!
!##################################################################
!##################################################################
!###### ######
!###### SUBROUTINE INTONEF ######
!###### ######
!###### Developed by ######
!###### Center for Analysis and Prediction of Storms ######
!###### University of Oklahoma ######
!###### ######
!##################################################################
!##################################################################
!
SUBROUTINE intonef(nx,ny,nz,vnx,vny,vnz, & 3,4
ibeg,iend,jbeg,jend,kbeg,kend, &
ivbeg,ivend,jvbeg,jvend,kvbeg,kvend, &
iorder, &
x2d,y2d,zp, vx,vy,vzp, &
vprt, vbar, aprt, abar, &
iloc,jloc,zpver,dxfld,dyfld,rdxfld,rdyfld, &
slopey,alphay,betay, &
ireturn )
!
!-----------------------------------------------------------------------
!
! PURPOSE:
! Intfield interpolates scalars from a single field (the verification
! fields, "verif") having Cartesian coordinates described by vx,vy,vzp
! to a second set of fields described by cartesion coordinates x,y,zp.
! It is assumed that x,y,zp and vx,vy,vzp are monotonically increasing
! with increasing index.
!
!-----------------------------------------------------------------------
!
! AUTHOR: Keith Brewster OU School of Meteorology. Feb 1992
!
! MODIFICATION HISTORY:
! 12 Aug 1992 (KB) changed from arps2.5 to arps3.0
! 19 May 1993 (KB) changed from arps3.1 to arps3.2
! 24 May 1993 (KB) changed to special version for scalars only.
!
! 9 Sep 1995 (KB) added processing of sfc (soil) fields
! 07 Nov 1996 (KB) changed interpolation scheme
! Reordered sequence of variables in call.
! 15 Oct 1999 (KB via Eric Kemp) corrected some dimension
! statements (no effect on results)
!
!-----------------------------------------------------------------------
!
! INPUT:
! nx Number grid pts in the x-direction (east/west)
! ny Number grid pts in the y-direction (north/south)
! nz Number grid pts in the vertical
!
! vnx Number grid pts in the x-direction (east/west)
! vny Number grid pts in the y-direction (north/south)
! vnz Number grid pts in the vertical
!
! ibeg,iend Range of x index to do interpolation
! jbeg,jend Range of y index to do interpolation
! kbeg,kend Range of z index to do interpolation
!
! ivbeg,ivend Range of x index to use in field to be interpolated
! jvbeg,jvend Range of y index to use in field to be interpolated
! kvbeg,kvend Range of z index to use in field to be interpolated
!
! iorder Interpolation parameter.
! iorder specifies the order of interpolation
! 1 = bi-linear
! 2 = bi-quadratic
!
! x2d x coordinate (m) of interpolation points
! y2d y coordinate (m) of interpolation points
! z z coordinate (m) of interpolation points
!
! vx x coordinate (m) of field to be interpolated
! vy y coordinate (m) of field to be interpolated
! zpver z coordinate (m) of field to be interpolated
!
! vprt perturbation variable to be interpolated
! vbar mean variable to be interpolated
!
! WORK ARRAYS:
! iloc I-index of interpolation points in field to be interpolated
! jloc J-index of interpolation points in field to be interpolated
! dxfld Vector of delta-x (m) of field to be interpolated
! dyfld Vector of delta-y (m) of field to be interpolated
! rdxfld Vector of 1./delta-x (1/m) of field to be interpolated
! rdyfld Vector of 1./delta-y (1/m) of field to be interpolated
!
! slopey Piecewise linear df/dy
! alphay Coefficient of y-squared term in y quadratic interpolator
! betay Coefficient of y term in y quadratic interpolator
!
! OUTPUT:
! aprt perturbation variable interpolated to ARPS grid
! abar mean variable interpolated to ARPS grid
!
!-----------------------------------------------------------------------
!
IMPLICIT NONE
INTEGER :: nx,ny,nz
INTEGER :: ibeg,iend,jbeg,jend,kbeg,kend
REAL :: x2d(nx,ny)
REAL :: y2d(nx,ny)
REAL :: zp(nx,ny,nz)
!
INTEGER :: vnx,vny,vnz
INTEGER :: ivbeg,ivend,jvbeg,jvend,kvbeg,kvend
REAL :: vx(vnx)
REAL :: vy(vny)
REAL :: vzp(vnx,vny,vnz)
!
INTEGER :: iorder
!
REAL :: vprt(vnx,vny,vnz)
REAL :: vbar(vnx,vny,vnz)
REAL :: aprt(nx,ny,nz)
REAL :: abar(nx,ny,nz)
!
INTEGER :: iloc(nx,ny)
INTEGER :: jloc(nx,ny)
REAL :: zpver(nx,ny,vnz)
!
REAL :: dxfld(vnx)
REAL :: dyfld(vny)
REAL :: rdxfld(vnx)
REAL :: rdyfld(vny)
REAL :: slopey(vnx,vny,vnz)
REAL :: alphay(vnx,vny,vnz)
REAL :: betay(vnx,vny,vnz)
!
INTEGER :: ireturn
!
!-----------------------------------------------------------------------
!
! Misc. local variables
!
!-----------------------------------------------------------------------
!
INTEGER :: k,korder
!
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
!
! Beginning of executable code...
!
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
!
!-----------------------------------------------------------------------
!
! Find i,j locations
!
!-----------------------------------------------------------------------
!
CALL setijloc
(nx,ny,vnx,vny,x2d,y2d,vx,vy,iloc,jloc)
!
!-----------------------------------------------------------------------
!
! Create array of verification heights at
! forecast x,y locations
!
!-----------------------------------------------------------------------
!
korder=MIN(iorder,2)
DO k=1,vnz-1
CALL fldint2d(nx,ny,vnx,vny, &
ibeg,iend,jbeg,jend, &
ivbeg,ivend,jvbeg,jvend, &
korder,x2d,y2d,vzp(1,1,k),vx,vy,iloc,jloc, &
dxfld,dyfld,rdxfld,rdyfld, &
slopey(1,1,k),alphay(1,1,k),betay(1,1,k), &
zpver(1,1,k))
END DO
!
!-----------------------------------------------------------------------
!
! Interpolate 3d fields
!
!-----------------------------------------------------------------------
!
CALL fldint3d(nx,ny,nz,vnx,vny,vnz, &
ibeg,iend,jbeg,jend,kbeg,kend, &
ivbeg,ivend,jvbeg,jvend,kvbeg,kvend, &
korder,x2d,y2d,zp,vprt,vx,vy,zpver,iloc,jloc, &
dxfld,dyfld,rdxfld,rdyfld, &
slopey,alphay,betay, &
aprt)
!
CALL fldint3d(nx,ny,nz,vnx,vny,vnz, &
ibeg,iend,jbeg,jend,kbeg,kend, &
ivbeg,ivend,jvbeg,jvend,kvbeg,kvend, &
korder,x2d,y2d,zp,vbar,vx,vy,zpver,iloc,jloc, &
dxfld,dyfld,rdxfld,rdyfld, &
slopey,alphay,betay, &
abar)
RETURN
END SUBROUTINE intonef
!
!##################################################################
!##################################################################
!###### ######
!###### SUBROUTINE FLDINT3D ######
!###### ######
!###### Developed by ######
!###### Center for Analysis and Prediction of Storms ######
!###### University of Oklahoma ######
!###### ######
!##################################################################
!##################################################################
!
SUBROUTINE fldint3d(nx,ny,nz,vnx,vny,vnz, & 21,1
ibeg,iend,jbeg,jend,kstart,kend, &
ivstart,ivend,jvstart,jvend,kvstart,kvend, &
iorder,x2d,y2d,z,var,vx,vy,zpver,iloc,jloc, &
dxfld,dyfld,rdxfld,rdyfld, &
slopey,alphay,betay, &
varint)
!
!-----------------------------------------------------------------------
!
! PURPOSE:
! Intfield interpolates scalars from a set of fields (the verification
! fields, "verif") having Cartesian coordinates described by vx,vy,vzp
! to a second set of fields described by cartesion coordinates x,y,zp.
! It is assumed that x,y,zp and vx,vy,vzp are monotonically increasing
! with increasing index.
!
!-----------------------------------------------------------------------
!
! AUTHOR: Keith Brewster OU School of Meteorology. Feb 1992
!
! MODIFICATION HISTORY:
! 12 Aug 1992 (KB) changed from arps2.5 to arps3.0
! 19 May 1993 (KB) changed from arps3.1 to arps3.2
! 24 May 1993 (KB) changed to special version for scalars only.
!
! 9 Sep 1995 (KB) added processing of sfc (soil) fields
! 26 Apr 1996 (KB) Version 2.0 -- Uses Gauss Forward routines for
! interpolation rather than piecewise linear.
! 07 Nov 1996 (KB) Changed interpolation scheme
!
!-----------------------------------------------------------------------
!
! INPUT:
! nx Number of model grid points in the x-direction (east/west)
! ny Number of model grid points in the y-direction (north/south)
! nz Number of model grid points in the vertical
!
! ibeg,iend Range of x index to do interpolation
! jbeg,jend Range of y index to do interpolation
! kbeg,kend Range of z index to do interpolation
!
! iorder Interpolation parameter.
! iorder specifies the order of interpolation
! 1 = bi-linear
! 2 = bi-quadratic
!
! x2d x coordinate (m) of interpolation points
! y2d y coordinate (m) of interpolation points
! z z coordinate (m) of interpolation points
!
! vx x coordinate (m) of field to be interpolated
! vy y coordinate (m) of field to be interpolated
! zpver z coordinate (m) of field to be interpolated
!
! iloc I-index of interpolation points in field to be interpolated
! jloc J-index of interpolation points in field to be interpolated
! dxfld Vector of delta-x (m) of field to be interpolated
! dyfld Vector of delta-y (m) of field to be interpolated
! rdxfld Vector of 1./delta-x (1/m) of field to be interpolated
! rdyfld Vector of 1./delta-y (1/m) of field to be interpolated
!
! WORK ARRAYS:
! slopey Piecewise linear df/dy
! alphay Coefficient of y-squared term in y quadratic interpolator
! betay Coefficient of y term in y quadratic interpolator
!
! OUTPUT:
! varint 3-d array of interpolated values
!
!-----------------------------------------------------------------------
!
IMPLICIT NONE
INTEGER :: nx,ny,nz
INTEGER :: vnx,vny,vnz
INTEGER :: ibeg,iend,jbeg,jend,kstart,kend
INTEGER :: ivstart,ivend,jvstart,jvend,kvstart,kvend
INTEGER :: iorder
REAL :: x2d(nx,ny)
REAL :: y2d(nx,ny)
REAL :: z(nx,ny,nz)
REAL :: var(vnx,vny,vnz)
REAL :: vx(vnx)
REAL :: vy(vny)
REAL :: zpver(nx,ny,vnz)
INTEGER :: iloc(nx,ny)
INTEGER :: jloc(nx,ny)
REAL :: dxfld(vnx)
REAL :: dyfld(vny)
REAL :: rdxfld(vnx)
REAL :: rdyfld(vny)
REAL :: slopey(vnx,vny,vnz)
REAL :: alphay(vnx,vny,vnz)
REAL :: betay(vnx,vny,vnz)
REAL :: varint(nx,ny,nz)
!
!-----------------------------------------------------------------------
!
! Misc. local variables
!
!-----------------------------------------------------------------------
!
INTEGER :: i,j,k,kv,kbot,ktop
REAL :: wtop,varbot,vartop
REAL :: pntint2d
!
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
!
! Beginning of executable code...
!
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
!
!-----------------------------------------------------------------------
!
! Compute derivative terms
!
!-----------------------------------------------------------------------
!
CALL setdrvy(vnx,vny,vnz, &
ivstart,ivend,jvstart,jvend,kvstart,kvend, &
dyfld,rdyfld,var, &
slopey,alphay,betay)
!
!-----------------------------------------------------------------------
!
! Compute interpolated values
!
!-----------------------------------------------------------------------
!
DO k=kstart,kend
DO j=jbeg,jend
DO i=ibeg,iend
!
!-----------------------------------------------------------------------
!
! Find location in second height array
! Assign linear weight
!
!-----------------------------------------------------------------------
!
DO kv=kvstart+1,kvend-1
IF(zpver(i,j,kv) > z(i,j,k)) EXIT
END DO
! 51 CONTINUE
ktop=kv
kbot=kv-1
wtop=(z(i,j,k)-zpver(i,j,kbot))/ &
(zpver(i,j,ktop)-zpver(i,j,kbot))
varbot=pntint2d(vnx,vny, &
ivstart,ivend,jvstart,jvend, &
iorder,vx,vy,x2d(i,j),y2d(i,j), &
iloc(i,j),jloc(i,j),var(1,1,kbot), &
dxfld,dyfld,rdxfld,rdyfld, &
slopey(1,1,kbot),alphay(1,1,kbot),betay(1,1,kbot))
vartop=pntint2d(vnx,vny, &
ivstart,ivend,jvstart,jvend, &
iorder,vx,vy,x2d(i,j),y2d(i,j), &
iloc(i,j),jloc(i,j),var(1,1,ktop), &
dxfld,dyfld,rdxfld,rdyfld, &
slopey(1,1,ktop),alphay(1,1,ktop),betay(1,1,ktop))
varint(i,j,k)=((1.-wtop)*varbot) + (wtop*vartop)
END DO
END DO
END DO
RETURN
END SUBROUTINE fldint3d
!
!##################################################################
!##################################################################
!###### ######
!###### SUBROUTINE FLDINT2D ######
!###### ######
!###### Developed by ######
!###### Center for Analysis and Prediction of Storms ######
!###### University of Oklahoma ######
!###### ######
!##################################################################
!##################################################################
!
SUBROUTINE fldint2d(nx,ny,vnx,vny, & 18,1
ibeg,iend,jbeg,jend, &
ivstart,ivend,jvstart,jvend, &
iorder,x2d,y2d,var,vx,vy,iloc,jloc, &
dxfld,dyfld,rdxfld,rdyfld, &
slopey,alphay,betay, &
varint)
!
!-----------------------------------------------------------------------
!
! PURPOSE:
! Interpolate a 2d field for several points 2-dimensions.
!
!-----------------------------------------------------------------------
!
! AUTHOR: Keith Brewster CAPS, November, 1996
!
! MODIFICATION HISTORY:
!
!-----------------------------------------------------------------------
!
! INPUT:
! nx Number of model grid points in the x-direction (east/west)
! ny Number of model grid points in the y-direction (north/south)
!
! vnx Number of verif grid points in the x-direction (east/west)
! vny Number of verif grid points in the y-direction (north/south)
!
! ibeg,iend Range of x index to do interpolation
! jbeg,jend Range of y index to do interpolation
! kbeg,kend Range of z index to do interpolation
!
! ivbeg,ivend Range of x index to use in verification array
! jvbeg,jvend Range of y index to use in verification array
! kvbeg,kvend Range of z index to use in verification array
!
! iorder Interpolation parameter.
! iorder specifies the order of interpolation
! 1 = bi-linear
! 2 = bi-quadratic
!
! x2d x coordinate (m) of interpolation points
! y2d y coordinate (m) of interpolation points
!
! var variable to be interpolated
!
! vx x coordinate (m) of field to be interpolated
! vy y coordinate (m) of field to be interpolated
!
! WORK ARRAYS:
! iloc I-index of interpolation points in field to be interpolated
! jloc J-index of interpolation points in field to be interpolated
! dxfld Vector of delta-x (m) of field to be interpolated
! dyfld Vector of delta-y (m) of field to be interpolated
! rdxfld Vector of 1./delta-x (1/m) of field to be interpolated
! rdyfld Vector of 1./delta-y (1/m) of field to be interpolated
!
! slopey Piecewise linear df/dy
! alphay Coefficient of y-squared term in y quadratic interpolator
! betay Coefficient of y term in y quadratic interpolator
!
! OUTPUT
! varint Interpolated data array
!
!-----------------------------------------------------------------------
!
! Variable declarations
!
!-----------------------------------------------------------------------
!
IMPLICIT NONE
INTEGER :: nx,ny
INTEGER :: vnx,vny
INTEGER :: ibeg,iend,jbeg,jend
INTEGER :: ivstart,ivend,jvstart,jvend
INTEGER :: iorder
REAL :: x2d(nx,ny)
REAL :: y2d(nx,ny)
REAL :: var(vnx,vny)
REAL :: vx(vnx)
REAL :: vy(vny)
INTEGER :: iloc(nx,ny)
INTEGER :: jloc(nx,ny)
REAL :: dxfld(vnx)
REAL :: dyfld(vny)
REAL :: rdxfld(vnx)
REAL :: rdyfld(vny)
REAL :: slopey(vnx,vny)
REAL :: alphay(vnx,vny)
REAL :: betay(vnx,vny)
REAL :: varint(nx,ny)
!
!-----------------------------------------------------------------------
!
! Misc. local variables
!
!-----------------------------------------------------------------------
!
INTEGER :: i,j,ii,jj
REAL :: delx,dely
REAL :: alpha,beta,rtwodx
REAL :: varm1,var00,varp1
!
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
!
! Beginning of executable code...
!
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
!
!-----------------------------------------------------------------------
!
! Compute y-derivative terms
!
!-----------------------------------------------------------------------
!
CALL setdrvy(vnx,vny,1, &
ivstart,ivend,jvstart,jvend,1,1, &
dyfld,rdyfld,var, &
slopey,alphay,betay)
!
!-----------------------------------------------------------------------
!
! Compute bilinear interpolated value
!
!-----------------------------------------------------------------------
!
IF(iorder == 1) THEN
DO j=jbeg,jend
DO i=ibeg,iend
ii=MIN(MAX(iloc(i,j),ivstart),(ivend-1))
jj=MIN(MAX(jloc(i,j),jvstart),(jvend-1))
delx=(x2d(i,j)-vx(ii))
dely=(y2d(i,j)-vy(jj))
varint(i,j)=(1.-delx*rdxfld(ii))* &
(var(ii ,jj)+slopey(ii ,jj)*dely)+ &
(delx*rdxfld(ii))* &
(var(ii+1,jj)+slopey(ii+1,jj)*dely)
END DO
END DO
!
!-----------------------------------------------------------------------
!
! Compute biquadratic
!
!-----------------------------------------------------------------------
!
ELSE
DO j=jbeg,jend
DO i=ibeg,iend
ii=MIN(MAX(iloc(i,j),(ivstart+1)),(ivend-1))
jj=MIN(MAX(jloc(i,j),(jvstart+1)),(jvend-1))
delx=(x2d(i,j)-vx(ii))
dely=(y2d(i,j)-vy(jj))
!
!-----------------------------------------------------------------------
!
! Stencil is ii-1 to ii+1 and jj-1 to jj + 1
!
! Interpolate in y.
!
!-----------------------------------------------------------------------
!
varm1=(alphay(ii-1,jj)*dely+betay(ii-1,jj))*dely+var(ii-1,jj)
var00=(alphay(ii ,jj)*dely+betay(ii ,jj))*dely+var(ii ,jj)
varp1=(alphay(ii+1,jj)*dely+betay(ii+1,jj))*dely+var(ii+1,jj)
!
!-----------------------------------------------------------------------
!
! Interpolate intermediate results in x.
!
!-----------------------------------------------------------------------
!
rtwodx=1./(dxfld(ii-1)+dxfld(ii))
alpha=((varp1-var00)*rdxfld(ii ) + &
(varm1-var00)*rdxfld(ii-1))*rtwodx
beta=(varp1-var00)*rdxfld(ii) - &
dxfld(ii)*alpha
varint(i,j)=(alpha*delx+beta)*delx+var00
END DO
END DO
END IF
RETURN
END SUBROUTINE fldint2d
!
!##################################################################
!##################################################################
!###### ######
!###### FUNCTION PNTINT2D ######
!###### ######
!###### Developed by ######
!###### Center for Analysis and Prediction of Storms ######
!###### University of Oklahoma ######
!###### ######
!##################################################################
!##################################################################
!
FUNCTION pntint2d(vnx,vny, &
ivbeg,ivend,jvbeg,jvend, &
iorder,vx,vy,xpnt,ypnt,iloc,jloc,var, &
dxfld,dyfld,rdxfld,rdyfld, &
slopey,alphay,betay)
!
!-----------------------------------------------------------------------
!
! PURPOSE:
!
! Interpolate a 2-d field for a single point on that plane.
!
!-----------------------------------------------------------------------
!
! AUTHOR: Keith Brewster, CAPS, November, 1996
!
! MODIFICATION HISTORY:
!
!-----------------------------------------------------------------------
!
! INPUT:
! vnx Number of model grid points in the x-direction (east/west)
! vny Number of model grid points in the y-direction (north/south)
!
! ivbeg,ivend Range of x index to use in verification array
! jvbeg,jvend Range of y index to use in verification array
!
! iorder Interpolation parameter.
! iorder specifies the order of interpolation
! 1 = bi-linear
! 2 = bi-quadratic
!
! vx x coordinate of verif scalar grid points in physical space (m)
! vy y coordinate of verif scalar grid points in physical space (m)
!
! xpnt x coordinate (m) of interpolation point
! ypnt y coordinate (m) of interpolation point
!
! iloc I-index of interpolation point in field to be interpolated
! jloc J-index of interpolation point in field to be interpolated
! dxfld Vector of delta-x (m) of field to be interpolated
! dyfld Vector of delta-y (m) of field to be interpolated
! rdxfld Vector of 1./delta-x (1/m) of field to be interpolated
! rdyfld Vector of 1./delta-y (1/m) of field to be interpolated
!
! slopey Piecewise linear df/dy
! alphay Coefficient of y-squared term in y quadratic interpolator
! betay Coefficient of y term in y quadratic interpolator
!
!-----------------------------------------------------------------------
!
IMPLICIT NONE
REAL :: pntint2d
INTEGER :: vnx,vny
INTEGER :: ivbeg,ivend,jvbeg,jvend
INTEGER :: iorder
REAL :: vx(vnx)
REAL :: vy(vny)
REAL :: xpnt
REAL :: ypnt
INTEGER :: iloc
INTEGER :: jloc
REAL :: var(vnx,vny)
REAL :: dxfld(vnx)
REAL :: dyfld(vny)
REAL :: rdxfld(vnx)
REAL :: rdyfld(vny)
REAL :: slopey(vnx,vny)
REAL :: alphay(vnx,vny)
REAL :: betay(vnx,vny)
!
!-----------------------------------------------------------------------
!
! Misc. local variables
!
!-----------------------------------------------------------------------
!
INTEGER :: ii,jj
REAL :: delx,dely
REAL :: alpha,beta,rtwodx
REAL :: varm1,var00,varp1
REAL :: varint
!
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
!
! Beginning of executable code...
!
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
!
!-----------------------------------------------------------------------
!
! Compute bilinear interpolated value
!
!-----------------------------------------------------------------------
!
IF(iorder == 1) THEN
ii=MIN(MAX(iloc,ivbeg),(ivend-1))
jj=MIN(MAX(jloc,jvbeg),(jvend-1))
delx=(xpnt-vx(ii))
dely=(ypnt-vy(jj))
varint=(1.-delx*rdxfld(ii))* &
(var(ii ,jj)+slopey(ii ,jj)*dely)+ &
(delx*rdxfld(ii))* &
(var(ii+1,jj)+slopey(ii+1,jj)*dely)
!
!-----------------------------------------------------------------------
!
! Compute biquadratic
!
!-----------------------------------------------------------------------
!
ELSE
ii=MIN(MAX(iloc,(ivbeg+1)),(ivend-1))
jj=MIN(MAX(jloc,(jvbeg+1)),(jvend-1))
delx=(xpnt-vx(ii))
dely=(ypnt-vy(jj))
!
!-----------------------------------------------------------------------
!
! Stencil is ii-1 to ii+1 and jj-1 to jj + 1
!
! Interpolate in y.
!
!-----------------------------------------------------------------------
!
varm1=(alphay(ii-1,jj)*dely+betay(ii-1,jj))*dely+var(ii-1,jj)
var00=(alphay(ii ,jj)*dely+betay(ii ,jj))*dely+var(ii ,jj)
varp1=(alphay(ii+1,jj)*dely+betay(ii+1,jj))*dely+var(ii+1,jj)
!
!-----------------------------------------------------------------------
!
! Interpolate intermediate results in x.
!
!-----------------------------------------------------------------------
!
rtwodx=1./(dxfld(ii-1)+dxfld(ii))
alpha=((varp1-var00)*rdxfld(ii ) + &
(varm1-var00)*rdxfld(ii-1))*rtwodx
beta=(varp1-var00)*rdxfld(ii) - &
dxfld(ii)*alpha
varint=(alpha*delx+beta)*delx+var00
END IF
pntint2d=varint
RETURN
END FUNCTION pntint2d
!
!##################################################################
!##################################################################
!###### ######
!###### SUBROUTINE SETIJLOC ######
!###### ######
!###### Developed by ######
!###### Center for Analysis and Prediction of Storms ######
!###### University of Oklahoma ######
!###### ######
!##################################################################
!##################################################################
!
SUBROUTINE setijloc(nx,ny,nx_ext,ny_ext, & 10
x2d,y2d,x_ext,y_ext,iloc,jloc)
!
!-----------------------------------------------------------------------
!
! PURPOSE:
! Find i,j indices in verfication grid of each forecast point
!
!-----------------------------------------------------------------------
!
! AUTHOR: Keith Brewster OU School of Meteorology. Feb 1992
!
! MODIFICATION HISTORY:
!
!-----------------------------------------------------------------------
!
! INPUT:
! nx Number of model grid points in the x-direction (east/west)
! ny Number of model grid points in the y-direction (north/south)
!
! nx_ext Number of external grid pts in the x-direction (east/west)
! ny_ext Number of external grid pts in the y-direction (north/south)
!
! x2d x coordinate (m) of interpolation points
! y2d y coordinate (m) of interpolation points
!
! x_ext x-coordinate (m) of external grid pts
! y_ext y-coordinate (m) of external grid pts
!
! OUTPUT:
!
! iloc i-index of interpolation points in field to be interpolated
! jloc j-index of interpolation points in field to be interpolated
!
!-----------------------------------------------------------------------
!
IMPLICIT NONE
INTEGER :: nx,ny,nx_ext,ny_ext
REAL :: x2d(nx,ny)
REAL :: y2d(nx,ny)
REAL :: x_ext(nx_ext)
REAL :: y_ext(ny_ext)
INTEGER :: iloc(nx,ny)
INTEGER :: jloc(nx,ny)
!
!-----------------------------------------------------------------------
!
! Misc. local variables
!
!-----------------------------------------------------------------------
!
INTEGER :: i,j,i_ext,j_ext
INTEGER :: imid,jmid
REAL :: xmid,ymid
!
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
!
! Beginning of executable code...
!
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
!
imid=nx_ext/2
xmid=x_ext(imid)
jmid=ny_ext/2
ymid=y_ext(jmid)
!
DO j=1,ny
DO i=1,nx
IF(x2d(i,j) < xmid) THEN
DO i_ext=imid,2,-1
IF(x_ext(i_ext) <= x2d(i,j)) EXIT
END DO
iloc(i,j)=i_ext
ELSE
DO i_ext=imid,nx_ext-1
IF(x_ext(i_ext) >= x2d(i,j)) EXIT
END DO
iloc(i,j)=i_ext-1
END IF
!
IF(y2d(i,j) < ymid) THEN
DO j_ext=jmid,2,-1
IF(y_ext(j_ext) <= y2d(i,j)) EXIT
END DO
jloc(i,j)=j_ext
ELSE
DO j_ext=jmid,ny_ext-1
IF(y_ext(j_ext) >= y2d(i,j)) EXIT
END DO
jloc(i,j)=j_ext-1
END IF
END DO
END DO
RETURN
END SUBROUTINE setijloc
!
!##################################################################
!##################################################################
!###### ######
!###### SUBROUTINE SETDXDY ######
!###### ######
!###### Developed by ######
!###### Center for Analysis and Prediction of Storms ######
!###### University of Oklahoma ######
!###### ######
!##################################################################
!##################################################################
!
SUBROUTINE setdxdy(nx,ny, & 12
ibeg,iend,jbeg,jend, &
x1d,y1d,dxfld,dyfld,rdxfld,rdyfld)
!
!-----------------------------------------------------------------------
!
! PURPOSE:
! Calculate the local delta-x, delta-y and their inverses.
! Precalculating these variables speeds up later calculations.
!
!-----------------------------------------------------------------------
!
! AUTHOR: Keith Brewster, CAPS, November, 1996
!
! MODIFICATION HISTORY:
!
!-----------------------------------------------------------------------
!
! INPUT:
! nx Number of model grid points in the x-direction (east/west)
! ny Number of model grid points in the y-direction (north/south)
!
! ibeg,iend Range of x index to do interpolation
! jbeg,jend Range of y index to do interpolation
!
! x1d Array of x-coordinate grid locations (m)
! y1d Array of y-coordinate grid locations (m)
!
! OUTPUT:
! dxfld Vector of delta-x (m) of field to be interpolated
! dyfld Vector of delta-y (m) of field to be interpolated
! rdxfld Vector of 1./delta-x (1/m) of field to be interpolated
! rdyfld Vector of 1./delta-y (1/m) of field to be interpolated
!
!-----------------------------------------------------------------------
!
IMPLICIT NONE
INTEGER :: nx,ny
INTEGER :: ibeg,iend
INTEGER :: jbeg,jend
REAL :: x1d(nx)
REAL :: y1d(ny)
REAL :: dxfld(nx)
REAL :: dyfld(ny)
REAL :: rdxfld(nx)
REAL :: rdyfld(ny)
!
!-----------------------------------------------------------------------
!
! Misc. local variables
!
!-----------------------------------------------------------------------
!
INTEGER :: i,j,istop,jstop
!
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
!
! Beginning of executable code...
!
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
!
istop=MIN((iend-1),(nx-1))
DO i=ibeg,istop
dxfld(i)=(x1d(i+1)-x1d(i))
rdxfld(i)=1./(x1d(i+1)-x1d(i))
END DO
jstop=MIN((jend-1),(ny-1))
DO j=jbeg,jstop
dyfld(j)=(y1d(j+1)-y1d(j))
rdyfld(j)=1./(y1d(j+1)-y1d(j))
END DO
RETURN
END SUBROUTINE setdxdy
!
!##################################################################
!##################################################################
!###### ######
!###### SUBROUTINE SETDRVY ######
!###### ######
!###### Developed by ######
!###### Center for Analysis and Prediction of Storms ######
!###### University of Oklahoma ######
!###### ######
!##################################################################
!##################################################################
!
SUBROUTINE setdrvy(nx,ny,nz, & 11
ibeg,iend,jbeg,jend,kbeg,kend, &
dyfld,rdyfld,var, &
slopey,alphay,betay)
!
!-----------------------------------------------------------------------
!
! PURPOSE:
! Calculate the coefficients of interpolating polynomials
! in the y-direction.
!
!-----------------------------------------------------------------------
!
! AUTHOR: Keith Brewster, CAPS, November, 1996
!
! MODIFICATION HISTORY:
!
!-----------------------------------------------------------------------
!
! INPUT:
! nx Number of model grid points in the x-direction (east/west)
! ny Number of model grid points in the y-direction (north/south)
! nz Number of model grid points in the vertical
!
! ibeg,iend Range of x index to do interpolation
! jbeg,jend Range of y index to do interpolation
! kbeg,kend Range of z index to do interpolation
!
! dyfld Vector of delta-y (m) of field to be interpolated
! rdyfld Vector of 1./delta-y (1/m) of field to be interpolated
!
! var variable to be interpolated
!
! slopey Piecewise linear df/dy
! alphay Coefficient of y-squared term in y quadratic interpolator
! betay Coefficient of y term in y quadratic interpolator
!
!-----------------------------------------------------------------------
!
IMPLICIT NONE
INTEGER :: nx,ny,nz
INTEGER :: ibeg,iend,jbeg,jend,kbeg,kend
REAL :: dyfld(ny)
REAL :: rdyfld(ny)
REAL :: var(nx,ny,nz)
REAL :: slopey(nx,ny,nz)
REAL :: alphay(nx,ny,nz)
REAL :: betay(nx,ny,nz)
!
!-----------------------------------------------------------------------
!
! Misc. local variables
!
!-----------------------------------------------------------------------
!
INTEGER :: i,j,k
INTEGER :: jstart,jstop
REAL :: rtwody
!
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
!
! Beginning of executable code...
!
!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
!
jstart=MAX(jbeg,2)
jstop=MIN((jend-1),(ny-2))
DO k=kbeg,kend
DO j=jstart,jstop
DO i=ibeg,iend
slopey(i,j,k)=(var(i,j+1,k)-var(i,j,k))*rdyfld(j)
rtwody=1./(dyfld(j-1)+dyfld(j))
alphay(i,j,k)=((var(i,j+1,k)-var(i,j,k))*rdyfld(j) + &
(var(i,j-1,k)-var(i,j,k))*rdyfld(j-1))*rtwody
betay(i,j,k)=(var(i,j+1,k)-var(i,j,k))*rdyfld(j) - &
dyfld(j)*alphay(i,j,k)
END DO
END DO
END DO
RETURN
END SUBROUTINE setdrvy