matlab_class/sample_processing/example_interp.m

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

%%%%%%%%%%%%%%%%%
%load grid:
%%%%%%%%%%%%%%%%%

gcmfaces_global;

if isempty(mygrid);
   grid_load;
end;

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

%%%%%%%%%%%%%%%%%%%%%%%
%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			%%%%%%%%%%%%%%%%%
5	gforget	1.14	%load grid:
6	gforget	1.1	%%%%%%%%%%%%%%%%%
7
8	gforget	1.12	gcmfaces_global;
9	gforget	1.13
10	gforget	1.15	if isempty(mygrid);
11			grid_load;
12			end;
13	gforget	1.12
14	gforget	1.14	if myenv.verbose>0;
15			gcmfaces_msg(['* call example_interp : will define ' ...
16			'a 2x2 gridded variable (an bathymetry field here), and then ' ...
17			'use interp2 to map it to the chosen grid. '],'');
18			end;
19	gforget	1.1
20			%%%%%%%%%%%%%%%%%%%%%%%
21	gforget	1.12	%get sample data: subsampled mygrid.Depth
22			if myenv.verbose>0;
23			gcmfaces_msg('* define test case : subsampled bathymetry');
24			end;
25			lon=mygrid.XC; lat=mygrid.YC;
26			original_Depth=mygrid.Depth;
27			original_Depth(original_Depth==0)=NaN;
28			%
29			[lon,lat,original_Depth]=convert2pcol(lon,lat,original_Depth);
30			nn=[62:239]; lon=lon(:,nn); lat=lat(:,nn);
31			original_Depth=original_Depth(:,nn);
32			[lon,lat]=meshgrid(lon(:,1),lat(1,:));
33			original_Depth=original_Depth';
34	gforget	1.1
35			%%%%%%%%%%%%%%%%%%%%%%%
36			%do the interpolation:
37
38	gforget	1.12	interp2_depth=gcmfaces(5);
39	gforget	1.8	for ii=1:mygrid.nFaces;
40	gforget	1.12	xi=mygrid.XC{ii}; yi=mygrid.YC{ii};
41			zi = interp2(lon,lat,original_Depth,xi,yi);
42			interp2_depth{ii}=zi;
43	gforget	1.1	end;
44
45			%%%%%%%%%%%%%%%%%%%%%%%
46			%illustrate the result:
47
48	gforget	1.12	figureL;
49			subplot(2,1,1); set(gca,'FontSize',14);
50			pcolor(lon,lat,original_Depth); axis([-180 180 -90 90]); shading flat;
51			title('input to interp2');
52			subplot(2,1,2); set(gca,'FontSize',14);
53			[X,Y,FLD]=convert2pcol(mygrid.XC,mygrid.YC,interp2_depth);
54			pcolor(X,Y,FLD); axis([-180 180 -90 90]); shading flat;
55			title('output of interp2');
56	gforget	1.1
57