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April 2, 2018 19:21
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Extract the lat-lon part of ecco v4 fields (see doi.org/10.5194/gmd-8-3071-2015)
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function [FLD,varargout]=eccov4_lonlat(fldLoc,fldName,numRec,varargin); | |
% | |
% Extract the lat-lon part of ecco v4 fields. | |
% FLD=eccov4_lonlat(fldLoc,fldName,numRec) reads record | |
% numRec (set to [] for all records) of fldName in fldLoc | |
% ---> assumption : fldName designates a variable located at grid cell | |
% centers (e.g. RAC) | |
% | |
% [FLD,MATE]=eccov4_lonlat(fldLoc,fldName,numRec,mateLoc,mateName,1) | |
% reads record numRec of fldName,mateName in fldLoc,mateLoc | |
% ---> assumption : fldName,mateName designate un-signed staggered | |
% variables at grid cell edges (e.g. DXC,DYC) | |
% | |
% [FLD,MATE]=eccov4_lonlat(fldLoc,fldName,numRec,mateLoc,mateName,-1) reads | |
% reads record numRec of fldName,mateName in fldLoc,mateLoc and flip signs | |
% ---> assumption : fldName,mateName designate staggered vector | |
% variables at grid cell edges (e.g. UVELMASS,VVELMASS) | |
% | |
% Examples: | |
% | |
% fldLoc='nctiles_grid/GRID'; | |
% XC=eccov4_lonlat(fldLoc,'XC',1); | |
% YC=eccov4_lonlat(fldLoc,'YC',1); | |
% | |
% fldLoc='nctiles_grid/GRID'; fldName='DXC'; | |
% mateLoc='nctiles_grid/GRID'; mateName='DYC'; | |
% [DXC,DYC]=eccov4_lonlat(fldLoc,fldName,1,mateLoc,mateName,1); | |
% | |
% fldLoc='nctiles_climatology/UVELMASS/UVELMASS'; | |
% mateLoc='nctiles_climatology/VVELMASS/VVELMASS'; | |
% [advx,advy]=eccov4_lonlat(fldLoc,'UVELMASS',1,mateLoc,'VVELMASS',-1); | |
% | |
% (Version 3; 2017/01/27) | |
%optional input parameters | |
if nargin>3; | |
mateLoc=varargin{1}; | |
mateName=varargin{2}; | |
changeSign=varargin{3}; | |
end; | |
%determine directory and file names | |
[nameDir,nameFil]=eccov4_search(fldLoc,fldName); | |
%set dimensions | |
fil=fullfile(nameDir,filesep,nameFil(1).name); | |
tmp=ncread(fil,fldName); | |
siz=size(tmp); | |
strt=ones(size(siz)); cnt=siz; | |
if ~isempty(numRec)&(length(siz)>2); | |
strt(end)=numRec; cnt(end)=1; | |
end; | |
%read from file | |
fld={}; | |
for T=1:length(nameFil) %loop through tiles | |
fil=fullfile(nameDir,filesep,nameFil(T).name); | |
fld{T}=ncread(fil,fldName,strt,cnt); | |
end %for T loop through tiles | |
%re-arrange into faces | |
fld=eccov4_faces(fld); | |
if nargin>3; | |
%determine directory and file names | |
[nameDir,nameFil]=eccov4_search(mateLoc,mateName); | |
%read from file | |
mate={}; | |
for T=1:length(nameFil) %loop through tiles | |
fil=fullfile(nameDir,filesep,nameFil(T).name); | |
mate{T}=ncread(fil,mateName,strt,cnt); | |
end %for T loop through tiles | |
%re-arrange into faces | |
mate=eccov4_faces(mate); | |
end; | |
if nargin<4; | |
%extract longitude-latitude sector | |
FLD=eccov4_array(fld); | |
if strcmp(fldName,'YG')|strcmp(fldName,'RAZ'); FLD(181:360,1:270)=FLD(1:180,1:270); end; | |
FLD=FLD(:,62:239,:,:); | |
FLD=circshift(FLD,[142 0]); | |
if strcmp(fldName,'XG'); FLD(1,:)=FLD(1,:)-360; end; | |
else; | |
%extract first component: | |
FLD=eccov4_array(fld); | |
FLD=FLD(:,62:239,:,:); | |
FLD(1:90,:,:,:)=fld{1}(:,62:239,:,:); | |
FLD(91:180,:,:,:)=fld{2}(:,62:239,:,:); | |
tmp1=flipdim(permute(mate{4},[2 1 3 4]),2); | |
FLD(181:270,:,:,:)=tmp1(:,62:239,:,:); | |
tmp1=flipdim(permute(mate{5},[2 1 3 4]),2); | |
FLD(271:360,:,:,:)=tmp1(:,62:239,:,:); | |
FLD=circshift(FLD,[142 0]); | |
%extract second component: note index (and sign) shift | |
MATE=eccov4_array(mate); | |
MATE=MATE(:,62:239,:,:); | |
MATE(1:90,:,:,:)=mate{1}(:,62:239,:,:); | |
MATE(91:180,:,:,:)=mate{2}(:,62:239,:,:); | |
tmp1=flipdim(permute(fld{4},[2 1 3 4]),2); | |
MATE(181:270,:,:,:)=changeSign*tmp1(:,61:238,:,:); | |
tmp1=flipdim(permute(fld{5},[2 1 3 4]),2); | |
MATE(271:360,:,:,:)=changeSign*tmp1(:,61:238,:,:); | |
MATE=circshift(MATE,[142 0]); | |
% | |
varargout{1}=MATE; | |
end; | |
function [nameDir,nameFil]=eccov4_search(fldLoc,fldName); | |
%determine directory and file names | |
nameFil=[]; | |
if isempty(nameFil); | |
nameFil=dir(fullfile([fldLoc '*.nc'])); | |
nameDir = fileparts(fldLoc); | |
end; | |
if isempty(nameFil); | |
nameFil=dir(fullfile(fldLoc,filesep,[fldName '*.nc'])); | |
nameDir = fldLoc; | |
end; | |
if isempty(nameFil); | |
nameFil=dir(fullfile(fldLoc,filesep,fldName,filesep,[fldName '*.nc'])); | |
nameDir = fullfile(fldLoc,filesep,fldName,filesep); | |
end; | |
if mod(length(nameFil),13)~=0|length(nameFil)==0; error('did not find files matching description'); end; | |
function [fldOut]=eccov4_faces(fldIn); | |
nn=sqrt(length(fldIn)/13); | |
fldOut{1}=[]; for ii=1:nn; mm=(ii-1)*3*nn; fldOut{1}=cat(1,fldOut{1},cat(2,fldIn{mm+[1:3*nn]})); end; | |
fldOut{2}=[]; for ii=1:nn; mm=(ii-1)*3*nn+3*nn*nn; fldOut{2}=cat(1,fldOut{2},cat(2,fldIn{mm+[1:3*nn]})); end; | |
fldOut{3}=[]; for ii=1:nn; mm=(ii-1)*nn+6*nn*nn; fldOut{3}=cat(1,fldOut{3},cat(2,fldIn{mm+[1:nn]})); end; | |
fldOut{4}=[]; for ii=1:3*nn; mm=(ii-1)*nn+7*nn*nn; fldOut{4}=cat(1,fldOut{4},cat(2,fldIn{mm+[1:nn]})); end; | |
fldOut{5}=[]; for ii=1:3*nn; mm=(ii-1)*nn+10*nn*nn; fldOut{5}=cat(1,fldOut{5},cat(2,fldIn{mm+[1:nn]})); end; | |
function [FLD]=eccov4_array(fld); | |
FLD=cat(1,fld{1},fld{2},... | |
flipdim(permute(fld{4},[2 1 3 4]),2),... | |
flipdim(permute(fld{5},[2 1 3 4]),2)); | |
tmp2=flipdim(permute(fld{3},[2 1 3 4]),1); | |
FLD=cat(2,FLD,repmat(tmp2,[4 1])); | |
FLD(91:360,271:360)=NaN; |
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