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SUBROUTINE GETGRDELEV(M,IERREL)
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USE BLK1MOD
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USE BLKMAP
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REAL*8 XXX,YYY
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XXX=XUSR(M)
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YYY=YUSR(M)
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! test for XXX and YYY outside grid limits
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IF(XXX .LT. XXORG-CELLSIZX/2. .OR. XXX .GT. XXORG+(FLOAT(NCOLS1)+0.5)*CELLSIZX) THEN
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WD(M)=-9998.
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RETURN
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ELSE
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IF(YYY .LT. YYORG-CELLSIZY/2. .OR. YYY .GT. YYORG+(FLOAT(NROWS1)+0.5)*CELLSIZY) THEN
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WD(M)=-9998.
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RETURN
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ENDIF
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ENDIF
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! Set row length in bytes and set temp origin
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LENROW=NCOLS1*4
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XORGT=XXORG
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YORGT=YYORG
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! Get row and column from lower left
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NCOL=INT((XXX-XORGT)/CELLSIZX)+1
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NROWU=INT((YYY-YORGT)/CELLSIZY)+1
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! Establish fraction within cell
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XFRAC=(XXX-XORGT-(NCOL-1)*CELLSIZX)/CELLSIZX
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YFRAC=(YYY-YORGT-(NROWU-1)*CELLSIZY)/CELLSIZY
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! Let fraction overlap outer edge
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IF(XFRAC .LT. 0.) XFRAC=0.
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IF(YFRAC .LT. 0.) YFRAC=0.
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! Set up file position across columns, up rows and combine
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NCOLFIL=(NCOL-1)*4
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IF(NGRTYP .EQ. 1) THEN
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NROWFIL=(NROWU-1)*LENROW
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ELSE
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NROWFIL=(NROWS1-NROWU+1)*LENROW
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ENDIF
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NFILPOS=NCOLFIL+NROWFIL
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! Read lower left the lower right allow fo upper limit
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READ(203,POS=NFILPOS+1) ELEVLL
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IF(NCOL .LT. NCOLS1) NFILPOS=NFILPOS+4
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READ(203,POS=NFILPOS+1) ELEVLR
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! Test for point ouside grid
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IF(ELEVLL .LT. -9000. .OR. ELEVLR .LT. -9000.) THEN
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WD(M)=-9998.
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RETURN
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ENDIF
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! Now mode to next row up and column
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IF(NGRTYP .EQ. 1) THEN
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NROWFIL= NROWU*LENROW
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ELSE
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NROWFIL=(NROWS1-NROWU)*LENROW
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ENDIF
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! NROWFIL=(NROWS1-NROWU)*LENROW
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NFILPOS=NCOLFIL+NROWFIL
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READ(203,POS=NFILPOS+1) ELEVUL
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IF(NCOL .LT. NCOLS1) NFILPOS=NFILPOS+4
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READ(203,POS=NFILPOS+1) ELEVUR
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! Test again
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IF(ELEVUL .LT. -9000. .OR. ELEVUR .LT. -9000.) THEN
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WD(M)=-9998.
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RETURN
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ENDIF
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! interpolate along along lower and upper level
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ELEVL=XFRAC*(ELEVLR-ELEVLL)+ELEVLL
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ELEVU=XFRAC*(ELEVUR-ELEVUL)+ELEVUL
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! Get final value, store and display
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AMAPVAL=YFRAC*(ELEVU-ELEVL)+ELEVL
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wd(m)=amapval
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FPN = WD(M)*10.
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X = CORD(M,1)
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Y = CORD(M,2) - .11
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IF(X .GT. 0. .AND. X .LT. HSIZE .AND. Y .GT. 0. .AND. Y .LT. 7.5) THEN
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CALL RRED
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CALL NUMBR(X,Y,0.1,FPN,0.0,-1)
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endif
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RETURN
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END
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