| 1 |
function [U,V,ub,vb] = uvcube2latlon(LON,LAT,u,v,xc,yc) |
| 2 |
% [ui,vi]=cube2latlon(x,y,u,v,xi,yi); |
| 3 |
% |
| 4 |
% Re-grids model output on expanded spherical cube to lat-lon grid. |
| 5 |
% x,y are 2-D arrays of the cell-centered coordinates |
| 6 |
% u,v is a 2-D or 3-D horizontal components of model flow fields. |
| 7 |
% xi,yi are vectors of the new regular lat-lon grid to interpolate to. |
| 8 |
% ui,vi are the flow fields with dimensions of size(xi) x size(yi) size(u,3). |
| 9 |
% |
| 10 |
% e.g. |
| 11 |
% >> x=rdmds('XC'); |
| 12 |
% >> y=rdmds('YC'); |
| 13 |
% >> u=rdmds('uVeltave.0000513360'); |
| 14 |
% >> v=rdmds('vVeltave.0000513360'); |
| 15 |
% >> xi=-179:2:180;yi=-89:2:90; |
| 16 |
% >> [ui,vi]=uvcube2latlon(x,y,u,v,xi,yi); |
| 17 |
% |
| 18 |
% $Header: /u/gcmpack/MITgcm/utils/matlab/uvcube2latlon.m,v 1.5 2004/06/04 17:03:50 adcroft Exp $ |
| 19 |
|
| 20 |
NN=size(u); |
| 21 |
[nnx ny nz]=size(u); |
| 22 |
|
| 23 |
U=reshape(u,[ny 6 ny nz]); |
| 24 |
V=reshape(v,[ny 6 ny nz]); |
| 25 |
|
| 26 |
uu=zeros(ny+1,6,ny,nz); |
| 27 |
vv=zeros(ny,6,ny+1,nz); |
| 28 |
|
| 29 |
for k=1:6; |
| 30 |
uu(1:ny,k,:,:)=U(:,k,:,:); |
| 31 |
vv(:,k,1:ny,:)=V(:,k,:,:); |
| 32 |
end |
| 33 |
|
| 34 |
for k=1:nz; |
| 35 |
uu(ny+1,1:2:6,:,k)=uu(1,2:2:6,:,k); |
| 36 |
uu(ny+1,2:2:6,:,k)=vv(ny:-1:1,[4:2:6 2:2:3],1,k)'; |
| 37 |
vv(:,2:2:6,ny+1,k)=vv(:,[3:2:6 1],1,k); |
| 38 |
vv(:,1:2:6,ny+1,k)=squeeze(uu(1,[3:2:6 1],ny:-1:1,k))'; |
| 39 |
end |
| 40 |
|
| 41 |
ub=(uu(1:ny,:,:,:)+uu(2:ny+1,:,:,:))/2; |
| 42 |
vb=(vv(:,:,1:ny,:)+vv(:,:,2:ny+1,:))/2; |
| 43 |
|
| 44 |
load TUV |
| 45 |
|
| 46 |
clear U V |
| 47 |
for kk=1:nz; |
| 48 |
for k=1:6; |
| 49 |
U(:,k,:,kk)=TUu(:,:,k).*squeeze(ub(:,k,:,kk))+TUv(:,:,k).*squeeze(vb(:,k,:,kk)); |
| 50 |
V(:,k,:,kk)=TVu(:,:,k).*squeeze(ub(:,k,:,kk))+TVv(:,:,k).*squeeze(vb(:,k,:,kk)); |
| 51 |
end |
| 52 |
end |
| 53 |
|
| 54 |
ub=reshape(U,[nnx NN(2:end)]); |
| 55 |
vb=reshape(V,[nnx NN(2:end)]); |
| 56 |
|
| 57 |
%U=cube2latlon(LON,LAT,U,xc,yc); |
| 58 |
%V=cube2latlon(LON,LAT,V,xc,yc); |
| 59 |
del=cube2latlon_preprocess(LON,LAT,xc,yc); |
| 60 |
U=cube2latlon_fast(del,ub); |
| 61 |
V=cube2latlon_fast(del,vb); |
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