| 1 |
#include "EXF_CPPOPTIONS.h" |
| 2 |
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
| 3 |
C Flux Coupler using C |
| 4 |
C Bilinear interpolation of forcing fields C |
| 5 |
C C |
| 6 |
C B. Cheng (12/2002) C |
| 7 |
C C |
| 8 |
C added Bicubic (bnc 1/2003) C |
| 9 |
C C |
| 10 |
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
| 11 |
|
| 12 |
real*8 function lagran(i,x,a) |
| 13 |
|
| 14 |
INTEGER i,k,sp |
| 15 |
_RS x |
| 16 |
real*8 a(4) |
| 17 |
real*8 numer,denom |
| 18 |
|
| 19 |
numer = 1.D0 |
| 20 |
denom = 1.D0 |
| 21 |
|
| 22 |
|
| 23 |
#ifdef BICUBIC |
| 24 |
sp = 4 |
| 25 |
#else |
| 26 |
sp = 2 |
| 27 |
#endif |
| 28 |
do k=1,sp |
| 29 |
if ( k .ne. i) then |
| 30 |
denom = denom*(a(i) - a(k)) |
| 31 |
numer = numer*(x - a(k)) |
| 32 |
endif |
| 33 |
enddo |
| 34 |
|
| 35 |
lagran = numer/denom |
| 36 |
|
| 37 |
return |
| 38 |
end |
| 39 |
|
| 40 |
|
| 41 |
SUBROUTINE exf_interp( |
| 42 |
I infile, |
| 43 |
I filePrec, |
| 44 |
O arrayout, |
| 45 |
I irecord, xG, yG, |
| 46 |
I lon_0,lon_inc, |
| 47 |
I lat_0,lat_inc, |
| 48 |
I nx_in,ny_in,mythid) |
| 49 |
|
| 50 |
C |
| 51 |
C *** infile = name of the input file (global binary, before interp.) |
| 52 |
C filePrec = file precicision |
| 53 |
C arrout = output arrays (different for each processor) |
| 54 |
C irecord = record number in global file |
| 55 |
C xG,yG = coordinates for output grid |
| 56 |
C lon_0, lat_0 = lon and lat of sw corner of global input grid |
| 57 |
C lon_inc = scalar x-grid increment |
| 58 |
C lat_inc = vector y-grid increments |
| 59 |
C nx_in, ny_in = input x-grid and y-grid size |
| 60 |
C |
| 61 |
|
| 62 |
#include "SIZE.h" |
| 63 |
#include "EEPARAMS.h" |
| 64 |
#include "EESUPPORT.h" |
| 65 |
#include "exf_param.h" |
| 66 |
|
| 67 |
C local variables |
| 68 |
|
| 69 |
integer ierr |
| 70 |
integer nx_in, ny_in |
| 71 |
integer irecord, filePrec |
| 72 |
_RL arrayout(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nsx,nsy) |
| 73 |
|
| 74 |
real*8 ne_fac,nw_fac,se_fac,sw_fac |
| 75 |
integer e_ind(snx),w_ind(snx) |
| 76 |
integer n_ind(sny),s_ind(sny) |
| 77 |
|
| 78 |
real*8 px_ind(4), py_ind(4) |
| 79 |
real*8 ew_val(4) |
| 80 |
external lagran |
| 81 |
real*8 lagran |
| 82 |
|
| 83 |
_RL lon_0,lon_inc |
| 84 |
_RL lat_0,lat_inc(ny_in-1) |
| 85 |
real*4 arrayin(-1:nx_in+2,-1:ny_in+2) |
| 86 |
real*8 x_in(-1:nx_in+2),y_in(-1:ny_in+2) |
| 87 |
|
| 88 |
_RS xG(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 89 |
_RS yG(1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
| 90 |
|
| 91 |
character*(*) infile |
| 92 |
integer i, j, k, l, js |
| 93 |
integer bi,bj,mythid |
| 94 |
integer interp_unit |
| 95 |
|
| 96 |
C read in input data |
| 97 |
|
| 98 |
call mdsfindunit( interp_unit, mythid) |
| 99 |
open(interp_unit,file=infile,status='old',access='direct', |
| 100 |
& recl=nx_in*ny_in*4) |
| 101 |
read(interp_unit,rec=irecord) ((arrayin(i,j),i=1,nx_in),j=1,ny_in) |
| 102 |
#ifdef _BYTESWAPIO |
| 103 |
call MDS_BYTESWAPR4((nx_in+4)*(ny_in+4), arrayin ) |
| 104 |
#endif |
| 105 |
close(interp_unit) |
| 106 |
|
| 107 |
C setup input grid |
| 108 |
|
| 109 |
do i=-1,nx_in+2 |
| 110 |
x_in(i) = lon_0 + (i-1.)*lon_inc |
| 111 |
enddo |
| 112 |
|
| 113 |
y_in(0) = lat_0 - lat_inc(1) |
| 114 |
y_in(-1)= lat_0 - 2.*lat_inc(1) |
| 115 |
|
| 116 |
y_in(1) = lat_0 |
| 117 |
do j=2,ny_in |
| 118 |
y_in(j) = y_in(j-1) + lat_inc(j-1) |
| 119 |
enddo |
| 120 |
|
| 121 |
y_in(ny_in+1) = y_in(ny_in) + lat_inc(ny_in-1) |
| 122 |
y_in(ny_in+2) = y_in(ny_in) + 2.*lat_inc(ny_in-1) |
| 123 |
|
| 124 |
C check validity of input/output parameters |
| 125 |
|
| 126 |
if ( xG(1,1) .le. x_in(0) .or. |
| 127 |
& xG(snx,1) .ge. x_in(nx_in+1) .or. |
| 128 |
& yG(1,1) .lt. y_in(1) .or. |
| 129 |
& yG(1,sny) .gt. y_in(ny_in) ) then |
| 130 |
print*,'ERROR in S/R EXF_INTERP:' |
| 131 |
print*,' input grid must encompass output grid.' |
| 132 |
STOP ' ABNORMAL END: S/R EXF_INTERP' |
| 133 |
endif |
| 134 |
|
| 135 |
C enlarge boundary |
| 136 |
|
| 137 |
do j=1,ny_in |
| 138 |
arrayin(0,j) = arrayin(nx_in,j) |
| 139 |
arrayin(-1,j) = arrayin(nx_in-1,j) |
| 140 |
arrayin(nx_in+1,j) = arrayin(1,j) |
| 141 |
arrayin(nx_in+2,j) = arrayin(2,j) |
| 142 |
enddo |
| 143 |
|
| 144 |
do i=-1,nx_in+2 |
| 145 |
arrayin(i,0) = arrayin(i,1) |
| 146 |
arrayin(i,-1) = arrayin(i,1) |
| 147 |
arrayin(i,ny_in+1) = arrayin(i,ny_in) |
| 148 |
arrayin(i,ny_in+2) = arrayin(i,ny_in) |
| 149 |
enddo |
| 150 |
|
| 151 |
C compute interpolation indices |
| 152 |
|
| 153 |
do i=1,snx |
| 154 |
if (xG(i,1)-x_in(1) .ge. 0.) then |
| 155 |
w_ind(i) = int((xG(i,1)-x_in(1))/lon_inc) + 1 |
| 156 |
else |
| 157 |
w_ind(i) = int((xG(i,1)-x_in(1))/lon_inc) |
| 158 |
endif |
| 159 |
e_ind(i) = w_ind(i) + 1 |
| 160 |
enddo |
| 161 |
|
| 162 |
js = ny_in/2 |
| 163 |
do j=1,sny |
| 164 |
do while (yG(1,j) .lt. y_in(js)) |
| 165 |
js = (js + 1)/2 |
| 166 |
enddo |
| 167 |
do while (yG(1,j) .ge. y_in(js+1)) |
| 168 |
js = js + 1 |
| 169 |
enddo |
| 170 |
s_ind(j) = js |
| 171 |
n_ind(j) = js + 1 |
| 172 |
enddo |
| 173 |
|
| 174 |
C interpolate |
| 175 |
|
| 176 |
do bj = mybylo(mythid), mybyhi(mythid) |
| 177 |
do bi = mybxlo(mythid), mybxhi(mythid) |
| 178 |
|
| 179 |
#ifdef BICUBIC |
| 180 |
do j=1,sny |
| 181 |
do i=1,snx |
| 182 |
|
| 183 |
arrayout(i,j,bi,bj) = 0. |
| 184 |
|
| 185 |
do l=-1,2 |
| 186 |
px_ind(l+2) = x_in(w_ind(i)+l) |
| 187 |
py_ind(l+2) = y_in(s_ind(j)+l) |
| 188 |
enddo |
| 189 |
|
| 190 |
do k=1,4 |
| 191 |
ew_val(k) = |
| 192 |
& arrayin(w_ind(i)-1,s_ind(j)+k-2)*lagran(1,xG(i,1),px_ind) |
| 193 |
& + arrayin(w_ind(i) ,s_ind(j)+k-2)*lagran(2,xG(i,1),px_ind) |
| 194 |
& + arrayin(e_ind(i) ,s_ind(j)+k-2)*lagran(3,xG(i,1),px_ind) |
| 195 |
& + arrayin(e_ind(i)+1,s_ind(j)+k-2)*lagran(4,xG(i,1),px_ind) |
| 196 |
arrayout(i,j,bi,bj)=arrayout(i,j,bi,bj) |
| 197 |
& + ew_val(k)*lagran(k,yG(1,j),py_ind) |
| 198 |
enddo |
| 199 |
|
| 200 |
enddo |
| 201 |
enddo |
| 202 |
#else |
| 203 |
do j=1,sny |
| 204 |
do i=1,snx |
| 205 |
|
| 206 |
arrayout(i,j,bi,bj) = 0. |
| 207 |
|
| 208 |
do l=0,1 |
| 209 |
px_ind(l+1) = x_in(w_ind(i)+l) |
| 210 |
py_ind(l+1) = y_in(s_ind(j)+l) |
| 211 |
enddo |
| 212 |
|
| 213 |
do k=1,2 |
| 214 |
ew_val(k) = |
| 215 |
& arrayin(w_ind(i),s_ind(j)+k-1)*lagran(1,xG(i,1),px_ind) |
| 216 |
& + arrayin(e_ind(i),s_ind(j)+k-1)*lagran(2,xG(i,1),px_ind) |
| 217 |
|
| 218 |
arrayout(i,j,bi,bj)=arrayout(i,j,bi,bj) |
| 219 |
& + ew_val(k)*lagran(k,yG(1,j),py_ind) |
| 220 |
enddo |
| 221 |
|
| 222 |
enddo |
| 223 |
enddo |
| 224 |
#endif |
| 225 |
enddo |
| 226 |
enddo |
| 227 |
|
| 228 |
END |
| 229 |
C *** |
Parent Directory
| 
Revision Log
| 
Revision Graph