modified it to my own
> grid.
> Thanks a lot!
>
> Hao
>
> On Wed, May 5, 2010 at 1:52 PM, Huddleston, John <
> Huddleston at cira.colostate.edu> wrote:
>
> Hao
>
>
>
> If it is 36 kilometer CMAQ netCDF you can probably start with this grid
> control definition.
>
>
>
> dset ^YourFile.ncf
> dtype netcdf
> title Vertically integrated atmos chem/aerosol vbles
> pdef 148 112 lcc 16.77 -121.51 1 1 33 45 -97.00 36000 36000
> undef -9999
> xdef 148 linear -139.285    0.57565
> ydef 112 linear  16.77      0.3600
> zdef 1 linear 1 1
> tdef 72  linear 00:00Z20apr2006 1hr
> vars 8
> NO2=>no2  1 t,z,y,x NO2
> NO=>no  1 t,z,y,x NO
> O=>o  1 t,z,y,x O
> O3=>o3  1 t,z,y,x O3
> NO3=>no3  1 t,z,y,x NO3
> CO=>co  1 t,z,y,x CO
> CXO3=>cxo3  1 t,z,y,x cxo3
> NH3=>nh3  1 t,z,y,x NH3
> endvars
>
>
>
> john Huddleston, PhD, PE
>   ------------------------------
>
> *From:* gradsusr-bounces at gradsusr.org [gradsusr-bounces at gradsusr.org] On
> Behalf Of Hao He [haohe.umcp at gmail.com]
>
> *Sent:* Tuesday, May 04, 2010 1:58 PM
> *To:* gradsusr at gradsusr.org
> *Subject:* [gradsusr] data not in GRIB format
>
> Hi,
>    I have a 2D data set with uneven Lon and Lat distribution. I notice that
> the GRIB data for GrADS has even grids, so I am wondering whether it is
> possible to display this data set on GrADS? Thanks for help!
>
> Hao
>
>
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