matlab_class/sample_processing/example_bin_average.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;

%%%%%%%%%%%%%%%%%%%%%%%
%generate delaunay triangulation

XC=convert2array(mygrid.XC);
YC=convert2array(mygrid.YC);

%needed so that we do not loose data
XC(isnan(XC))=270;
YC(isnan(YC))=180;

TRI=delaunay(XC,YC);
nxy = prod(size(XC));
Stri=sparse(TRI(:,[1 1 2 2 3 3]),TRI(:,[2 3 1 3 1 2]),1,nxy,nxy);

%%%%%%%%%%%%%%%%%%%%%%%
%generate random data

nobs=1e6;
lat=(rand(nobs,1)-0.5)*2*90;
lon=(rand(nobs,1)-0.5)*2*180;  xx=find(lon>180);lon(xx)=lon(xx)-360;
obs=(rand(nobs,1)-0.5)*2;

%%%%%%%%%%%%%%%%%%%%%%%%
%bin average random data

OBS=0*XC; NOBS=OBS; 
ik=dsearch(XC,YC,TRI,lon,lat,Stri);
for k=1:length(ik)
        NOBS(ik(k))=NOBS(ik(k))+1;
        OBS(ik(k))=OBS(ik(k))+obs(k);
end  % k=1:length(ik)

in=find(NOBS); OBS(in)=OBS(in)./NOBS(in);
in=find(~NOBS); OBS(in)=NaN; NOBS(in)=NaN;

obsmap=convert2array(OBS,mygrid.XC);    %put in gcmfaces format
obsmapcompact=convert2gcmfaces(obsmap); %put in gcm input format

whos obs* OBS

figure; set(gcf,'Units','Normalized','Position',[0.1 0.3 0.4 0.6]);
imagescnan(OBS','nancolor',[1 1 1]*0.8); axis xy; caxis([-1 1]/2); colorbar;
figure; set(gcf,'Units','Normalized','Position',[0.5 0.3 0.4 0.6]);
imagescnan(NOBS','nancolor',[1 1 1]*0.8); axis xy; caxis([0 25]); colorbar;

%..... now illustrate the smoothing filter
test=input('illustrate smoothing filter? \n type 1 for yes or 0 for no\n');
if test; example_smooth; end;


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	1.3	dir0=[mydir 'matlab_class_material/'];
10	gforget	1.2	dirGrid=[dir0 'GRID' choiceV3orV4 '/'];
11			dirIn=[dir0 'SAMPLE' choiceV3orV4 '/'];
12			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			%generate delaunay triangulation
18
19			XC=convert2array(mygrid.XC);
20			YC=convert2array(mygrid.YC);
21
22			%needed so that we do not loose data
23			XC(isnan(XC))=270;
24			YC(isnan(YC))=180;
25
26			TRI=delaunay(XC,YC);
27			nxy = prod(size(XC));
28			Stri=sparse(TRI(:,[1 1 2 2 3 3]),TRI(:,[2 3 1 3 1 2]),1,nxy,nxy);
29
30			%%%%%%%%%%%%%%%%%%%%%%%
31			%generate random data
32
33			nobs=1e6;
34			lat=(rand(nobs,1)-0.5)290;
35			lon=(rand(nobs,1)-0.5)2180; xx=find(lon>180);lon(xx)=lon(xx)-360;
36			obs=(rand(nobs,1)-0.5)*2;
37
38			%%%%%%%%%%%%%%%%%%%%%%%%
39			%bin average random data
40
41			OBS=0*XC; NOBS=OBS;
42			ik=dsearch(XC,YC,TRI,lon,lat,Stri);
43			for k=1:length(ik)
44			NOBS(ik(k))=NOBS(ik(k))+1;
45			OBS(ik(k))=OBS(ik(k))+obs(k);
46			end % k=1:length(ik)
47
48			in=find(NOBS); OBS(in)=OBS(in)./NOBS(in);
49			in=find(~NOBS); OBS(in)=NaN; NOBS(in)=NaN;
50
51			obsmap=convert2array(OBS,mygrid.XC); %put in gcmfaces format
52			obsmapcompact=convert2gcmfaces(obsmap); %put in gcm input format
53
54			whos obs* OBS
55
56			figure; set(gcf,'Units','Normalized','Position',[0.1 0.3 0.4 0.6]);
57			imagescnan(OBS','nancolor',[1 1 1]*0.8); axis xy; caxis([-1 1]/2); colorbar;
58			figure; set(gcf,'Units','Normalized','Position',[0.5 0.3 0.4 0.6]);
59			imagescnan(NOBS','nancolor',[1 1 1]*0.8); axis xy; caxis([0 25]); colorbar;
60
61			%..... now illustrate the smoothing filter
62			test=input('illustrate smoothing filter? \n type 1 for yes or 0 for no\n');
63			if test; example_smooth; end;
64
65