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246 lines
10 KiB
Fortran
246 lines
10 KiB
Fortran
!----------------------------------------------------------------elevint
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subroutine elevint(XX,YY,soln)
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!----------------------------------------------------------------------c
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! purpose: c
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! To interpolate elevation from map data. c
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!----------------------------------------------------------------------c
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! Input data: c
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! (XX, YY) -- a coordinate
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!----------------------------------------------------------------------c
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! Output data: c
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! soln -- elevation value c
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!----------------------------------------------------------------------c
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USE BLKMAP
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USE BLK1MOD
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! INCLUDE 'BLK1.COM'
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INCLUDE 'TXFRM.COM'
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!IPK MAY02 COMMON /TXFRM/ XS, YS, TXSCAL
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INTEGER LISTM,NLIST
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DIMENSION NLIST(200),ADIST(200)
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DIMENSION LISTM(1000),listt(60,4),nlf(4),icomp(4),xnear(4)
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! common /mapc/imap(maxpl)
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!
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! Establish size for range
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!
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JS=1
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K=0
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KPT=0
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DO 120 J=1,MAXPTS
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!
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! Determine how long each line is
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!
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MLEN=J-JS
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! print *,XMAP(J),VDX,MAXPTS,MLEN,J,JS
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IF(CMAP(J,1) .LT. VDX) THEN
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!
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! Now check it.
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!
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K=K+1
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IF(MLEN .GT. 1) THEN
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! LTP=LINTYP(K)
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DO 110 M=1,MLEN
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IF(VAL(JS+M-1) .GT. -9000.) THEN
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KPT=KPT+1
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ENDIF
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110 CONTINUE
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ENDIF
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NMAP=J
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IF(MLEN .EQ. 0) GO TO 130
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JS=J+1
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go to 120
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ENDIF
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cxcur=xmap(j)
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cycur=ymap(j)
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120 END DO
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130 CONTINUE
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!
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! Estimate areal density to get 100 points
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!
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ADEN=AMAP*40./(FLOAT(KPT)*TXSCAL**2)
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!
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! Find square coverage
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!
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XNEARS=SQRT(ADEN)
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xnearo=xnears
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!
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! initialize range
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!
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ict=0
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xnears=xnearo
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do nang=1,4
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XNEAR(nang)=XNEARO
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icomp(nang)=0
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enddo
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!
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! set imap to zero to start or -1 if no value
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!
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220 continue
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do n=1,nmap
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if(cmap(n,1) .lt. vdx) then
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imap(n)=-1
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elseif(val(n) .lt. -9000.) then
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imap(n)=-1
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else
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imap(n)=0
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endif
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enddo
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!
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! initialize list and completeness test
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!
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do nang=1,4
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icomp(nang)=0
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do n=1,50
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listt(n,nang)=0
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enddo
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enddo
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!
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! start processing
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!
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280 continue
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!
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! check for completeness intialize counter
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!
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do nang=1,4
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if(icomp(nang) .eq. 0) then
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nlf(nang)=0
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else
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ict=ict+1
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endif
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enddo
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!
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! if ict = 4 we are done
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!
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if(ict .lt. 4) then
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!
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! loop through map points
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!
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DO 300 N=1,NMAP
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!
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! skip if no useful value
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!
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if(imap(n) .eq. -1) go to 300
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!
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! use nang if we have been through before
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!
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if(imap(n) .gt. 0) then
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nang=imap(n)
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!
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! skip to end if done
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!
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if(icomp(nang) .eq. 1) then
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go to 300
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endif
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!
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! otherwise check range skipping out if out of range
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!
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d1=cmap(n,1)-XX
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d2=cmap(n,2)-YY
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IF(ABS(D1) .GT. XNEAR(NANG)) THEN
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IMAP(N)=-1
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GO TO 300
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ELSEIF(ABS(D2) .GT. XNEAR(NANG)) THEN
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IMAP(N)=-1
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GO TO 300
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ENDIF
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!
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! process new point checking range and setting direction
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!
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else
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d1=cmap(n,1)-XX
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d2=cmap(n,2)-YY
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IF(ABS(D1) .LT. XNEAR(1)) THEN
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IF(ABS(D2) .LT. XNEAR(1)) THEN
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if(d1 .lt. 0) then
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if(d2 .lt. 0) then
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imap(n)=3
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nang=3
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else
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imap(n)=2
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nang=2
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endif
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elseif(d2 .lt. 0) then
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imap(n)=4
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nang=4
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else
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imap(n)=1
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nang=1
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endif
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!
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! set to skip out if out of range
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!
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ELSE
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imap(n)=-1
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go to 300
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ENDIF
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ELSE
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imap(n)=-1
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go to 300
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ENDIF
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endif
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!
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! save value if total less then 50
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!
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NLF(NANG)=NLF(NANG)+1
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IF(NLF(NANG) .LT. 51) THEN
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LISTT(NLF(NANG),NANG)=N
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ENDIF
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300 CONTINUE
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!
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! now reset range if we need to
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!
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ictz=0
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do nang=1,4
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if(nlf(nang) .gt. 50) then
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rat=sqrt(45./nlf(nang))
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if(rat .lt. 0.2) rat=0.2
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xnear(nang)=xnear(nang)*rat
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elseif(nlf(nang) .eq. 0) then
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if(xnear(nang) .eq. xnears) then
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ictz=ictz+1
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else
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icomp(nang)=1
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endif
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else
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icomp(nang)=1
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endif
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enddo
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if(ictz .gt. 1) then
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do nang=1,4
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xnear(nang)=xnear(nang)*2.
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xnears=xnears*2.
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enddo
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if(xnear(1) .lt. 4.) then
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go to 220
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endif
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endif
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!
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! go back and try again
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!
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go to 280
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endif
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!
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! finished now compact list
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!
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nlg=0
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do nang=1,4
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nlim=nlf(nang)
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if(nlim .eq. 0) then
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nlim=50
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endif
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do nlgg=1,nlim
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if(listt(nlgg,nang) .gt. 0) then
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nlg=nlg+1
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listm(nlg)=listt(nlgg,nang)
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endif
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enddo
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enddo
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!
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!-----perform interpolation
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!
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SOLN=-9999.0
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CALL GRIDIN(XX,YY,SOLN,LISTM,NLG)
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return
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END
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