Re: Problem regarding analysing TRMM 2A25 orbital HDF data in NCL

The information at the link you provided was manually
added to the script. The plot is in correct range of data.

attached

On 8/13/12 9:55 AM, Madhuparna Mukherjee wrote:
>
>
> Dear Sir,
> Thank you for your kind help.In the link http://disc.sci.gsfc.nasa.gov/precipitation/documentation/TRMM_README/TRMM_2A25_readme.shtml/
> it is written that the value of Corrected Z-factor should be in the range of 0-80dBZ.But In the attached plot obtained,using the script you provided is showing very high value.Even if the values are scaled by 100 (as mentioned in website),the values are in the range of -9000 to 1000. The missing value maintioned here is -9999 and ground clutter is -8888.
> This work is a part of my Ph.D work,so if you kindly help in this regard I will be very grateful.
>
>
> Thanking you in anticipation.
>
> Madhuparna
> Research Scholar
> Indian Institute Of Tropical Meteorology,Pune
> India
>
> ----- Original Message -----
> From: "Dennis Shea" <shea@ucar.edu>
> To: "Madhuparna Mukherjee" <mparna@tropmet.res.in>
> Cc: ncl-talk@ucar.edu
> Sent: Thursday, August 9, 2012 7:25:41 PM
> Subject: Re: Problem regarding analysing TRMM 2A25 orbital HDF data in NCL
>
> These 2A25 hdf files are poorly constructed. HDF and netCDF are supposed
> tp be 'self-describing'. Unfortunately, there is no file information
> that indicates what -8888 represents. It should be set to _FillValue.
>
> See attached
>
> On 8/8/12 11:51 PM, Madhuparna Mukherjee wrote:
>>
>>
>> Dear Sir/Madam,
>> I am using TRMM 2A25 orbital (in HDF format) data.Using read_2A25.ncl script I am trynig to read the .HDF data but the plot I am getting,giving very high order value of reflectivity(dBZ), though in TRMM website it is written that the range of the data is 0-80dBZ.
>>
>> How to exclude the value assigned for ground clutter (-8888) is also not clear.
>>
>> If you can provide the program to read TRMM 2A25 orbital HDF data or if you can help me to rectify the script I used for reading the data I will be grateful.
>>
>> Thanking You,
>> Madhuparna
>> Research Scholar
>> Indian Institute Of Tropical Meteorology,Pune
>> India
>>
>>
>>
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• text/plain attachment: 2A25.ncl