!-------------------------------------- LICENCE BEGIN ------------------------------------
!Environment Canada - Atmospheric Science and Technology License/Disclaimer,
!                     version 3; Last Modified: May 7, 2008.
!This is free but copyrighted software; you can use/redistribute/modify it under the terms
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!

      sUBROUTINE SETFGEFAM(CDFAM) 15,1
#if defined (DOC)
*
***s/r SETFGEFAM   - Interpolation of THE FIRST GUESS ERROR VARIANCES
*
*
*Author  : P. Koclas *CMC/CMSV November 1998
*Revision:
*
**    Purpose:  -Interpolate vertically the contents of commvo to
*                the pressure levels of the observations. Then
*                compute THE FIRST GUESS ERROR VARIANCES
*                A linear interpolation in ln(p) is performed.
*
*
*
#endif
      IMPLICIT NONE
*implicits
#include "comlun.cdk"
#include "comdim.cdk"
#include "comdimo.cdk"
#include "comoabdy.cdk"
#include "comoahdr.cdk"
#include "comoba.cdk"
#include "commvo.cdk"
#include "cvcord.cdk"
*
      CHARACTER*2 CDFAM
      INTEGER IPB,IPT
      INTEGER IOBS,IPOS,IK,IBEGIN,ILAST
      INTEGER J,JDATA
      REAL*8 ZWB,ZWT
      REAL*8 ZLEV,ZPB,ZPT
C
      DO J = 1,NFILES
      IF ( (CFAMTYP(J) .EQ. CDFAM ) .AND.( NBEGINTYP(J) .GT. 0) ) THEN
         IBEGIN=NBEGINTYP(J)
          ILAST=NENDTYP(J)
C
C*    1. Computation of sigmap
C     .  -----------------------------
C
 100  CONTINUE
C
        write(nulout,*) 'setfgefam: CDFAM=',CDFAM
        write(nulout,*) 'setfgefam: IBEGIN,ILAST=',IBEGIN,ILAST
         DO JDATA=IBEGIN,ILAST
ccc            IF ( MOBDATA(NCMASS,JDATA) .EQ. 1) then
            IF ( MOBDATA(NCMASS,JDATA) .EQ. 1 .AND.
     &           MOBDATA(NCMVCO,JDATA) .EQ. 2      ) then
            IF  (MOBDATA(NCMXTR,JDATA) .NE. 0) THEN
               IK=NFLEV-1
               IOBS = MOBDATA(NCMOBS,JDATA)
               IPOS = MOBDATA(NCMPOS,JDATA)
               IPT  = IK + IPOS*NFLEV
               IPB  = IPT +1
               ROBDATA(NCMFGE,JDATA) = GOMOBS(IPB,IOBS)
            ELSE
               IOBS = MOBDATA(NCMOBS,JDATA)
               IPOS = MOBDATA(NCMPOS,JDATA)
               ZLEV = ROBDATA8(NCMPPP,JDATA)
               IK   = ROBDATA(NCMLYR,JDATA)
               IPT  = IK + IPOS*NFLEV
               IPB  = IPT+1
               ZPT  = RPPOBS(IK,IOBS)
               ZPB  = RPPOBS(IK+1,IOBS)
               ZWB  = LOG(ZLEV/ZPT)/LOG(ZPB/ZPT)
               ZWT  = 1.0D0 - ZWB
C
C              FIRST GUESS ERROR VARIANCE
C
               ROBDATA(NCMFGE,JDATA) =
     +         ( ZWB*GOMOBS(IPB,IOBS) + ZWT*GOMOBS(IPT,IOBS) )
               if(ROBDATA(NCMFGE,JDATA).le.0.) then
                 write(nulout,*) 'SETFGEFAM: CDFAM = ',CDFAM
                 write(nulout,*) 'SETFGEFAM: GOMOBS(IPB,IOBS)=',GOMOBS(IPB,IOBS)
                 write(nulout,*) 'SETFGEFAM: GOMOBS(IPT,IOBS)=',GOMOBS(IPT,IOBS)
                 CALL ABORT3D(NULOUT,'SETFGEFAM: First-guess stdev bad value')
               endif
            ENDIF
            ENDIF
C
         END DO
 200  CONTINUE
C
      ENDIF
      END DO
C
      RETURN
      END