Step1: Make sure your personal computer is installed with Matlab(any version is available )
Step2：Download the data from NASA website
http://mirador.gsfc.nasa.gov/cgi-bin/mirador/presentNavigation.pl?tree=project&project=TRMM&dataGroup=Orbital&CGISESSID=66232b166b683630dfde5075b086bba4&location=(-90,-180),(90,180)
and choose by date and make sure the orbits of TRMM in your data can cover the domain you want to select.
(in 2A25 you can find a logo near the size information, you can use it to check the orbit of your data)
Step3 :Use Matleb intrinsic function hdftool
Step4: There will be a message box popping out
Step 5:expand the column and select the data that you want to import
EX: find the scan navigation,which can show the track of your satellite.
you can use "import" bottom or the import command to get the matrix you want.
Step6:the dimension of matrixes have different meanings
if the dimension is 9249*1--->9249=time step,1=the value of measure on the Nadir(星下點)
if the dimension is 9249*49--> 9249=time step,49=the 49 pixels near the Nadir
if the dimension is 9249*49*2 (or 9249*49*6)--> 2 and 6 can be different parameter for the RADAR function
if the dimension is 9249*49*80--> 80 means the vertical measurement(cross section)
For more detail information can be found in the guide book
http://www.eorc.jaxa.jp/TRMM/document/text/handbook_e.pdf
