Thanks all of you for the useful information.<br><br>
<div class="gmail_quote">On Thu, Oct 4, 2012 at 8:56 PM, Lynnes, Christopher S. (GSFC-6102) <span dir="ltr"><<a href="mailto:christopher.s.lynnes@nasa.gov" target="_blank">christopher.s.lynnes@nasa.gov</a>></span> wrote:<br>
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<div>BTW, a little extra info for folks not familiar with the data classification system used by NASA and some other remote sensing agencies:</div>
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<div>"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.)</div>
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<div>'L-3' data, on the other hand, ARE projected to a recognizable (by GrADS) grid.</div>
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<div>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.)</div>
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<div>Dear Ahsan,<br><br>GrADS can't read TRMM L-2 products including 2A23. You might consider<br>to use other software packages, such as those listed here, <br><br><a href="http://disc.sci.gsfc.nasa.gov/precipitation/additional/tools" target="_blank">http://disc.sci.gsfc.nasa.gov/precipitation/additional/tools</a><br>
<br>For TRMM L-3 products, we have these sample ctl files,<br><br><a href="http://disc.sci.gsfc.nasa.gov/precipitation/Samples_ctl_TRMM_V7.pdf" target="_blank">http://disc.sci.gsfc.nasa.gov/precipitation/Samples_ctl_TRMM_V7.pdf</a><br>
<br>Hope these help.<br><br>Regards,<br><br>-Zhong<br></div></div></blockquote></div><br>
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<div>--</div>Dr. Christopher Lynnes NASA/GSFC, Code 610.2 phone: 301-614-5185<br><br></span></div><br></div><br>_______________________________________________<br>gradsusr mailing list<br><a href="mailto:gradsusr@gradsusr.org">gradsusr@gradsusr.org</a><br>
<a href="http://gradsusr.org/mailman/listinfo/gradsusr" target="_blank">http://gradsusr.org/mailman/listinfo/gradsusr</a><br><br></blockquote></div><br><br clear="all"><br>-- <br>Syed Ahsan Ali Bokhari <br>Electronic Engineer (EE)
<div><br>Research & Development Division<br>Pakistan Meteorological Department H-8/4, Islamabad.<br>Phone # off +92518358714</div>
<div>Cell # +923155145014<br></div><br>