matlab_class/gcmfaces_IO/grid_load.m

function []=grid_load(dirGrid,nFaces,fileFormat,memoryLimit,omitNativeGrid);
%object:    load grid information, convert it to gcmfaces format
%           and encapsulate it in the global mygrid structure.
%inputs:    dirGrid is the directory where the grid files (gcm output) can be found.
%           nFaces is the number of faces in this gcm set-up of current interest.
%           fileFormat is the file format ('straight','cube','compact')
%optional:  memoryLimit is a flag that allows the user to omit secondary
%               grid fields in case memory/storage become an issue. It
%               takes 3 values : (0; the default) includes everything
%               (1) omits all 3D fields but hFacC (2) only loads XC & YC.
%           omitNativeGrid is a flag (0 by default) to bypass (when flag 1)
%               grid_load_native and grid_load_native_RAZ calls (that can
%               complement mygrid based upon e.g. tile*.mitgrid files)

if isempty(whos('memoryLimit')); memoryLimit=0; end;
if isempty(whos('omitNativeGrid')); omitNativeGrid=0; end;

gcmfaces_global; mygrid=[];

if nargin==0;%assume that LLC90 grid is used
  if ~isempty(dir('nctiles_grid')); 
    mygrid.dirGrid=['nctiles_grid' filesep];
    mygrid.fileFormat='nctiles';
  elseif ~isempty(dir('GRID'));
    mygrid.dirGrid=['GRID' filesep];
    mygrid.fileFormat='compact';
  else;
     fprintf('\n please indicate the grid directory (e.g., ''./'' or ''nctiles_grid/'') \n\n');
     fprintf('   The ECCO v4 grid can be obtained as follows: \n');
     fprintf(['   wget --recursive ftp://mit.ecco-group.org/ecco_for_las/' ...
              'version_4/release1/nctiles_grid \n']);
     fprintf('   mv mit.ecco-group.org/ecco_for_las/version_4/release1/nctiles_grid . \n\n');
     dirGrid=input('');
     mygrid.dirGrid=[dirGrid filesep];
     if ~isempty(dir([mygrid.dirGrid 'GRID.0001.nc']));
       mygrid.fileFormat='nctiles';
     elseif ~isempty(dir([mygrid.dirGrid 'XC.meta']));
       mygrid.fileFormat='compact';
     else;
       error(['could not find grid files in ' mygrid.dirGrid]);
     end;
  end;
  mygrid.nFaces=5;
  mygrid.gcm2facesFast=false;
  mygrid.memoryLimit=0;
  omitNativeGrid=isempty(dir([mygrid.dirGrid 'tile001.mitgrid']));
else;%user specified settings
  mygrid.dirGrid=dirGrid;
  mygrid.nFaces=nFaces;
  mygrid.fileFormat=fileFormat;
  mygrid.gcm2facesFast=false;
  mygrid.memoryLimit=memoryLimit;
end;

if mygrid.memoryLimit>0;
    gcmfaces_msg(['* Warning from grid_load : memoryLimit>0 ' ...
        'may precludes advanced gmcfaces functions.'],'');
end;
if mygrid.memoryLimit>1;
    gcmfaces_msg(['* Warning from grid_load : memoryLimit>1 ' ...
        'may only allow for basic fields displays.'],'');
end;

if strcmp(mygrid.fileFormat,'nctiles');
    mygrid.ioSize=[90 1170];
    mygrid.facesSize=[[90 270];[90 270];[90 90];[270 90];[270 90];[90 90]];
    mygrid.facesExpand=[];
elseif ~isempty(dir([mygrid.dirGrid 'grid.specs.mat']));
    specs=open([mygrid.dirGrid 'grid.specs.mat']);
    mygrid.ioSize=specs.ioSize;
    mygrid.facesSize=specs.facesSize;
    mygrid.facesExpand=specs.facesExpand;
    %example for creating grid.specs.mat, to put in dirGrid :
    %ioSize=[364500 1];
    %facesSize=[[270 450];[0 0];[270 270];[180 270];[450 270]];
    %facesExpand=[270 450];
    %save grid.specs.mat ioSize facesSize facesExpand;
elseif strcmp(mygrid.fileFormat,'compact');
    v0=rdmds([mygrid.dirGrid 'XC']);
    mygrid.ioSize=size(v0);
    nn=size(v0,1); pp=size(v0,2)/nn;
    mm=(pp+4-mygrid.nFaces)/4*nn;
    mygrid.facesSize=[[nn mm];[nn mm];[nn nn];[mm nn];[mm nn];[nn nn]];
    mygrid.facesExpand=[];
elseif strcmp(mygrid.fileFormat,'cube');
    v0=rdmds([mygrid.dirGrid 'XC']);
    mygrid.ioSize=size(v0);
    nn=size(v0,2);
    mygrid.facesSize=[[nn nn];[nn nn];[nn nn];[nn nn];[nn nn];[nn nn]];
    mygrid.facesExpand=[];
elseif strcmp(mygrid.fileFormat,'straight');
    v0=rdmds([mygrid.dirGrid 'XC']);
    mygrid.ioSize=size(v0);
    mygrid.facesSize=mygrid.ioSize;
    mygrid.facesExpand=[];
end;

mygrid.missVal=NaN;%will be set to 0 once the grid has been loaded.

if  ~(mygrid.nFaces==1&strcmp(mygrid.fileFormat,'straight'))&...
        ~(mygrid.nFaces==6&strcmp(mygrid.fileFormat,'cube'))&...
        ~(mygrid.nFaces==6&strcmp(mygrid.fileFormat,'compact'))&...
        ~(mygrid.nFaces==5&strcmp(mygrid.fileFormat,'compact'))&...
        ~(mygrid.nFaces==5&strcmp(mygrid.fileFormat,'nctiles'));
    error('non-supported grid topology');
end;

if strcmp(mygrid.fileFormat,'nctiles');
  %place holders (needed for read_nctiles)
  tmp1=NaN*zeros(90,270);
  tmp2=NaN*zeros(90,90);
  tmp3=NaN*zeros(270,90);
  mygrid.XC=gcmfaces({tmp1,tmp1,tmp2,tmp3,tmp3});
  mygrid.YC=gcmfaces({tmp1,tmp1,tmp2,tmp3,tmp3});
  mygrid.RC=NaN*zeros(50,1);
  clear tmp?;
end;

%the various grid fields:
if mygrid.memoryLimit==0;
    list0={'XC','XG','YC','YG','RAC','RAZ','DXC','DXG','DYC','DYG','hFacC','hFacS','hFacW','Depth'};
elseif mygrid.memoryLimit==1;
    list0={'XC','XG','YC','YG','RAC','RAZ','DXC','DXG','DYC','DYG','hFacC','Depth'};
elseif mygrid.memoryLimit==2;
    list0={'XC','YC'};
end;

for iFld=1:length(list0);
    if ~strcmp(mygrid.fileFormat,'nctiles');
      eval(['mygrid.' list0{iFld} '=rdmds2gcmfaces([mygrid.dirGrid ''' list0{iFld} '*'']);']);
    else;
      eval(['mygrid.' list0{iFld} '=read_nctiles([mygrid.dirGrid ''GRID''],''' list0{iFld} ''');']);
    end;
end;

%the vertical grid
list0={'RC','RF','DRC','DRF'};
for iFld=1:length(list0);
    if ~strcmp(mygrid.fileFormat,'nctiles');
      eval(['mygrid.' list0{iFld} '=squeeze(rdmds([mygrid.dirGrid ''' list0{iFld} '*'']));']);
    else;
      eval(['ncload ' mygrid.dirGrid 'GRID.0001.nc ' list0{iFld} ';']);
      eval(['mygrid.' list0{iFld} '=' list0{iFld} ''';']);
      if strcmp(list0{iFld},'RF'); mygrid.RF=[mygrid.RF;NaN]; end;
    end;
end;

%grid orientation
if mygrid.memoryLimit<2;
    list0={'AngleCS','AngleSN'};
    test0=~isempty(dir([mygrid.dirGrid 'AngleCS*']));
    if strcmp(mygrid.fileFormat,'nctiles');
        for iFld=1:length(list0);
            eval(['mygrid.' list0{iFld} '=read_nctiles([mygrid.dirGrid ''GRID''],''' list0{iFld} ''');']);
        end;
    elseif test0;
        for iFld=1:length(list0);
            eval(['mygrid.' list0{iFld} '=rdmds2gcmfaces([mygrid.dirGrid ''' list0{iFld} '*'']);']);
        end;
    else;
        warning('\n AngleCS/AngleSN not found; set to 1/0 assuming lat/lon grid.\n');
        mygrid.AngleCS=mygrid.XC; mygrid.AngleCS(:)=1;
        mygrid.AngleSN=mygrid.XC; mygrid.AngleSN(:)=0;
    end;
end;

%if grid is incomplete (blank tiles) then try to get 
%additional info from native grid, or apply missing value.
test0=sum(isnan(mygrid.XC))>0;
test1=prod(mygrid.ioSize)~=sum(isnan(NaN*mygrid.XC(:)));
if (test0|test1)&~omitNativeGrid;
  %treat fields that are part of the native grid
  mygrid1=mygrid; mygrid=[];
  grid_load_native(mygrid.dirGrid,nFaces,0);
  mygrid1.XC=mygrid.XC; mygrid1.YC=mygrid.YC;
  mygrid1.XG=mygrid.XG; mygrid1.YG=mygrid.YG;
  mygrid1.RAC=mygrid.RAC;
  mygrid=mygrid1;
  %apply missing value for fields that aren't
  list0={'hFacC','hFacS','hFacW','Depth','AngleCS','AngleSN'};
  for ii=1:length(list0); 
    eval(['tmp1=mygrid.' list0{ii} ';']);
    tmp1(isnan(tmp1))=0;
    eval(['mygrid.' list0{ii} '=tmp1;']);
  end;
  %and fix angles if needed
  tmp1=mygrid.AngleCS.^2+mygrid.AngleSN.^2;
  tmp1=1*(tmp1>0.999&tmp1<1.001);
  mygrid.AngleCS(tmp1==0)=1;
  mygrid.AngleSN(tmp1==0)=0;
end;

%get full RAZ (incl. 'extra line and column') needed for e.g. rotational computations
if mygrid.memoryLimit<2&~omitNativeGrid;
    grid_load_native_RAZ;
end;

%grid masks
if mygrid.memoryLimit<1;
    mygrid.hFacCsurf=mygrid.hFacC;
    for ff=1:mygrid.hFacC.nFaces; mygrid.hFacCsurf{ff}=mygrid.hFacC{ff}(:,:,1); end;
    
    mskC=mygrid.hFacC; mskC(mskC==0)=NaN; mskC(mskC>0)=1; mygrid.mskC=mskC;
    mskW=mygrid.hFacW; mskW(mskW==0)=NaN; mskW(mskW>0)=1; mygrid.mskW=mskW;
    mskS=mygrid.hFacS; mskS(mskS==0)=NaN; mskS(mskS>0)=1; mygrid.mskS=mskS;
end;

%zonal mean and sections needed for transport computations
if mygrid.memoryLimit<1;
    if ~isfield(mygrid,'mygrid.LATS_MASKS');
        gcmfaces_lines_zonal;
        mygrid.LATS=[mygrid.LATS_MASKS.lat]';
    end;
    if ~isfield(mygrid,'LINES_MASKS');
        [lonPairs,latPairs,names]=gcmfaces_lines_pairs;
        gcmfaces_lines_transp(lonPairs,latPairs,names);
    end;
end;

%to allow convert2gcmfaces/doFast:
if isempty(mygrid.facesExpand)&mygrid.memoryLimit<2;
    tmp1=convert2gcmfaces(mygrid.XC);
    tmp1(:)=[1:length(tmp1(:))];
    nn=length(tmp1(:));
    mygrid.gcm2faces=convert2gcmfaces(tmp1);
    mygrid.faces2gcmSize=size(tmp1);
    mygrid.faces2gcm=convert2gcmfaces(tmp1);
    for iFace=1:mygrid.nFaces;
        n=length(mygrid.gcm2faces{iFace}(:));
        mygrid.faces2gcm{iFace}=mygrid.gcm2faces{iFace}(:);
        mygrid.gcm2faces{iFace}=sparse([1:n],mygrid.gcm2faces{iFace}(:),ones(1,n),n,nn);
    end;
    mygrid.gcm2facesFast=true;
end;

%reset missVal parameter to 0. 
%Note : this is only used by convert2widefaces, for runs with cropped grids.
%Note : 0 should not be used as a fill for the grid itself (NaN was used).
mygrid.missVal=0;

mygrid.dirGrid=[pwd filesep mygrid.dirGrid];
    
1	gforget	1.13	function []=grid_load(dirGrid,nFaces,fileFormat,memoryLimit,omitNativeGrid);
2	gforget	1.5	%object: load grid information, convert it to gcmfaces format
3			% and encapsulate it in the global mygrid structure.
4			%inputs: dirGrid is the directory where the grid files (gcm output) can be found.
5			% nFaces is the number of faces in this gcm set-up of current interest.
6			% fileFormat is the file format ('straight','cube','compact')
7	gforget	1.9	%optional: memoryLimit is a flag that allows the user to omit secondary
8			% grid fields in case memory/storage become an issue. It
9			% takes 3 values : (0; the default) includes everything
10			% (1) omits all 3D fields but hFacC (2) only loads XC & YC.
11	gforget	1.13	% omitNativeGrid is a flag (0 by default) to bypass (when flag 1)
12			% grid_load_native and grid_load_native_RAZ calls (that can
13			% complement mygrid based upon e.g. tile*.mitgrid files)
14	gforget	1.1
15	gforget	1.9	if isempty(whos('memoryLimit')); memoryLimit=0; end;
16	gforget	1.13	if isempty(whos('omitNativeGrid')); omitNativeGrid=0; end;
17	gforget	1.9
18	gforget	1.7	gcmfaces_global; mygrid=[];
19
20	gforget	1.15	if nargin==0;%assume that LLC90 grid is used
21			if ~isempty(dir('nctiles_grid'));
22	gforget	1.18	mygrid.dirGrid=['nctiles_grid' filesep];
23	gforget	1.15	mygrid.fileFormat='nctiles';
24			elseif ~isempty(dir('GRID'));
25	gforget	1.18	mygrid.dirGrid=['GRID' filesep];
26	gforget	1.15	mygrid.fileFormat='compact';
27			else;
28	gforget	1.20	fprintf('\n please indicate the grid directory (e.g., ''./'' or ''nctiles_grid/'') \n\n');
29			fprintf(' The ECCO v4 grid can be obtained as follows: \n');
30			fprintf([' wget --recursive ftp://mit.ecco-group.org/ecco_for_las/' ...
31	gforget	1.16	'version_4/release1/nctiles_grid \n']);
32	gforget	1.20	fprintf(' mv mit.ecco-group.org/ecco_for_las/version_4/release1/nctiles_grid . \n\n');
33			dirGrid=input('');
34			mygrid.dirGrid=[dirGrid filesep];
35			if ~isempty(dir([mygrid.dirGrid 'GRID.0001.nc']));
36			mygrid.fileFormat='nctiles';
37			elseif ~isempty(dir([mygrid.dirGrid 'XC.meta']));
38			mygrid.fileFormat='compact';
39			else;
40			error(['could not find grid files in ' mygrid.dirGrid]);
41			end;
42	gforget	1.15	end;
43			mygrid.nFaces=5;
44			mygrid.gcm2facesFast=false;
45			mygrid.memoryLimit=0;
46			omitNativeGrid=isempty(dir([mygrid.dirGrid 'tile001.mitgrid']));
47			else;%user specified settings
48			mygrid.dirGrid=dirGrid;
49			mygrid.nFaces=nFaces;
50			mygrid.fileFormat=fileFormat;
51			mygrid.gcm2facesFast=false;
52			mygrid.memoryLimit=memoryLimit;
53			end;
54	gforget	1.9
55			if mygrid.memoryLimit>0;
56			gcmfaces_msg(['* Warning from grid_load : memoryLimit>0 ' ...
57			'may precludes advanced gmcfaces functions.'],'');
58			end;
59			if mygrid.memoryLimit>1;
60			gcmfaces_msg(['* Warning from grid_load : memoryLimit>1 ' ...
61			'may only allow for basic fields displays.'],'');
62			end;
63
64	gforget	1.15	if strcmp(mygrid.fileFormat,'nctiles');
65			mygrid.ioSize=[90 1170];
66			mygrid.facesSize=[[90 270];[90 270];[90 90];[270 90];[270 90];[90 90]];
67			mygrid.facesExpand=[];
68			elseif ~isempty(dir([mygrid.dirGrid 'grid.specs.mat']));
69			specs=open([mygrid.dirGrid 'grid.specs.mat']);
70	gforget	1.9	mygrid.ioSize=specs.ioSize;
71			mygrid.facesSize=specs.facesSize;
72			mygrid.facesExpand=specs.facesExpand;
73			%example for creating grid.specs.mat, to put in dirGrid :
74			%ioSize=[364500 1];
75			%facesSize=[[270 450];[0 0];[270 270];[180 270];[450 270]];
76			%facesExpand=[270 450];
77			%save grid.specs.mat ioSize facesSize facesExpand;
78	gforget	1.15	elseif strcmp(mygrid.fileFormat,'compact');
79			v0=rdmds([mygrid.dirGrid 'XC']);
80	gforget	1.9	mygrid.ioSize=size(v0);
81			nn=size(v0,1); pp=size(v0,2)/nn;
82			mm=(pp+4-mygrid.nFaces)/4*nn;
83	gforget	1.10	mygrid.facesSize=[[nn mm];[nn mm];[nn nn];[mm nn];[mm nn];[nn nn]];
84			mygrid.facesExpand=[];
85	gforget	1.15	elseif strcmp(mygrid.fileFormat,'cube');
86			v0=rdmds([mygrid.dirGrid 'XC']);
87	gforget	1.10	mygrid.ioSize=size(v0);
88			nn=size(v0,2);
89			mygrid.facesSize=[[nn nn];[nn nn];[nn nn];[nn nn];[nn nn];[nn nn]];
90			mygrid.facesExpand=[];
91	gforget	1.15	elseif strcmp(mygrid.fileFormat,'straight');
92			v0=rdmds([mygrid.dirGrid 'XC']);
93	gforget	1.10	mygrid.ioSize=size(v0);
94			mygrid.facesSize=mygrid.ioSize;
95	gforget	1.9	mygrid.facesExpand=[];
96			end;
97	gforget	1.15
98	gforget	1.12	mygrid.missVal=NaN;%will be set to 0 once the grid has been loaded.
99	gforget	1.1
100	gforget	1.15	if ~(mygrid.nFaces==1&strcmp(mygrid.fileFormat,'straight'))&...
101			~(mygrid.nFaces==6&strcmp(mygrid.fileFormat,'cube'))&...
102			~(mygrid.nFaces==6&strcmp(mygrid.fileFormat,'compact'))&...
103			~(mygrid.nFaces==5&strcmp(mygrid.fileFormat,'compact'))&...
104			~(mygrid.nFaces==5&strcmp(mygrid.fileFormat,'nctiles'));
105			error('non-supported grid topology');
106	gforget	1.1	end;
107
108	gforget	1.17	if strcmp(mygrid.fileFormat,'nctiles');
109			%place holders (needed for read_nctiles)
110			tmp1=NaN*zeros(90,270);
111			tmp2=NaN*zeros(90,90);
112			tmp3=NaN*zeros(270,90);
113			mygrid.XC=gcmfaces({tmp1,tmp1,tmp2,tmp3,tmp3});
114			mygrid.YC=gcmfaces({tmp1,tmp1,tmp2,tmp3,tmp3});
115			mygrid.RC=NaN*zeros(50,1);
116			clear tmp?;
117			end;
118
119	gforget	1.6	%the various grid fields:
120	gforget	1.9	if mygrid.memoryLimit==0;
121			list0={'XC','XG','YC','YG','RAC','RAZ','DXC','DXG','DYC','DYG','hFacC','hFacS','hFacW','Depth'};
122			elseif mygrid.memoryLimit==1;
123			list0={'XC','XG','YC','YG','RAC','RAZ','DXC','DXG','DYC','DYG','hFacC','Depth'};
124			elseif mygrid.memoryLimit==2;
125			list0={'XC','YC'};
126			end;
127
128	gforget	1.1	for iFld=1:length(list0);
129	gforget	1.15	if ~strcmp(mygrid.fileFormat,'nctiles');
130			eval(['mygrid.' list0{iFld} '=rdmds2gcmfaces([mygrid.dirGrid ''' list0{iFld} '*'']);']);
131			else;
132			eval(['mygrid.' list0{iFld} '=read_nctiles([mygrid.dirGrid ''GRID''],''' list0{iFld} ''');']);
133			end;
134	gforget	1.1	end;
135
136	gforget	1.9	%the vertical grid
137			list0={'RC','RF','DRC','DRF'};
138			for iFld=1:length(list0);
139	gforget	1.15	if ~strcmp(mygrid.fileFormat,'nctiles');
140			eval(['mygrid.' list0{iFld} '=squeeze(rdmds([mygrid.dirGrid ''' list0{iFld} '*'']));']);
141			else;
142			eval(['ncload ' mygrid.dirGrid 'GRID.0001.nc ' list0{iFld} ';']);
143			eval(['mygrid.' list0{iFld} '=' list0{iFld} ''';']);
144			if strcmp(list0{iFld},'RF'); mygrid.RF=[mygrid.RF;NaN]; end;
145			end;
146	gforget	1.9	end;
147
148			%grid orientation
149			if mygrid.memoryLimit<2;
150			list0={'AngleCS','AngleSN'};
151	gforget	1.15	test0=~isempty(dir([mygrid.dirGrid 'AngleCS*']));
152			if strcmp(mygrid.fileFormat,'nctiles');
153			for iFld=1:length(list0);
154			eval(['mygrid.' list0{iFld} '=read_nctiles([mygrid.dirGrid ''GRID''],''' list0{iFld} ''');']);
155			end;
156			elseif test0;
157	gforget	1.9	for iFld=1:length(list0);
158	gforget	1.15	eval(['mygrid.' list0{iFld} '=rdmds2gcmfaces([mygrid.dirGrid ''' list0{iFld} '*'']);']);
159	gforget	1.9	end;
160			else;
161			warning('\n AngleCS/AngleSN not found; set to 1/0 assuming lat/lon grid.\n');
162			mygrid.AngleCS=mygrid.XC; mygrid.AngleCS(:)=1;
163			mygrid.AngleSN=mygrid.XC; mygrid.AngleSN(:)=0;
164	gforget	1.8	end;
165	gforget	1.4	end;
166
167	gforget	1.12	%if grid is incomplete (blank tiles) then try to get
168			%additional info from native grid, or apply missing value.
169			test0=sum(isnan(mygrid.XC))>0;
170			test1=prod(mygrid.ioSize)~=sum(isnan(NaN*mygrid.XC(:)));
171	gforget	1.13	if (test0\|test1)&~omitNativeGrid;
172	gforget	1.12	%treat fields that are part of the native grid
173			mygrid1=mygrid; mygrid=[];
174	gforget	1.15	grid_load_native(mygrid.dirGrid,nFaces,0);
175	gforget	1.12	mygrid1.XC=mygrid.XC; mygrid1.YC=mygrid.YC;
176	gforget	1.14	mygrid1.XG=mygrid.XG; mygrid1.YG=mygrid.YG;
177	gforget	1.12	mygrid1.RAC=mygrid.RAC;
178			mygrid=mygrid1;
179			%apply missing value for fields that aren't
180			list0={'hFacC','hFacS','hFacW','Depth','AngleCS','AngleSN'};
181			for ii=1:length(list0);
182			eval(['tmp1=mygrid.' list0{ii} ';']);
183			tmp1(isnan(tmp1))=0;
184			eval(['mygrid.' list0{ii} '=tmp1;']);
185			end;
186			%and fix angles if needed
187			tmp1=mygrid.AngleCS.^2+mygrid.AngleSN.^2;
188			tmp1=1*(tmp1>0.999&tmp1<1.001);
189			mygrid.AngleCS(tmp1==0)=1;
190			mygrid.AngleSN(tmp1==0)=0;
191			end;
192
193	gforget	1.11	%get full RAZ (incl. 'extra line and column') needed for e.g. rotational computations
194	gforget	1.13	if mygrid.memoryLimit<2&~omitNativeGrid;
195	gforget	1.11	grid_load_native_RAZ;
196			end;
197
198	gforget	1.9	%grid masks
199			if mygrid.memoryLimit<1;
200			mygrid.hFacCsurf=mygrid.hFacC;
201			for ff=1:mygrid.hFacC.nFaces; mygrid.hFacCsurf{ff}=mygrid.hFacC{ff}(:,:,1); end;
202
203			mskC=mygrid.hFacC; mskC(mskC==0)=NaN; mskC(mskC>0)=1; mygrid.mskC=mskC;
204			mskW=mygrid.hFacW; mskW(mskW==0)=NaN; mskW(mskW>0)=1; mygrid.mskW=mskW;
205			mskS=mygrid.hFacS; mskS(mskS==0)=NaN; mskS(mskS>0)=1; mygrid.mskS=mskS;
206	gforget	1.1	end;
207
208	gforget	1.9	%zonal mean and sections needed for transport computations
209			if mygrid.memoryLimit<1;
210			if ~isfield(mygrid,'mygrid.LATS_MASKS');
211			gcmfaces_lines_zonal;
212			mygrid.LATS=[mygrid.LATS_MASKS.lat]';
213			end;
214			if ~isfield(mygrid,'LINES_MASKS');
215	gforget	1.19	[lonPairs,latPairs,names]=gcmfaces_lines_pairs;
216	gforget	1.9	gcmfaces_lines_transp(lonPairs,latPairs,names);
217			end;
218			end;
219	gforget	1.2
220	gforget	1.8	%to allow convert2gcmfaces/doFast:
221	gforget	1.9	if isempty(mygrid.facesExpand)&mygrid.memoryLimit<2;
222			tmp1=convert2gcmfaces(mygrid.XC);
223			tmp1(:)=[1:length(tmp1(:))];
224			nn=length(tmp1(:));
225			mygrid.gcm2faces=convert2gcmfaces(tmp1);
226			mygrid.faces2gcmSize=size(tmp1);
227			mygrid.faces2gcm=convert2gcmfaces(tmp1);
228			for iFace=1:mygrid.nFaces;
229			n=length(mygrid.gcm2faces{iFace}(:));
230			mygrid.faces2gcm{iFace}=mygrid.gcm2faces{iFace}(:);
231			mygrid.gcm2faces{iFace}=sparse([1:n],mygrid.gcm2faces{iFace}(:),ones(1,n),n,nn);
232			end;
233			mygrid.gcm2facesFast=true;
234	gforget	1.6	end;
235
236	gforget	1.12	%reset missVal parameter to 0.
237			%Note : this is only used by convert2widefaces, for runs with cropped grids.
238			%Note : 0 should not be used as a fill for the grid itself (NaN was used).
239			mygrid.missVal=0;
240	gforget	1.1
241	gforget	1.18	mygrid.dirGrid=[pwd filesep mygrid.dirGrid];
242