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

[Lynnes, Christopher S. (GSFC-6102)]

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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