[ncl-talk] set_dimension_query

[Kunal Bali]

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