[ncl-talk] set_dimension_query

[Adam Phillips]

Hi Kunal,
Yes, clicking on the output netCDF link from the Applications page:
http://www.ncl.ucar.edu/Applications/o-netcdf.shtml
I would recommend following the inefficient method #1. Unless you are
writing a file with many large variables, the inefficient method works just
fine.
http://www.ncl.ucar.edu/Applications/method_1.shtml
Good luck,
Adam

On Wed, Sep 13, 2017 at 10:25 AM, Kunal Bali <kunal.bali9 at gmail.com> wrote:

> Thank you so much, it worked
>
> I want to know one more thing.
> After rearranging the dimensions can we now convert (or write) this
> arranged file into netcdf format?
>
>
>
> Kunal Bali
>
>
>
>
>
>
> On Wed, Sep 13, 2017 at 8:55 PM, Adam Phillips <asphilli at ucar.edu> wrote:
>
>> Hi Kunal,
>> I think you just need to rearrange the order of your lines and tweak a
>> couple of lines. As the error message states, lat is not defined in your
>> 3rd line and you are referring to it as if it is.Try this:
>> a = addfile("/media/Local Disk/NPL/MODIS_FPC/MAIACTAOT.h
>> 00v02.20000570505.hdf","r")
>> var  = a->Optical_Depth_055(:,:)
>> nlat = 1200
>> nlon = 1200
>> lat = latGlobeFo(nlat, "lat", "latitude", "degrees_north")
>> lon = lonGlobeFo(nlon, "lon", "longitude", "degrees_east")
>> lat = lat(::-1)
>> lon = (/ lon - 180. /)  ; subtract 180 from all values
>> lon&lon = lon           ; update coordinates
>>
>> var!0 = "lat"    ; you can name these dimensions whatever you want..
>> var!1 = "lon"
>> var&lat = lat     ; but make sure you refer to the correct named
>> dimensions
>> var&lat = lon
>> ;var&XDim_grid1km = lat
>> ;var&YDim_grid1km = lon
>>
>> If you have any further questions please respond to the ncl-talk email
>> list.
>> Adam
>>
>>
>>
>> On Wed, Sep 13, 2017 at 8:38 AM, Kunal Bali <kunal.bali9 at gmail.com>
>> wrote:
>>
>>> Dear NCL
>>>
>>> I have a file with the variable summary. The dimensions are in 2D.
>>>
>>> ncl 2>  printVarSummary(var)
>>>
>>> Variable: var
>>> Type: short
>>> Total Size: 2880000 bytes
>>>             1440000 values
>>> Number of Dimensions: 2
>>> Dimensions and sizes:    [*YDim_grid1km | 1200] x [XDim_grid1km | 1200]*
>>> Coordinates:
>>> Number Of Attributes: 7
>>>   long_name :    AOT at 0.55 micron
>>>   scale_factor :    0.001
>>>   add_offset :       0
>>>   unit :    None
>>>   _FillValue :    -28672
>>>   valid_range :    ( -100, 5000 )
>>>   hdf_name :    Optical_Depth_055
>>>
>>>
>>> I am trying to read the dimensions of this file as
>>>
>>> begin
>>> ;---Read data
>>>          a = addfile("/media/Local Disk/NPL/MODIS_FPC/MAIACTAOT.h
>>> 00v02.20000570505.hdf","r")
>>>
>>>             var  = a->Optical_Depth_055(:,:)
>>>
>>>          var&XDim_grid1km = lat
>>>          var&YDim_grid1km = lon
>>>
>>>         nlat = 1200
>>>          nlon = 1200
>>>             lat = latGlobeFo(nlat, "lat", "latitude", "degrees_north")
>>>         lon = lonGlobeFo(nlon, "lon", "longitude", "degrees_east")
>>>             lat = lat(::-1)
>>>             lon = (/ lon - 180. /)  ; subtract 180 from all values
>>>             lon&lon = lon           ; update coordinates
>>>
>>>
>>>         var!0 = "lat"
>>>         var!1 = "lon"
>>>
>>>
>>> But the error appeared as
>>> *fatal:Variable (lat) is undefined*
>>>
>>>
>>> So, could anyone please let me know that how to read dimension of this
>>> file.
>>>
>>> Thank You
>>>
>>>
>>> Regards
>>> Kunal Bali
>>>
>>>
>>>
>>>
>>>
>>>
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>>>
>>
>>
>> --
>> Adam Phillips
>> Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
>> www.cgd.ucar.edu/staff/asphilli/   303-497-1726 <(303)%20497-1726>
>>
>> <http://www.cgd.ucar.edu/staff/asphilli>
>>
>
>
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-- 
Adam Phillips
Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
www.cgd.ucar.edu/staff/asphilli/   303-497-1726

<http://www.cgd.ucar.edu/staff/asphilli>
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