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=[pwd filesep 'nctiles_grid' filesep];
    mygrid.fileFormat='nctiles';
  elseif ~isempty(dir('GRID'));
    mygrid.dirGrid=[pwd filesep 'GRID' filesep];
    mygrid.fileFormat='compact';
  else;
     fprintf('\n 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');
     error('could not find either ''nctiles_grid/'' or ''GRID/''');
  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]=line_greatC_TUV_MASKS_v4;
        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;

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	1.16	mygrid.dirGrid=[pwd filesep 'nctiles_grid' filesep];
23	gforget	1.15	mygrid.fileFormat='nctiles';
24			elseif ~isempty(dir('GRID'));
25	gforget	1.16	mygrid.dirGrid=[pwd filesep 'GRID' filesep];
26	gforget	1.15	mygrid.fileFormat='compact';
27			else;
28	gforget	1.16	fprintf('\n The ECCO v4 grid can be obtained as follows: \n');
29			fprintf([' wget --recursive ftp://mit.ecco-group.org/ecco_for_las/' ...
30			'version_4/release1/nctiles_grid \n']);
31			fprintf(' mv mit.ecco-group.org/ecco_for_las/version_4/release1/nctiles_grid . \n\n');
32	gforget	1.15	error('could not find either ''nctiles_grid/'' or ''GRID/''');
33			end;
34			mygrid.nFaces=5;
35			mygrid.gcm2facesFast=false;
36			mygrid.memoryLimit=0;
37			omitNativeGrid=isempty(dir([mygrid.dirGrid 'tile001.mitgrid']));
38			else;%user specified settings
39			mygrid.dirGrid=dirGrid;
40			mygrid.nFaces=nFaces;
41			mygrid.fileFormat=fileFormat;
42			mygrid.gcm2facesFast=false;
43			mygrid.memoryLimit=memoryLimit;
44			end;
45	gforget	1.9
46			if mygrid.memoryLimit>0;
47			gcmfaces_msg(['* Warning from grid_load : memoryLimit>0 ' ...
48			'may precludes advanced gmcfaces functions.'],'');
49			end;
50			if mygrid.memoryLimit>1;
51			gcmfaces_msg(['* Warning from grid_load : memoryLimit>1 ' ...
52			'may only allow for basic fields displays.'],'');
53			end;
54
55	gforget	1.15	if strcmp(mygrid.fileFormat,'nctiles');
56			mygrid.ioSize=[90 1170];
57			mygrid.facesSize=[[90 270];[90 270];[90 90];[270 90];[270 90];[90 90]];
58			mygrid.facesExpand=[];
59			elseif ~isempty(dir([mygrid.dirGrid 'grid.specs.mat']));
60			specs=open([mygrid.dirGrid 'grid.specs.mat']);
61	gforget	1.9	mygrid.ioSize=specs.ioSize;
62			mygrid.facesSize=specs.facesSize;
63			mygrid.facesExpand=specs.facesExpand;
64			%example for creating grid.specs.mat, to put in dirGrid :
65			%ioSize=[364500 1];
66			%facesSize=[[270 450];[0 0];[270 270];[180 270];[450 270]];
67			%facesExpand=[270 450];
68			%save grid.specs.mat ioSize facesSize facesExpand;
69	gforget	1.15	elseif strcmp(mygrid.fileFormat,'compact');
70			v0=rdmds([mygrid.dirGrid 'XC']);
71	gforget	1.9	mygrid.ioSize=size(v0);
72			nn=size(v0,1); pp=size(v0,2)/nn;
73			mm=(pp+4-mygrid.nFaces)/4*nn;
74	gforget	1.10	mygrid.facesSize=[[nn mm];[nn mm];[nn nn];[mm nn];[mm nn];[nn nn]];
75			mygrid.facesExpand=[];
76	gforget	1.15	elseif strcmp(mygrid.fileFormat,'cube');
77			v0=rdmds([mygrid.dirGrid 'XC']);
78	gforget	1.10	mygrid.ioSize=size(v0);
79			nn=size(v0,2);
80			mygrid.facesSize=[[nn nn];[nn nn];[nn nn];[nn nn];[nn nn];[nn nn]];
81			mygrid.facesExpand=[];
82	gforget	1.15	elseif strcmp(mygrid.fileFormat,'straight');
83			v0=rdmds([mygrid.dirGrid 'XC']);
84	gforget	1.10	mygrid.ioSize=size(v0);
85			mygrid.facesSize=mygrid.ioSize;
86	gforget	1.9	mygrid.facesExpand=[];
87			end;
88	gforget	1.15
89	gforget	1.12	mygrid.missVal=NaN;%will be set to 0 once the grid has been loaded.
90	gforget	1.1
91	gforget	1.15	if ~(mygrid.nFaces==1&strcmp(mygrid.fileFormat,'straight'))&...
92			~(mygrid.nFaces==6&strcmp(mygrid.fileFormat,'cube'))&...
93			~(mygrid.nFaces==6&strcmp(mygrid.fileFormat,'compact'))&...
94			~(mygrid.nFaces==5&strcmp(mygrid.fileFormat,'compact'))&...
95			~(mygrid.nFaces==5&strcmp(mygrid.fileFormat,'nctiles'));
96			error('non-supported grid topology');
97	gforget	1.1	end;
98
99	gforget	1.17	if strcmp(mygrid.fileFormat,'nctiles');
100			%place holders (needed for read_nctiles)
101			tmp1=NaN*zeros(90,270);
102			tmp2=NaN*zeros(90,90);
103			tmp3=NaN*zeros(270,90);
104			mygrid.XC=gcmfaces({tmp1,tmp1,tmp2,tmp3,tmp3});
105			mygrid.YC=gcmfaces({tmp1,tmp1,tmp2,tmp3,tmp3});
106			mygrid.RC=NaN*zeros(50,1);
107			clear tmp?;
108			end;
109
110	gforget	1.6	%the various grid fields:
111	gforget	1.9	if mygrid.memoryLimit==0;
112			list0={'XC','XG','YC','YG','RAC','RAZ','DXC','DXG','DYC','DYG','hFacC','hFacS','hFacW','Depth'};
113			elseif mygrid.memoryLimit==1;
114			list0={'XC','XG','YC','YG','RAC','RAZ','DXC','DXG','DYC','DYG','hFacC','Depth'};
115			elseif mygrid.memoryLimit==2;
116			list0={'XC','YC'};
117			end;
118
119	gforget	1.1	for iFld=1:length(list0);
120	gforget	1.15	if ~strcmp(mygrid.fileFormat,'nctiles');
121			eval(['mygrid.' list0{iFld} '=rdmds2gcmfaces([mygrid.dirGrid ''' list0{iFld} '*'']);']);
122			else;
123			eval(['mygrid.' list0{iFld} '=read_nctiles([mygrid.dirGrid ''GRID''],''' list0{iFld} ''');']);
124			end;
125	gforget	1.1	end;
126
127	gforget	1.9	%the vertical grid
128			list0={'RC','RF','DRC','DRF'};
129			for iFld=1:length(list0);
130	gforget	1.15	if ~strcmp(mygrid.fileFormat,'nctiles');
131			eval(['mygrid.' list0{iFld} '=squeeze(rdmds([mygrid.dirGrid ''' list0{iFld} '*'']));']);
132			else;
133			eval(['ncload ' mygrid.dirGrid 'GRID.0001.nc ' list0{iFld} ';']);
134			eval(['mygrid.' list0{iFld} '=' list0{iFld} ''';']);
135			if strcmp(list0{iFld},'RF'); mygrid.RF=[mygrid.RF;NaN]; end;
136			end;
137	gforget	1.9	end;
138
139			%grid orientation
140			if mygrid.memoryLimit<2;
141			list0={'AngleCS','AngleSN'};
142	gforget	1.15	test0=~isempty(dir([mygrid.dirGrid 'AngleCS*']));
143			if strcmp(mygrid.fileFormat,'nctiles');
144			for iFld=1:length(list0);
145			eval(['mygrid.' list0{iFld} '=read_nctiles([mygrid.dirGrid ''GRID''],''' list0{iFld} ''');']);
146			end;
147			elseif test0;
148	gforget	1.9	for iFld=1:length(list0);
149	gforget	1.15	eval(['mygrid.' list0{iFld} '=rdmds2gcmfaces([mygrid.dirGrid ''' list0{iFld} '*'']);']);
150	gforget	1.9	end;
151			else;
152			warning('\n AngleCS/AngleSN not found; set to 1/0 assuming lat/lon grid.\n');
153			mygrid.AngleCS=mygrid.XC; mygrid.AngleCS(:)=1;
154			mygrid.AngleSN=mygrid.XC; mygrid.AngleSN(:)=0;
155	gforget	1.8	end;
156	gforget	1.4	end;
157
158	gforget	1.12	%if grid is incomplete (blank tiles) then try to get
159			%additional info from native grid, or apply missing value.
160			test0=sum(isnan(mygrid.XC))>0;
161			test1=prod(mygrid.ioSize)~=sum(isnan(NaN*mygrid.XC(:)));
162	gforget	1.13	if (test0\|test1)&~omitNativeGrid;
163	gforget	1.12	%treat fields that are part of the native grid
164			mygrid1=mygrid; mygrid=[];
165	gforget	1.15	grid_load_native(mygrid.dirGrid,nFaces,0);
166	gforget	1.12	mygrid1.XC=mygrid.XC; mygrid1.YC=mygrid.YC;
167	gforget	1.14	mygrid1.XG=mygrid.XG; mygrid1.YG=mygrid.YG;
168	gforget	1.12	mygrid1.RAC=mygrid.RAC;
169			mygrid=mygrid1;
170			%apply missing value for fields that aren't
171			list0={'hFacC','hFacS','hFacW','Depth','AngleCS','AngleSN'};
172			for ii=1:length(list0);
173			eval(['tmp1=mygrid.' list0{ii} ';']);
174			tmp1(isnan(tmp1))=0;
175			eval(['mygrid.' list0{ii} '=tmp1;']);
176			end;
177			%and fix angles if needed
178			tmp1=mygrid.AngleCS.^2+mygrid.AngleSN.^2;
179			tmp1=1*(tmp1>0.999&tmp1<1.001);
180			mygrid.AngleCS(tmp1==0)=1;
181			mygrid.AngleSN(tmp1==0)=0;
182			end;
183
184	gforget	1.11	%get full RAZ (incl. 'extra line and column') needed for e.g. rotational computations
185	gforget	1.13	if mygrid.memoryLimit<2&~omitNativeGrid;
186	gforget	1.11	grid_load_native_RAZ;
187			end;
188
189	gforget	1.9	%grid masks
190			if mygrid.memoryLimit<1;
191			mygrid.hFacCsurf=mygrid.hFacC;
192			for ff=1:mygrid.hFacC.nFaces; mygrid.hFacCsurf{ff}=mygrid.hFacC{ff}(:,:,1); end;
193
194			mskC=mygrid.hFacC; mskC(mskC==0)=NaN; mskC(mskC>0)=1; mygrid.mskC=mskC;
195			mskW=mygrid.hFacW; mskW(mskW==0)=NaN; mskW(mskW>0)=1; mygrid.mskW=mskW;
196			mskS=mygrid.hFacS; mskS(mskS==0)=NaN; mskS(mskS>0)=1; mygrid.mskS=mskS;
197	gforget	1.1	end;
198
199	gforget	1.9	%zonal mean and sections needed for transport computations
200			if mygrid.memoryLimit<1;
201			if ~isfield(mygrid,'mygrid.LATS_MASKS');
202			gcmfaces_lines_zonal;
203			mygrid.LATS=[mygrid.LATS_MASKS.lat]';
204			end;
205			if ~isfield(mygrid,'LINES_MASKS');
206			[lonPairs,latPairs,names]=line_greatC_TUV_MASKS_v4;
207			gcmfaces_lines_transp(lonPairs,latPairs,names);
208			end;
209			end;
210	gforget	1.2
211	gforget	1.8	%to allow convert2gcmfaces/doFast:
212	gforget	1.9	if isempty(mygrid.facesExpand)&mygrid.memoryLimit<2;
213			tmp1=convert2gcmfaces(mygrid.XC);
214			tmp1(:)=[1:length(tmp1(:))];
215			nn=length(tmp1(:));
216			mygrid.gcm2faces=convert2gcmfaces(tmp1);
217			mygrid.faces2gcmSize=size(tmp1);
218			mygrid.faces2gcm=convert2gcmfaces(tmp1);
219			for iFace=1:mygrid.nFaces;
220			n=length(mygrid.gcm2faces{iFace}(:));
221			mygrid.faces2gcm{iFace}=mygrid.gcm2faces{iFace}(:);
222			mygrid.gcm2faces{iFace}=sparse([1:n],mygrid.gcm2faces{iFace}(:),ones(1,n),n,nn);
223			end;
224			mygrid.gcm2facesFast=true;
225	gforget	1.6	end;
226
227	gforget	1.12	%reset missVal parameter to 0.
228			%Note : this is only used by convert2widefaces, for runs with cropped grids.
229			%Note : 0 should not be used as a fill for the grid itself (NaN was used).
230			mygrid.missVal=0;
231	gforget	1.1