% define desired region
nx=4320;
region_name='latlon';
minlat=-70;
maxlat=57;

% extract indices for desired region
prec='real*4';
gdir='~dmenemen/llc_4320/grid/';
fnam=[gdir 'Depth.data'];
[tmp fc ix jx]=quikread_llc(fnam,nx,1,prec,gdir,minlat,maxlat);
m(1)=0;
for f=1:length(fc)
    m(f+1)=length(ix{fc(f)});
end
n=length(jx{fc(1)});
fld=zeros(sum(m),n);
for f=1:length(fc)
    fld((sum(m(1:f))+1):sum(m(1:(f+1))),:)=tmp{fc(f)};
end
quikpcolor(fld')
thincolorbar

% get and save grid information
close all
pin='~dmenemen/llc_4320/grid/';
pout=['~dmenemen/llc_4320/regions/' region_name '/grid/'];
eval(['mkdir ' pout])
eval(['cd ' pout])
for fnm={'AngleCS','AngleSN','Depth','RAC', ...
         'U2zonDir','V2zonDir','XC','XG','YC','YG','hFacC'}
    fin=[pin fnm{1} '.data'];
    fout=[fnm{1} '_' int2str(sum(m)) 'x' int2str(n)];
    for f=1:length(fc)
        fld((sum(m(1:f))+1):sum(m(1:(f+1))),:) = ...
            read_llc_fkij(fin,nx,fc(f),1,ix{fc(f)},jx{fc(f)});
    end
    switch fnm{1}
      case {'AngleCS','U2zonDir'}, fld(:)=1;
      case {'AngleSN','V2zonDir'}, fld(:)=0;
      case 'RAC'
        fld2=fld;
        for j=1:(nx*2)
            tmp=double(fld(:,j));
            fld2(:,j)=mean(tmp(find(tmp)));
        end
        fld=fld2;
        case {'XC','XG'}, fld=fld(:,1e3)*ones(1,2*nx);
        case {'YC','YG'}, fld=ones(4*nx,1)*fld(1e3,:);
    end
    writebin(fout,fld);
end

% get and save 2D regional fields
pin='~dmenemen/llc_4320/MITgcm/run/';
pout=['~dmenemen/llc_4320/regions/' region_name '/'];
for fnm={'Eta'}
    eval(['mkdir ' pout fnm{1}])
    eval(['cd ' pout fnm{1}])
    for ts=10368:144:279360, disp(ts)
        fin=[pin fnm{1} '.' myint2str(ts,10) '.data'];
        dy=ts2dte(ts,25,2011,9,10,30);
        fout=[fnm{1} '_' int2str(sum(m)) 'x' int2str(n) '.' dy];
        for f=1:length(fc)
            fld((sum(m(1:f))+1):sum(m(1:(f+1))),:) = ...
                read_llc_fkij(fin,nx,fc(f),1,ix{fc(f)},jx{fc(f)});
        end
        writebin(fout,fld);
    end
end

% get and save regional fields of U and V
% note that zonal velocity is U in faces 1/2 and V in faces 4/5
% and meridional velocity is V in faces 1/2 and -U in faces 4/5
pin='~dmenemen/llc_4320/MITgcm/run/';
pout=['~dmenemen/llc_4320/regions/' region_name '/'];
kx=1:1;
eval(['mkdir ' pout 'U'])
eval(['mkdir ' pout 'V'])
eval(['cd ' pout])
for ts=10368:144:279360, disp(ts)
    finu=[pin 'U.' myint2str(ts,10) '.data'];
    finv=[pin 'V.' myint2str(ts,10) '.data'];
    dy=ts2dte(ts,25,2011,9,10,30);
    foutu=['U/U_' int2str(sum(m)) 'x' int2str(n) 'x' int2str(length(kx)) '.' dy];
    foutv=['V/V_' int2str(sum(m)) 'x' int2str(n) 'x' int2str(length(kx)) '.' dy];
    for k=1:length(kx); mydisp(k)
        for f=1:length(fc)
            switch fc(f)
              case {1,2}
                fldu((sum(m(1:f))+1):sum(m(1:(f+1))),:) = ...
                    read_llc_fkij(finu,nx,fc(f),kx(k),ix{fc(f)},jx{fc(f)});
                fldv((sum(m(1:f))+1):sum(m(1:(f+1))),:) = ...
                    read_llc_fkij(finv,nx,fc(f),kx(k),ix{fc(f)},jx{fc(f)});
              case {4,5}
                fldu((sum(m(1:f))+1):sum(m(1:(f+1))),:) = ...
                    read_llc_fkij(finv,nx,fc(f),kx(k),ix{fc(f)},jx{fc(f)});
                fldv((sum(m(1:f))+1):sum(m(1:(f+1))),:) = - ...               % <<<<<<<<
                    read_llc_fkij(finu,nx,fc(f),kx(k),ix{fc(f)},jx{fc(f)}-1); % <<<<<<<<
            end
        end
        writebin(foutu,fldu,1,'real*4',k-1);
        writebin(foutv,fldv,1,'real*4',k-1);
    end
end