SUBROUTINE oda_masksf(CDFAM) 3
      use modmask, only : lmasksf_in, lmasksf_out, lmask, ldiagsf, ldiag
#if defined (DOC)
*
*Purpose : Defines a mask of assimilated data
*
*Author  : S. Pellerin, ARMA, January 2009
*          Based on selection made in observation operator as written by
*          P. Koclas *CMC/AES in September 1994
*
*REVISION:
*
*          Y. Yang, ARQI Feb. 2010
*           - Switched order of comnumbr.cdk and cvcord.cdk due to dependencies
#endif
      IMPLICIT NONE
      REAL*8 PJO
      CHARACTER *2 CDFAM
*implicits
#include "comdimo.cdk"
#include "comoabdy.cdk"
#include "comoahdr.cdk"
#include "comoba.cdk"
#include "comnumbr.cdk"
#include "cvcord.cdk"
*
      INTEGER IBEGIN,ILAST,ILASTOB,IBEGINOB,IDATEND
      INTEGER J,JDATA,JO,IDATA,ITYP
C
C     Temperature lapse rate for extrapolation of gz below model surface
C
      DO J = 1,NFILES
        IF ( (CFAMTYP(J) .EQ. CDFAM) .AND.( NBEGINTYP(J) .GT. 0) )
     &       THEN
          IBEGIN=NBEGINTYP(J)
          ILAST=NENDTYP(J)
C
C     Process all data within the domain of the model
C
          IBEGINOB = MOBDATA(NCMOBS,IBEGIN)
          ILASTOB  = MOBDATA(NCMOBS,ILAST)
          DO JO = IBEGINOB, ILASTOB
            IDATA   = MOBHDR(NCMRLN,JO)
            IDATEND = MOBHDR(NCMNLV,JO) + IDATA - 1
            DO JDATA=IDATA,IDATEND
              IF ( MOBDATA(NCMVCO,JDATA) .EQ. 1 ) THEN
                ITYP = MOBDATA(NCMVNM,JDATA)
                IF (ITYP.EQ.NETS .OR. ITYP.EQ.NEPS
     &               .OR.ITYP.EQ.NEPN .OR. ITYP.EQ.NESS
     &               .OR.ITYP.EQ.NEUS .OR. ITYP.EQ.NEVS) THEN
                  LMASKSF_IN(JDATA)=(MOBDATA(NCMASS,JDATA) .EQ. 1)
                ELSE
                  LMASKSF_IN(JDATA)=(MOBDATA(NCMASS,JDATA) .EQ. 1 .AND.
     &                 MOBDATA(NCMXTR,JDATA)  .EQ. 0)
                ENDIF
                IF ( MOBDATA(NCMVNM,JDATA) .EQ. NEHS) then
                  ldiagsf(jdata) = .true.
                endif
              ENDIF
            END DO
          enddo
C
C     Process all geopotential data below model's orography
C
          DO JDATA=IBEGIN,ILAST
            lmasksf_out(jdata)=(MOBDATA(NCMASS,JDATA) .EQ. 1)
     &           .AND. (MOBDATA(NCMXTR,JDATA) .EQ. 2)
     &           .AND. (MOBDATA(NCMVNM,JDATA) .EQ. NEGZ )
     &           .AND. (MOBDATA(NCMVCO,JDATA) .EQ. 1)
C
          END DO
C
        ENDIF
      END DO

      lmask = lmask .or. lmasksf_in
      lmask = lmask .or. lmasksf_out
      ldiag = ldiag .or. ldiagsf
C--------------------------------------------------------------------
      RETURN
      END