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R2tap.f
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!== last modified 4-9-2002
SUBROUTINE R2TAP(VOLEQ,DBHOB,D30,H30,TOP6,HT1,HT2,D2,DBTBH,errflg)
C (TAPEQU-INT DBHOB-R HT1-R HT2-R D2-R)
C
C###########################################################
C CHARACTER*3 TNIRP/'YES'/
C CHARACTER*1 NEWPG
C###########################################################
CHARACTER*3 MDL
CHARACTER*10 VOLEQ
REAL DBHOB, HT1, HT2, D2, D30, H30, TOP6, D30IB,DBTBH
REAL*8 R2MBB(4,8), R2MBA(2,8), R2CZC(3,8)
REAL*8 EDBH(2,8), R23PA(2,8), R23PB(2,8)
REAL*8 DBH, HTTOT, HTUP, DIBUP, DIBCOR
REAL*8 COFI, TERM1, TERM2, TERM3, TERM4
REAL*8 E, R1, R2, R3, B1, B2, EDBHIB
PARAMETER(E=2.7182818284)
INTEGER SP,errflg
C***********************************************************
C***** COEFFICIENTS FOR TWO PARAMETER MODEL ************
C***********************************************************
C
C COFFICIENTS FOR MAX AND BURKHART MODEL (B1,B2,B3,B4)
C ASPEN (1)
DATA ((R2MBB(I,J),I=1,4),J=1,8)
> /-5.18995,2.57262,-3.85160,117.934,
C LODGEPOLE (2)
> -3.65010,1.45492,-2.20082, 52.058,
C PONDEROSA PINE BLACK HILLS (3)
> -2.59737,0.96927,-1.43195, 50.867,
C PONDEROSA PINE OTHER (4)
> -3.80739,1.75784,-3.56366, 55.776,
C WHITE FIR (5)
> -2.91187,1.26772,-3.76391, 58.596,
C SUBALPINE FIR (6)
> -3.11638,1.46021,-2.63725,105.472,
C ENGELMANN SPRUCE (7)
> -2.26300,0.92540,-0.80682,382.694,
C DOUGLAS FIR (8)
> -5.86345,2.98778,-4.12919, 82.838/
C COFFICIENTS FOR MAX AND BURKHART MODEL (A1,A2)
C ASPEN (1)
DATA ((R2MBA(I,J),I=1,2),J=1,8)
> / 0.69, 0.09,
C LODGEPOLE (2)
> 0.77, 0.11,
C PONDEROSA PINE BLACK HILLS (3)
> 0.75, 0.11,
C PONDEROSA PINE OTHER (4)
> 0.62, 0.13,
C WHITE FIR (5)
> 0.50, 0.13,
C SUBALPINE FIR (6)
> 0.55, 0.09,
C ENGELMANN SPRUCE (7)
> 0.65, 0.05,
C DOUGLAS FIR (8)
> 0.72, 0.12/
C COFFICIENTS FOR CZAPLEWSKI SECOND-STAGE
C MODEL (C1,C2,C3)
DATA ((R2CZC(I,J),I=1,3),J=1,8) /
C ASPEN (1)
> 1.0,0.0,0.0,
C LODGEPOLE (2)
> 1.0876,-0.0080764,0.0,
C PONDEROSA PINE BLACK HILLS (3)
> 1.1331,-0.0095335,0.0,
C PONDEROSA PINE OTHER (4)
> 1.1251,-0.0082315,0.0,
C WHITE FIR (5)
> 1.0,0.0,0.0,
C SUBALPINE FIR (6)
> 1.0,0.0,0.0,
C ENGELMANN SPRUCE (7)
> 1.1263,-0.0080396,0.0,
C DOUGLAS FIR (8)
> 1.0,0.0,0.0/
C***********************************************
C***** COFFICIENTS FOR THREE PARAMETER MODEL
C***********************************************
C DBH INSIDE BARK COEFFICIENTS (A,B)
C ASPEN (1)
DATA ((EDBH(I,J),I=1,2),J=1,8)
> / -0.018759, 0.931816,
C LODGEPOLE (2)
> -0.161248, 0.977231,
C PONDEROSA PINE BLACK HILLS (3)
> -0.75702, 0.961789,
C PONDEROSA PINE OTHER (4)
> -0.653970, 0.950056,
C WHITE FIR (5)
> -1.078182, 0.969977,
C SUBALPINE FIR (6)
> -0.330462, 0.961494,
C ENGELMANN SPRUCE (7)
> -0.664774, 0.995785,
C DOUGLAS FIR (8)
> -0.710803, 0.942278/
C MAX AND BURKHART COEFFICIENTS (A1,A2)
C ASPEN (1)
DATA ((R23PA(I,J),I=1,2),J=1,8)
> / 0.69, 0.09,
C LODGEPOLE (2)
> 0.77, 0.11,
C PONDEROSA PINE BLACK HILLS (3)
> 0.75, 0.11,
C PONDEROSA PINE OTHER (4)
> 0.62, 0.13,
C WHITE FIR (5)
> 0.50, 0.13,
C SUBALPINE FIR (6)
> 0.55, 0.09,
C ENGELMANN SPRUCE (7)
> 0.65, 0.05,
C DOUGLAS FIR (8)
> 0.72, 0.12/
C MAX AND BURKHART COEFFICIENTS (B3,B4)
C ASPEN (1)
DATA ((R23PB(I,J),I=1,2),J=1,8)
> / -4.29592, 117.934,
C LODGEPOLE (2)
> -3.00413, 52.058,
C PONDEROSA PINE BLACK HILLS (3)
> -2.40572, 50.867,
C PONDEROSA PINE OTHER (4)
> -4.45250, 55.776,
C WHITE FIR (5)
> -4.42031, 58.596,
C SUBALPINE FIR (6)
> -3.12030, 105.472,
C ENGELMANN SPRUCE (7)
> -1.11960, 382.694,
C DOUGLAS FIR (8)
> -6.62047, 82.838/
C*************************************************************
C THIS IS THE START OF THE MAIN LOGIG
C ************************************************************
C CONVERT VALUES TO DOUBLE PRECISION FOR CACULATIONS
DBH = DBHOB
HTTOT = HT1
HTUP = HT2
MDL = VOLEQ(4:6)
IF(VOLEQ(8:10).EQ.'746')THEN
SP = 1
ELSEIF(VOLEQ(8:10).EQ.'108')THEN
SP = 2
ELSEIF(VOLEQ(8:10).eq.'122' .AND. VOLEQ(1:3).EQ.'203')THEN
SP = 3
ELSEIF(VOLEQ(8:10).eq.'122' .AND. VOLEQ(1:3).EQ.'200')THEN
SP = 4
ELSEIF(VOLEQ(8:10).eq.'015')THEN
SP = 5
ELSEIF(VOLEQ(8:10).eq.'019')THEN
SP = 6
ELSEIF(VOLEQ(8:10).eq.'093')THEN
SP = 7
ELSEIF(VOLEQ(8:10).eq.'202')THEN
SP = 8
else
errflg = 1
d2 = 0
return
ENDIF
C*************************************************************
C 2-PARAMETER MODEL *******
C*************************************************************
IF(MDL.EQ.'CZ2' .OR. MDL.EQ.'cz2') THEN
C MAX AND BURKHART PORTION TO CALCULATE DIB ******************
IF (HTUP .GT. HTTOT) HTUP = HTTOT
TERM1 = R2MBB(1,SP)*((HTUP/HTTOT)-1)
TERM2 = R2MBB(2,SP)*(((HTUP**2)/(HTTOT**2))-1)
IF ( (HTUP/HTTOT) .LT. R2MBA(1,SP)) THEN
COFI = 1.0
ELSE
COFI = 0.0
ENDIF
TERM3 = ((R2MBA(1,SP)-(HTUP/HTTOT))**2)*COFI
TERM3 = R2MBB(3,SP)*TERM3
IF ( HTUP/HTTOT .LT. R2MBA(2,SP)) THEN
COFI = 1.0
ELSE
COFI = 0.0
ENDIF
TERM4 = ((R2MBA(2,SP)-(HTUP/HTTOT))**2)*COFI
TERM4 = R2MBB(4,SP)*TERM4
IF (TERM1+TERM2+TERM3+TERM4 .LT. 0) THEN
DIBUP = 0.0
ELSE
DIBUP = DBH*SQRT(TERM1+TERM2+TERM3+TERM4)
ENDIF
C CZAPLEWSKI PORTION ****************************************
C CALCULATE DIB
TERM1 = R2CZC(1,SP)
TERM2 = R2CZC(2,SP)*DBH
TERM3 = R2CZC(3,SP)*(HTUP**2)
DIBCOR = DIBUP*(TERM1+TERM2+TERM3)
D2 = DIBCOR
C****************************************************************
C USE NEW THREE PARAMETER MODEL ************
C****************************************************************
ELSEIF(MDL.EQ.'CZ3' .OR. MDL.EQ.'cz3') THEN
IF (DBTBH.GT.0) THEN
EDBHIB = DBH - DBTBH
ELSE
EDBHIB = EDBH(2,SP)*DBH + EDBH(1,SP)
ENDIF
D30IB = D30*(1.0-(1.0-EDBHIB/DBH)*(1.0/(2.0-D30/DBH)))
R1 = HTUP/HTTOT
R2 = 4.5/HTTOT
R3 = H30/HTTOT
B1 = ((EDBHIB/DBH)**2)*((R3**2)-1.) + ((D30IB/DBH)**2)*
> (1.-R2**2)
IF(R3.LT.R23PA(1,SP)) THEN
B1 = B1 + R23PB(1,SP)*((R2**2)-1.)*((R23PA(1,SP)-R3)**2)
ENDIF
IF(R2.LT.R23PA(1,SP)) THEN
B1 = B1 + R23PB(1,SP)*(1-(R3**2))*((R23PA(1,SP)-R2)**2)
ENDIF
IF(R3.LT.R23PA(2,SP)) THEN
B1 = B1 + R23PB(2,SP)*((R2**2)-1.)*((R23PA(2,SP)-R3)**2)
ENDIF
IF(R2.LT.R23PA(2,SP)) THEN
B1 = B1 + R23PB(2,SP)*(1.-(R3**2))*((R23PA(2,SP)-R2)**2)
ENDIF
B1 = B1/(((1.-R2)*(1.-R3**2))-((1.-R2**2)*(1.-R3)))
B2 = B1*(R3-1.)-((D30IB/DBH)**2)
IF(R3.LT.R23PA(1,SP)) THEN
B2 = B2 + R23PB(1,SP)*((R23PA(1,SP)-R3)**2)
ENDIF
IF(R3.LT.R23PA(2,SP)) THEN
B2 = B2 + R23PB(2,SP)*((R23PA(2,SP)-R3)**2)
ENDIF
B2 = B2/(1.-(R3**2))
DIBCOR = B1 * (R1-1.)+B2*((R1**2)-1.)
IF(R1.LT.R23PA(1,SP)) THEN
DIBCOR = DIBCOR + R23PB(1,SP)*((R23PA(1,SP)-R1)**2)
ENDIF
IF (R1.LT.R23PA(2,SP)) THEN
DIBCOR = DIBCOR + R23PB(2,SP)*((R23PA(2,SP)-R1)**2)
ENDIF
DIBCOR = DIBCOR *(DBH**2)
C********************************************
C ABOVE A 6-INCH TOP LOGIC
C********************************************
IF(TOP6.LE.0.0) THEN
IF (DIBCOR.LE.0.0) THEN
D2=0.0
ELSE
D2=SQRT(DIBCOR)
ENDIF
ELSE
IF(HTUP.GE.TOP6) THEN
IF (D30IB.LT.6.0) THEN
C D2SQ = D30IB**2-(D30IB**2)*((HTUP-TOP6)/(HTTOT-TOP6))
C D2 = SQRT(D2SQ)
D2 = D30IB*((HTTOT-HTUP)/(HTTOT-TOP6))
ELSE
C D2SQ = 36.0 - (36.0*((HTUP-TOP6)/(HTTOT-TOP6)))
C D2 = SQRT(D2SQ)
D2 = 6.0*((HTTOT-HTUP)/(HTTOT-TOP6))
ENDIF
ELSE
D2 = SQRT(DIBCOR)
ENDIF
ENDIF
ENDIF
C*****************************************************************
C THIS IS THE END OF THE MAIN LOGIC
C*****************************************************************
RETURN
END