matlab_class/sample_processing/example_interp.m

function []=example_interp();
%object:    a interp2 example within gcmfaces

gcmfaces_global;
if myenv.verbose>0;
    gcmfaces_msg(['* call example_interp : will define ' ...
        'a 2x2 gridded variable (an SSH field here), and then ' ...
        'use interp2 to map it to the chosen grid. '],'');
end;

%%%%%%%%%%%%%%%%%
%load parameters:
%%%%%%%%%%%%%%%%%

gcmfaces_global;

nF=5;
fileFormat='compact';
dirGrid=fullfile(myenv.gcmfaces_dir,'..',filesep,'GRID',filesep);

mygrid=[]; grid_load(dirGrid,nF,fileFormat,1);

%%%%%%%%%%%%%%%%%%%%%%%
%get sample data: subsampled mygrid.Depth
if myenv.verbose>0;
    gcmfaces_msg('* define test case : subsampled bathymetry');
end;
lon=mygrid.XC; lat=mygrid.YC;
original_Depth=mygrid.Depth;
original_Depth(original_Depth==0)=NaN;
%
[lon,lat,original_Depth]=convert2pcol(lon,lat,original_Depth);
nn=[62:239]; lon=lon(:,nn); lat=lat(:,nn);
original_Depth=original_Depth(:,nn);
[lon,lat]=meshgrid(lon(:,1),lat(1,:));
original_Depth=original_Depth';

%%%%%%%%%%%%%%%%%%%%%%%
%do the interpolation:

interp2_depth=gcmfaces(5);
for ii=1:mygrid.nFaces;
    xi=mygrid.XC{ii}; yi=mygrid.YC{ii};
    zi = interp2(lon,lat,original_Depth,xi,yi);
    interp2_depth{ii}=zi;
end;

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

figureL;
subplot(2,1,1); set(gca,'FontSize',14);
pcolor(lon,lat,original_Depth); axis([-180 180 -90 90]); shading flat;
title('input to interp2');
subplot(2,1,2); set(gca,'FontSize',14);
[X,Y,FLD]=convert2pcol(mygrid.XC,mygrid.YC,interp2_depth);
pcolor(X,Y,FLD); axis([-180 180 -90 90]); shading flat;
title('output of interp2');


1	gforget	1.13	function []=example_interp();
2	gforget	1.8	%object: a interp2 example within gcmfaces
3	gforget	1.1
4	gforget	1.11	gcmfaces_global;
5			if myenv.verbose>0;
6			gcmfaces_msg(['* call example_interp : will define ' ...
7			'a 2x2 gridded variable (an SSH field here), and then ' ...
8			'use interp2 to map it to the chosen grid. '],'');
9			end;
10
11	gforget	1.1	%%%%%%%%%%%%%%%%%
12			%load parameters:
13			%%%%%%%%%%%%%%%%%
14
15	gforget	1.12	gcmfaces_global;
16	gforget	1.13
17			nF=5;
18			fileFormat='compact';
19			dirGrid=fullfile(myenv.gcmfaces_dir,'..',filesep,'GRID',filesep);
20	gforget	1.12
21			mygrid=[]; grid_load(dirGrid,nF,fileFormat,1);
22	gforget	1.1
23			%%%%%%%%%%%%%%%%%%%%%%%
24	gforget	1.12	%get sample data: subsampled mygrid.Depth
25			if myenv.verbose>0;
26			gcmfaces_msg('* define test case : subsampled bathymetry');
27			end;
28			lon=mygrid.XC; lat=mygrid.YC;
29			original_Depth=mygrid.Depth;
30			original_Depth(original_Depth==0)=NaN;
31			%
32			[lon,lat,original_Depth]=convert2pcol(lon,lat,original_Depth);
33			nn=[62:239]; lon=lon(:,nn); lat=lat(:,nn);
34			original_Depth=original_Depth(:,nn);
35			[lon,lat]=meshgrid(lon(:,1),lat(1,:));
36			original_Depth=original_Depth';
37	gforget	1.1
38			%%%%%%%%%%%%%%%%%%%%%%%
39			%do the interpolation:
40
41	gforget	1.12	interp2_depth=gcmfaces(5);
42	gforget	1.8	for ii=1:mygrid.nFaces;
43	gforget	1.12	xi=mygrid.XC{ii}; yi=mygrid.YC{ii};
44			zi = interp2(lon,lat,original_Depth,xi,yi);
45			interp2_depth{ii}=zi;
46	gforget	1.1	end;
47
48			%%%%%%%%%%%%%%%%%%%%%%%
49			%illustrate the result:
50
51	gforget	1.12	figureL;
52			subplot(2,1,1); set(gca,'FontSize',14);
53			pcolor(lon,lat,original_Depth); axis([-180 180 -90 90]); shading flat;
54			title('input to interp2');
55			subplot(2,1,2); set(gca,'FontSize',14);
56			[X,Y,FLD]=convert2pcol(mygrid.XC,mygrid.YC,interp2_depth);
57			pcolor(X,Y,FLD); axis([-180 180 -90 90]); shading flat;
58			title('output of interp2');
59	gforget	1.1
60