[gradsusr] opening modis hdf files

[Sergey Varlamov]

Dear Sagar,

Please try with modified variable description line as:

vars 3
Deep_Blue_Aerosol_Optical_Depth_550_Land_Mean=>deep_blue_aeros 0 y,x optional description
endvars



Sergey

Sagar P Parajuli wrote:
> Hi Sergey,
> thank you very much for your help. I tried to include the vars definitions
> for only one variable but I still get the following error:
> 'SDF file does not have any non-coordinate variables'.
>
> my complete script is:
> dset ^./MYD08_D3.A2003121.005.2007081003101.hdf
> xdef XDim:mod08 360 linear -180.0 1.0
> ydef YDim:mod08 180 linear -90.0 1.0
> vars 1
> var 1 Deep_Blue_Aerosol_Optical_Depth_550_Land_Mean=>deep_blue_aeros 0 y,x
> endvars
>
>
> What could be the issue ? Will you please advise what other definitions
> should be included in var 1 line?
>
>
>
> Sagar
>
> On Mon, Nov 19, 2012 at 12:07 AM, Sergey Varlamov <vsm at jamstec.go.jp> wrote:
>
>   
>> Dear Sagar P Parajuli,
>>
>> It is normal grads behavior: GrADS cuts names of variables to 15 symbols.
>> To overcome it, you have to add also the variables description section to
>> your description file and assign short "GrADS names" that you like
>> to original long names in the HDF file, like:
>>
>> dset ^./MYD08_D3.A2003121.005.2007081003101.hdf
>> xdef XDim:mod08 360 linear -180.0 1.0
>> ydef YDim:mod08 180 linear -90.0 1.0
>> vars 3
>> Deep_Blue_Aerosol_Optical_Depth_550_Land_Mean=>od_550 0 y,x Optical
>> depth at 0.55 microns for land (corrected): Mean
>> Deep_Blue_Aerosol_Optical_Depth_550_Land_Standard_Deviation=>od_550_sd 0
>> y,x Optical depth at 0.55 microns for land (corrected): Standard Deviation
>> Deep_Blue_Aerosol_Optical_Depth_550_Land_Minimum=>od_550_min 0 y,x
>> Optical depth at 0.55 microns for land (corrected): Minimum
>> endvars
>>
>> Inside must be just "vars" lines, 3 in the example above.
>> If you have other - please add description lines and modify
>> vars number.
>> See the Grads documentation for details and modify example above,
>> especially if you receive again some strange images.
>> Description of variables has to consistent with the hdf structure:
>> number of vertical levels if any (0 above),  grid layout etc.
>>
>> Hope it could help you.
>>
>> Sergey Varlamov
>>
>>
>> Sagar P Parajuli wrote:
>>     
>>> Hi,
>>> I was able to open modis hdf file (MYD08_D3) using xdfopen with following
>>> script:
>>> dset ^./MYD08_D3.A2003121.005.2007081003101.hdf
>>> xdef XDim:mod08 360 linear -180.0 1.0
>>> ydef YDim:mod08 180 linear -90.0 1.0
>>> However, when I see the variables using ctlinfo, it shows more than one
>>> variables with the same variable name. For example, in the below lines,
>>>       
>> all
>>     
>>> three variables have same variable name deep_blue_aeros.
>>>
>>> Deep_Blue_Aerosol_Optical_Depth_550_Land_Mean=>deep_blue_aeros  0  y,x
>>> Deep blue aerosol optical depth at 0.55 microns for land (corrected):
>>>       
>> Mean
>>     
>> Deep_Blue_Aerosol_Optical_Depth_550_Land_Standard_Deviation=>deep_blue_aeros
>>     
>>> 0  y,x  Deep blue aerosol optical depth at 0.55 microns for land
>>> (corrected): Standard Deviation
>>> Deep_Blue_Aerosol_Optical_Depth_550_Land_Minimum=>deep_blue_aeros  0  y,x
>>> Deep blue aerosol optical depth at 0.55 microns for land (corrected):
>>> Minimum
>>>
>>> When I display the variable using d deep_blue_aeros, it doesn't show
>>> realistic image. I don't know which variable out of three is being
>>> displayed. Could anyone help on this?
>>>
>>>
>>> ------------------------------------------------------------------------
>>>
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>>>
>>>       
>> --
>>
>> Sergey Varlamov
>>
>> Research Institute for Global Change
>> JAMSTEC, JAPAN
>>
>>
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>>
>>     
>
>
>
>   
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-- 

Sergey Varlamov

Senior Scientist
Ocean Downscaled Prediction Research Team
Climate Variation Predictability and Applicability Research Program
Research Institute for Global Change
JAMSTEC, 3173-25 Showa-machi, Kanazawa-ku,
Yokohama, Kanagawa-ken, 236-0001 JAPAN
Tel: +81-45-778-5516  Fax: +81-45-778-5707
E-mail: vsm at jamstec.go.jp

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Varlamov Sergey