CMORPH 0.25 degree DAILY Information

This data set contains  0.25 degree resolution daily global CMORPH
precipitation data during DYNAMO (August 2011 through March 2012).
CMORPH is the CPC Morphing technique which derives precipitation estimates
from low orbiter satellite microwave observations.  The data are in binary
format and were provided by NOAA/CPC.
 

The data are compressed using the standard Unix compress function (files have a
suffix of ".Z"). Each file is composed of 2 direct access binary ("big_endian")
records that are defined as follows:

Record 1: contains the merged microwave precipitation only (GrADS variable: comb)
Record 2: contains the "CMORPH" precipitation estimates (GrADS variable: cmorph)

All units are "mm/hr".  Missing data are denoted by values of "-9999."
Each record contains a 1440 x 480 REAL*4 array of data which
is oriented from 0.125E EASTward and from 59.875N SOUTHward, with a grid increment
of 0.25 degrees of latitude and longitude.  Thus, the grid locations are the
centers of a 0.25 degree lat/lon grid box.  Note that these estimates represent
spatial averages, so the data aare grid-centered, rather than lattice-centered.

For example (1,1) is 0.125E, 59.875N
            (2,2) is 0.375E, 59.625N
	    
	    
	    , etc.
	    
	    
The daily accumulation period is 00Z thru 23:59Z.

For GrADS users, a descriptor ("ctl") file CMORPH+MWCOMB_025deg-daily.ctl
is included with your order.

For further information about these data see the reference:

Joyce, R. J., J. E. Janowiak, P. A. Arkin, and P. Xie, 2004: CMORPH: A
method that produces global precipitation estimates from passive microwave
and infrared data at high spatial and temporal resolution.. J. Hydromet., 5,
487-503.

The data were provided by Robert Joyce (robert.joyce@noaa.gov) from NOAA/CPC.


Sample FORTRAN code for reading the data sets is provided below

      program readday

      parameter (IRMAX=1440, JRMAX=480, PMAX=2)

      character*115 in1ssmipropREGD
      real*4 ssmipropREGD(IRMAX,JRMAX,PMAX)

      write (*,*) ' enter day ie 20041107 '
      read (*,*) iyrmndy

c    Open input daily 0.25 deg lat/lon CMORPH rainfall file

      in1ssmipropREGD = '/export-2/sgi109/irstat/blended_tech/cpc/data/0
     &25deg/YYYY0M0D_dly-025deg_cpc+comb'
      write (in1ssmipropREGD(54:61),'(i8)') iyrmndy
      write(6,'('' file '',a88)') in1ssmipropREGD

      open (unit=16, file=in1ssmipropREGD, access='direct',
     &              recl=1440*480*2*4, form='unformatted')

c    Read daily me derived regional precip to disk

      read (16, rec = 1) ssmipropREGD

      write (6,'(/,'' daily CMORPH '')')
      do jreg = 121, 140
       write(6,'(15(f5.1))') (ssmipropREGD(ireg,jreg,2),ireg=581,595)
      enddo

      stop

      end