| 1 |
#include "EXF_OPTIONS.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,sp) |
| 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 |
do k=1,sp |
| 23 |
if ( k .ne. i) then |
| 24 |
denom = denom*(a(i) - a(k)) |
| 25 |
numer = numer*(x - a(k)) |
| 26 |
endif |
| 27 |
enddo |
| 28 |
|
| 29 |
lagran = numer/denom |
| 30 |
|
| 31 |
return |
| 32 |
end |
| 33 |
|
| 34 |
|
| 35 |
SUBROUTINE exf_interp( |
| 36 |
I infile, |
| 37 |
I filePrec, |
| 38 |
O arrayout, |
| 39 |
I irecord, xG_in, yG, |
| 40 |
I lon_0, lon_inc, |
| 41 |
I lat_0, lat_inc, |
| 42 |
I nx_in, ny_in, method, mythid) |
| 43 |
|
| 44 |
implicit none |
| 45 |
|
| 46 |
C infile = name of the input file (direct access binary) |
| 47 |
C filePrec = file precicision (currently not used, assumes real*4) |
| 48 |
C arrout = output arrays (different for each processor) |
| 49 |
C irecord = record number in global file |
| 50 |
C xG,yG = coordinates for output grid |
| 51 |
C lon_0, lat_0 = lon and lat of sw corner of global input grid |
| 52 |
C lon_inc = scalar x-grid increment |
| 53 |
C lat_inc = vector y-grid increments |
| 54 |
C nx_in, ny_in = input x-grid and y-grid size |
| 55 |
C method = 1 for bilinear 2 for bicubic |
| 56 |
C mythid = thread id |
| 57 |
C |
| 58 |
|
| 59 |
#include "SIZE.h" |
| 60 |
#include "EEPARAMS.h" |
| 61 |
#include "PARAMS.h" |
| 62 |
|
| 63 |
C subroutine variables |
| 64 |
character*(*) infile |
| 65 |
integer filePrec, irecord, nx_in, ny_in |
| 66 |
_RL arrayout(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
| 67 |
_RS xG_in (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
| 68 |
_RS yG (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
| 69 |
_RL lon_0, lon_inc |
| 70 |
_RL lat_0, lat_inc(ny_in-1) |
| 71 |
integer method, mythid |
| 72 |
|
| 73 |
C local variables |
| 74 |
real*8 ne_fac,nw_fac,se_fac,sw_fac |
| 75 |
integer e_ind(snx,sny),w_ind(snx,sny) |
| 76 |
integer n_ind(snx,sny),s_ind(snx,sny) |
| 77 |
real*8 px_ind(4), py_ind(4), ew_val(4) |
| 78 |
external lagran |
| 79 |
real*8 lagran |
| 80 |
real*4 arrayin(-1:nx_in+2 , -1:ny_in+2) |
| 81 |
real*8 x_in (-1:nx_in+2), y_in(-1:ny_in+2) |
| 82 |
integer i, j, k, l, js, bi, bj, sp, interp_unit |
| 83 |
_RS xG(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
| 84 |
_RS threeSixtyRS |
| 85 |
_RL threeSixtyRL |
| 86 |
PARAMETER ( threeSixtyRS = 360. ) |
| 87 |
PARAMETER ( threeSixtyRL = 360. ) |
| 88 |
|
| 89 |
! nomalize xG |
| 90 |
do bj=myByLo(myThid),myByHi(myThid) |
| 91 |
do bi=myBxLo(myThid),myBxHi(myThid) |
| 92 |
do j=1-OLy,sNy+OLy |
| 93 |
do i=1-OLx,sNx+OLx |
| 94 |
xG(i,j,bi,bj) = xG_in(i,j,bi,bj) |
| 95 |
xG(i,j,bi,bj) = mod(xG(i,j,bi,bj),threeSixtyRS) |
| 96 |
if ( xG(i,j,bi,bj) .lt. 0. ) |
| 97 |
& xG(i,j,bi,bj) = threeSixtyRS+xG(i,j,bi,bj) |
| 98 |
enddo |
| 99 |
enddo |
| 100 |
enddo |
| 101 |
enddo |
| 102 |
|
| 103 |
call exf_interp_read( |
| 104 |
I infile, |
| 105 |
I filePrec, |
| 106 |
O arrayin, |
| 107 |
I irecord, xG, yG, |
| 108 |
I lon_0, lon_inc, |
| 109 |
I lat_0, lat_inc, |
| 110 |
I nx_in, ny_in, method, mythid) |
| 111 |
_BARRIER |
| 112 |
|
| 113 |
C _BEGIN_MASTER( myThid ) |
| 114 |
|
| 115 |
C setup input grid |
| 116 |
do i=-1,nx_in+2 |
| 117 |
x_in(i) = lon_0 + (i-1.)*lon_inc |
| 118 |
x_in(i) = mod(x_in(i),threeSixtyRL) |
| 119 |
if ( x_in(i) .lt. 0. ) |
| 120 |
& x_in(i) = threeSixtyRL+x_in(i) |
| 121 |
enddo |
| 122 |
|
| 123 |
y_in(0) = lat_0 - lat_inc(1) |
| 124 |
y_in(-1)= lat_0 - 2.*lat_inc(1) |
| 125 |
y_in(1) = lat_0 |
| 126 |
do j=2,ny_in |
| 127 |
y_in(j) = y_in(j-1) + lat_inc(j-1) |
| 128 |
enddo |
| 129 |
y_in(ny_in+1) = y_in(ny_in) + lat_inc(ny_in-1) |
| 130 |
y_in(ny_in+2) = y_in(ny_in) + 2.*lat_inc(ny_in-1) |
| 131 |
|
| 132 |
C enlarge boundary |
| 133 |
do j=1,ny_in |
| 134 |
arrayin(0,j) = arrayin(nx_in,j) |
| 135 |
arrayin(-1,j) = arrayin(nx_in-1,j) |
| 136 |
arrayin(nx_in+1,j) = arrayin(1,j) |
| 137 |
arrayin(nx_in+2,j) = arrayin(2,j) |
| 138 |
enddo |
| 139 |
do i=-1,nx_in+2 |
| 140 |
arrayin(i,0) = arrayin(i,1) |
| 141 |
arrayin(i,-1) = arrayin(i,1) |
| 142 |
arrayin(i,ny_in+1) = arrayin(i,ny_in) |
| 143 |
arrayin(i,ny_in+2) = arrayin(i,ny_in) |
| 144 |
enddo |
| 145 |
|
| 146 |
C _END_MASTER( myThid ) |
| 147 |
|
| 148 |
do bj = mybylo(mythid), mybyhi(mythid) |
| 149 |
do bi = mybxlo(mythid), mybxhi(mythid) |
| 150 |
|
| 151 |
C check validity of input/output coordinates |
| 152 |
#ifdef ALLOW_DEBUG |
| 153 |
if ( debugLevel .ge. debLevB ) then |
| 154 |
do i=1,snx |
| 155 |
do j=1,sny |
| 156 |
if ( xG(i,j,bi,bj) .lt. x_in(0) .or. |
| 157 |
& xG(i,j,bi,bj) .ge. x_in(nx_in+1) .or. |
| 158 |
& yG(i,j,bi,bj) .lt. y_in(0) .or. |
| 159 |
& yG(i,j,bi,bj) .ge. y_in(ny_in+1) ) then |
| 160 |
print*,'ERROR in S/R EXF_INTERP:' |
| 161 |
print*,' input grid must encompass output grid.' |
| 162 |
print*,'i,j,bi,bj' ,i,j,bi,bj |
| 163 |
print*,'xG,yG' ,xG(i,j,bi,bj),yG(i,j,bi,bj) |
| 164 |
print*,'nx_in,ny_in' ,nx_in ,ny_in |
| 165 |
print*,'x_in(0,nx_in+1)',x_in(0) ,x_in(nx_in+1) |
| 166 |
print*,'y_in(0,ny_in+1)',y_in(0) ,y_in(ny_in+1) |
| 167 |
STOP ' ABNORMAL END: S/R EXF_INTERP' |
| 168 |
endif |
| 169 |
enddo |
| 170 |
enddo |
| 171 |
endif |
| 172 |
#endif /* ALLOW_DEBUG */ |
| 173 |
|
| 174 |
C compute interpolation indices |
| 175 |
do i=1,snx |
| 176 |
do j=1,sny |
| 177 |
if (xG(i,j,bi,bj)-x_in(1) .ge. 0.) then |
| 178 |
w_ind(i,j) = int((xG(i,j,bi,bj)-x_in(1))/lon_inc) + 1 |
| 179 |
else |
| 180 |
w_ind(i,j) = int((xG(i,j,bi,bj)-x_in(1))/lon_inc) |
| 181 |
endif |
| 182 |
e_ind(i,j) = w_ind(i,j) + 1 |
| 183 |
js = ny_in*.5 |
| 184 |
do while (yG(i,j,bi,bj) .lt. y_in(js)) |
| 185 |
js = (js - 1)*.5 |
| 186 |
enddo |
| 187 |
do while (yG(i,j,bi,bj) .ge. y_in(js+1)) |
| 188 |
js = js + 1 |
| 189 |
enddo |
| 190 |
s_ind(i,j) = js |
| 191 |
n_ind(i,j) = js + 1 |
| 192 |
enddo |
| 193 |
enddo |
| 194 |
|
| 195 |
if (method .eq. 1) then |
| 196 |
|
| 197 |
C bilinear interpolation |
| 198 |
sp = 2 |
| 199 |
do j=1,sny |
| 200 |
do i=1,snx |
| 201 |
arrayout(i,j,bi,bj) = 0. |
| 202 |
do l=0,1 |
| 203 |
px_ind(l+1) = x_in(w_ind(i,j)+l) |
| 204 |
py_ind(l+1) = y_in(s_ind(i,j)+l) |
| 205 |
enddo |
| 206 |
do k=1,2 |
| 207 |
ew_val(k) = arrayin(w_ind(i,j),s_ind(i,j)+k-1) |
| 208 |
& *lagran(1,xG(i,j,bi,bj),px_ind,sp) |
| 209 |
& +arrayin(e_ind(i,j),s_ind(i,j)+k-1) |
| 210 |
& *lagran(2,xG(i,j,bi,bj),px_ind,sp) |
| 211 |
arrayout(i,j,bi,bj)=arrayout(i,j,bi,bj) |
| 212 |
& +ew_val(k)*lagran(k,yG(i,j,bi,bj),py_ind,sp) |
| 213 |
enddo |
| 214 |
enddo |
| 215 |
enddo |
| 216 |
elseif (method .eq. 2) then |
| 217 |
|
| 218 |
C bicubic interpolation |
| 219 |
sp = 4 |
| 220 |
do j=1,sny |
| 221 |
do i=1,snx |
| 222 |
arrayout(i,j,bi,bj) = 0. |
| 223 |
do l=-1,2 |
| 224 |
px_ind(l+2) = x_in(w_ind(i,j)+l) |
| 225 |
py_ind(l+2) = y_in(s_ind(i,j)+l) |
| 226 |
enddo |
| 227 |
do k=1,4 |
| 228 |
ew_val(k) = |
| 229 |
& arrayin(w_ind(i,j)-1,s_ind(i,j)+k-2) |
| 230 |
& *lagran(1,xG(i,j,bi,bj),px_ind,sp) |
| 231 |
& +arrayin(w_ind(i,j) ,s_ind(i,j)+k-2) |
| 232 |
& *lagran(2,xG(i,j,bi,bj),px_ind,sp) |
| 233 |
& +arrayin(e_ind(i,j) ,s_ind(i,j)+k-2) |
| 234 |
& *lagran(3,xG(i,j,bi,bj),px_ind,sp) |
| 235 |
& +arrayin(e_ind(i,j)+1,s_ind(i,j)+k-2) |
| 236 |
& *lagran(4,xG(i,j,bi,bj),px_ind,sp) |
| 237 |
arrayout(i,j,bi,bj)=arrayout(i,j,bi,bj) |
| 238 |
& +ew_val(k)*lagran(k,yG(i,j,bi,bj),py_ind,sp) |
| 239 |
enddo |
| 240 |
enddo |
| 241 |
enddo |
| 242 |
else |
| 243 |
stop 'stop in exf_interp.F: interpolation method not supported' |
| 244 |
endif |
| 245 |
enddo |
| 246 |
enddo |
| 247 |
|
| 248 |
END |
Parent Directory
| 
Revision Log
| 
Revision Graph