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!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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***S/P AGGCOVERURB
*

      SUBROUTINE AGGCOVERURB( FCOVER, TABLEN, TABLES, AGGF, LAT,  24
     1                        NI, NCLASSURB, NCLASS)        
*
*
#include "impnone.cdk"
*
*
      INTEGER NI, NCLASSURB, NCLASS
      REAL AGGF(NI), FCOVER(NI,NCLASS+NCLASSURB), TABLEN(NCLASSURB)
      REAL TABLES(NCLASSURB), LAT(NI)
*
*
*Author
*        Aude Lemonsu
*
*Revisions
* 001    B. Bilodeau (Jul 2007)    - Correct inconsistency caused by critmask
*
*Object
*        Aggregation of urban fields 
*
*
*Arguments
*
*            - Input -
* FCOVER     Fraction of land covers (masks)
* TABLEN     Geophysical fields values for each type of vegetation (northern hemisphere)
* TABLES     Geophysical fields values for each type of vegetation (southern hemisphere)
* LAT        Latitude
*
*            - Output -
* AGGF       Aggretated geophysical field representative of an entire
*            grid area
*
*            - Input -
* NI         Horizontal dimension
* NCLASS     Number of natural landuse classes
* NCLASSURB  Number of urban landuse classes
*
*
#include "surfacepar.cdk"
*
*
      INTEGER I,M
*
      REAL totfract, table_val
*
*
      DO i=1,ni
        aggf(i) = 0.0
      END DO
*
*
*
      DO i=1,ni
        totfract = 0.
        DO m=1,nclassurb                     ! loop on urban classes
          totfract = totfract + fcover(i,m+nclass)
        END DO
        IF (totfract.GT.0.) THEN
          DO m=1,nclassurb                   ! loop on urban classes
            if (lat(i).ge.0.0) then    
*              northern hemisphere
               table_val = tablen(m)
            else
*              southern hemisphere
               table_val = tables(m)
            endif
            aggf(i) = aggf(i) 
     1              + fcover(i,m+nclass) * table_val
          END DO
          aggf(i) = aggf(i) / totfract
        END IF
      END DO
*
*
*
      RETURN
      END