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roquet |
1.1 |
function [madt]=aviso_get_madt(loc,grid_aviso) |
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% function [madt]=aviso_get_madt(loc,grid) |
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% extract madt value (mapped absolute dynamic topography) at 1 location |
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% linear interpolation in space and time at each location. |
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% |
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% loc is a structure with three array of size (N,1) : |
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% loc.lat : latitude [deg_north] |
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% loc.lon : longitude [deg_east] |
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% loc.time : date in Matlab julian date format |
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% |
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% grid is the structure returned by aviso_get_grid |
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% |
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% madt is the output array [unit: m], of size (N,1). |
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% |
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N=length(loc.lat); |
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madt=NaN*zeros(N,1); |
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Itime=interp1(grid_aviso.time,(1:grid_aviso.Ntime)'-1,loc.time); |
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Ilon=interp1(grid_aviso.NbLongitudes,(1:grid_aviso.Nlon)'-1,loc.lon); |
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Ilat=interp1(grid_aviso.NbLatitudes,(1:grid_aviso.Nlat)'-1,loc.lat); |
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[X,Y,T]=meshgrid([0 1],[0 1],[0 1]); |
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for kk=1:N, |
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if isnan(Itime(kk)*Ilon(kk)*Ilat(kk)), continue, end |
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it=floor(Itime(kk)); |
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il=floor(Ilon(kk)); |
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iL=floor(Ilat(kk)); |
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URL=sprintf('http://opendap.aviso.oceanobs.com/thredds/dodsC/dataset-duacs-dt-ref-global-merged-madt-h?Grid_0001[%d:%d][%d:%d][%d:%d]',... |
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it,it+1,il,il+1,iL,iL+1); |
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a=loaddap(URL);data=a.Grid_0001; % data.Grid_0001 : lon x lat x time |
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if any(data.Grid_0001>1e10), continue, end |
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madt(kk)=interp3(X,Y,T,data.Grid_0001/100,Ilon(kk)-il,Ilat(kk)-iL,Itime(kk)-it); |
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end |
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