This dataset is created from the TRMM products 3B42 in 
the GSFC Earth Sciences (GES) Distributed Active Archive
Center (DAAC), NASA. The combined instrument rain calibration 
algorithm (3B42) uses combined rain structure (2B31) 
and VIRS calibration (1B01) to adjust IR estimates 
from geosynchronous IR observations. Global estimates
are made by adjusting the GOES Precipitation Index (GPI)
to the TRMM estimates. The output is rainfall for 1 x 1 
degree grid boxes for an 1-day period. 
For detail information, please see:
http://daac.gsfc.nasa.gov/hydrology/TRMM_README/TRMM_3B42_readme.shtml

Variables:
ppecip       1  99 ** Adjusted GPI precipitation estimate [unit: mm/hr]
rel_error    1  99 ** Adjusted GPI relative error estimate [unit: mm/hr]

For FORTRAN users,

        parameter (lons=360,lats=80,kdays=2191,iparam=2)
        open(8,file='daac_trmm_3b42_daily_1998_03.dat',
     &  form='unformatted',access='sequential')


        do k=1,kdays
        do kk=1,iparam
        read(8) ((xx(i,j,kk),i=1,lons),j=1,lats)
c       kk=1: Adjusted GPI precipitation estimate [unit: mm/hr]
c       kk=2: Adjusted GPI relative error estimate [unit: mm/hr]
        enddo
        enddo

Contact:
Yongsheng Zhang, yszhang@hawaii.edu
Aug. 25, 2003