[gradsusr] [Ticket 21816] New: How to open TRMM hdf files.

[Syed Ahsan Ali]

Thanks all of you for the useful information.

On Thu, Oct 4, 2012 at 8:56 PM, Lynnes, Christopher S. (GSFC-6102) <
christopher.s.lynnes at nasa.gov> wrote:

>  BTW, a little extra info for folks not familiar with the data
> classification system used by NASA and some other remote sensing agencies:
>
> "L-2" (aka Level 2) data are produced in the satellite's native
> swath/orbit coordinates, not on a recognizable geographic (e.g., lat/lon)
> grid. This is why they are resistant to GrADS usage.  (There is an esoteric
> way to use it, but it's a bit complicated and you lose any geographic
> referencing. So we don't recommend it.)
>
> 'L-3' data, on the other hand, ARE projected to a recognizable (by GrADS)
> grid.
>
> For TRMM data, you can tell whether it is Level 2 or 3 by the first digit,
> so 2A23 is Level 2 and 3B42 is Level 2. (This does not hold for other NASA
> datasets; they all have different conventions.)
>
>  Dear Ahsan,
>
> GrADS can't read TRMM L-2 products including 2A23. You might consider
> to use other software packages, such as those listed here,
>
> http://disc.sci.gsfc.nasa.gov/precipitation/additional/tools
>
> For TRMM L-3 products, we have these sample ctl files,
>
> http://disc.sci.gsfc.nasa.gov/precipitation/Samples_ctl_TRMM_V7.pdf
>
> Hope these help.
>
> Regards,
>
> -Zhong
>
>
>  --
> Dr. Christopher Lynnes     NASA/GSFC, Code 610.2    phone: 301-614-5185
>
>
>
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-- 
Syed Ahsan Ali Bokhari
Electronic Engineer (EE)

Research & Development Division
Pakistan Meteorological Department H-8/4, Islamabad.
Phone # off  +92518358714
Cell # +923155145014
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