matlab_class/sample_processing/example_griddata.m


%%%%%%%%%%%%%%%%%
%load parameters:
%%%%%%%%%%%%%%%%%
choiceV3orV4='v4'

if ~isempty(choiceV3orV4)&isempty(whos('mygrid'));
  gcmfaces_path;
  dir0=[mydir '/matlab_class_material/'];
  dirGrid=[dir0 '/GRID' choiceV3orV4  '/'];
  dirIn=[dir0 '/SAMPLE' choiceV3orV4  '/'];
  if strcmp(choiceV3orV4,'v4'); nF=5; else; nF=1; end;
  global mygrid; mygrid=[]; grid_load(dirGrid,nF);
end;

%%%%%%%%%%%%%%%%%%%%%%%
%get sample data: V3 SSH
dirV3=[mydir '/matlab_class_material/SAMPLEv3/'];
etan=rdmds([dirV3 'DDetan'],0); etan(etan==0)=NaN;
dirV3=[mydir '/matlab_class_material/GRIDv3/'];
lon=rdmds([dirV3 'XC']); lat=rdmds([dirV3 'YC']);

%%%%%%%%%%%%%%%%%%%%%%%
%do the interpolation:
x=[lon-360;lon]; y=[lat;lat]; z=[etan;etan];
jj=find(~isnan(z)); x=x(jj); y=y(jj); z=z(jj);

z_interp=gcmfaces(5);
for ii=1:5;
xi=mygrid.XC{ii}; yi=mygrid.YC{ii};
zi = griddata(x',y',z',xi,yi);
z_interp{ii}=zi;
end;

fprintf('note that griddata puts values in remote places ... \n');
fprintf('so one should obviously be cautious when using this routine\n');
%msk=mygrid.hFacC(:,:,1); z_interp(find(msk==0))=NaN;

%%%%%%%%%%%%%%%%%%%%%%%
%illustrate the result:

figure; set(gcf,'Units','Normalized','Position',[0.1 0.1 0.4 0.6]);
x=[lon-360;lon]; y=[lat;lat]; z=[etan;etan];
pcolor(x,y,z); axis([-180 180 -90 90]); shading flat; caxis([-2 1]); colorbar;

figure; set(gcf,'Units','Normalized','Position',[0.5 0.1 0.4 0.6]);
[X,Y,FLD]=convert2pcol(mygrid.XC,mygrid.YC,z_interp);
pcolor(X,Y,FLD); axis([-180 180 -90 90]); shading flat; caxis([-2 1]); colorbar;

pause;

1	gforget	1.1
2			%%%%%%%%%%%%%%%%%
3			%load parameters:
4			%%%%%%%%%%%%%%%%%
5			choiceV3orV4='v4'
6
7	gforget	1.2	if ~isempty(choiceV3orV4)&isempty(whos('mygrid'));
8	gforget	1.1	gcmfaces_path;
9	gforget	1.4	dir0=[mydir '/matlab_class_material/'];
10			dirGrid=[dir0 '/GRID' choiceV3orV4 '/'];
11			dirIn=[dir0 '/SAMPLE' choiceV3orV4 '/'];
12	gforget	1.2	if strcmp(choiceV3orV4,'v4'); nF=5; else; nF=1; end;
13			global mygrid; mygrid=[]; grid_load(dirGrid,nF);
14	gforget	1.1	end;
15
16			%%%%%%%%%%%%%%%%%%%%%%%
17	gforget	1.2	%get sample data: V3 SSH
18	gforget	1.4	dirV3=[mydir '/matlab_class_material/SAMPLEv3/'];
19	gforget	1.2	etan=rdmds([dirV3 'DDetan'],0); etan(etan==0)=NaN;
20	gforget	1.4	dirV3=[mydir '/matlab_class_material/GRIDv3/'];
21	gforget	1.2	lon=rdmds([dirV3 'XC']); lat=rdmds([dirV3 'YC']);
22	gforget	1.1
23			%%%%%%%%%%%%%%%%%%%%%%%
24			%do the interpolation:
25			x=[lon-360;lon]; y=[lat;lat]; z=[etan;etan];
26			jj=find(~isnan(z)); x=x(jj); y=y(jj); z=z(jj);
27
28			z_interp=gcmfaces(5);
29			for ii=1:5;
30			xi=mygrid.XC{ii}; yi=mygrid.YC{ii};
31			zi = griddata(x',y',z',xi,yi);
32			z_interp{ii}=zi;
33			end;
34
35			fprintf('note that griddata puts values in remote places ... \n');
36			fprintf('so one should obviously be cautious when using this routine\n');
37			%msk=mygrid.hFacC(:,:,1); z_interp(find(msk==0))=NaN;
38
39			%%%%%%%%%%%%%%%%%%%%%%%
40			%illustrate the result:
41
42			figure; set(gcf,'Units','Normalized','Position',[0.1 0.1 0.4 0.6]);
43			x=[lon-360;lon]; y=[lat;lat]; z=[etan;etan];
44			pcolor(x,y,z); axis([-180 180 -90 90]); shading flat; caxis([-2 1]); colorbar;
45
46			figure; set(gcf,'Units','Normalized','Position',[0.5 0.1 0.4 0.6]);
47			[X,Y,FLD]=convert2pcol(mygrid.XC,mygrid.YC,z_interp);
48			pcolor(X,Y,FLD); axis([-180 180 -90 90]); shading flat; caxis([-2 1]); colorbar;
49
50			pause;
51