author | A.M. Thurnherr <ant@ldeo.columbia.edu> |
Tue, 08 Jul 2014 21:50:22 -0400 | |
changeset 14 | f7f35d9629ab |
parent 0 | 0a450563f904 |
permissions | -rw-r--r-- |
0
0a450563f904
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1 |
function [ds,dr,ps,p]=getshear(d,p,ps,dr) |
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2 |
% |
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3 |
% - compute shear profiles |
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4 |
% - use only central difference |
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5 |
% - use 2*std editing |
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6 |
% |
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7 |
% Martin Visbeck, LDEO, 3/7/97 |
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8 |
|
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9 |
% resolution of final shear profile in meter |
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10 |
idz=ps.dz; |
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11 |
disp(['GETSHEAR2: average shear profile over (ps.dz) ',num2str(idz),' [m]']) |
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12 |
% average over how much percent of the data |
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13 |
ps=setdefv(ps,'shear_stdf',2); |
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14 |
stdf=ps.shear_stdf; |
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15 |
disp([' maximum std (stdf) ',num2str(stdf),' of data ']) |
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16 |
if nargin<4, dr.dummy=0; end |
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17 |
|
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18 |
% check if only one istrument is to be used |
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19 |
if ps.up_dn_looker==2 |
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20 |
% down looker only |
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21 |
d.weight(d.izu,:)=nan; |
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elseif ps.up_dn_looker==3 |
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23 |
% up looker only |
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24 |
d.weight(d.izd,:)=nan; |
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25 |
end |
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26 |
|
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27 |
% weightmin |
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28 |
ps=setdefv(ps,'shear_weightmin',0.1); |
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29 |
disp([' minimum weight ',num2str(ps.shear_weightmin),' of data ']) |
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30 |
|
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31 |
is1=sum(sum(isfinite(d.weight))); |
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w=double(d.weight>ps.shear_weightmin); |
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33 |
ii=find(w==0); |
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34 |
w(ii)=NaN; |
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is2=sum(sum(isfinite(w))); |
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36 |
disp([' will use ',int2str(is2/is1*100),' % of data ']) |
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37 |
|
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38 |
|
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39 |
% compute central shear |
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40 |
% disp([' compute central diff shear ']) |
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41 |
iiok=1:length(d.z); |
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us=[NaN*d.ru(1,iiok);diff2(d.ru(:,iiok))./diff2(d.izm);NaN*d.ru(1,iiok)].*w; |
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vs=[NaN*d.rv(1,iiok);diff2(d.rv(:,iiok))./diff2(d.izm);NaN*d.rv(1,iiok)].*w; |
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ws=[NaN*d.rw(1,iiok);diff2(d.rw(:,iiok))./diff2(d.izm);NaN*d.rw(1,iiok)].*w; |
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45 |
|
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46 |
|
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47 |
% loop over final depth profile |
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48 |
if existf(dr,'z')==1 |
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z=dr.z; |
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else |
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izmax=-min(d.z); |
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izmax=-maxnan(-[izmax,p.zbottom]); |
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z=idz*0.5:idz:izmax; |
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54 |
end |
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|
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56 |
|
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ds.usm=zeros(length(z),1)*NaN; |
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ds.vsm=ds.usm; |
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ds.wsm=ds.usm; |
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ds.use=ds.usm; |
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ds.vse=ds.usm; |
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ds.wse=ds.usm; |
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ds.nn=ds.usm; |
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ds.z=ds.usm; |
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65 |
|
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66 |
|
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il=length(z); |
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|
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69 |
|
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iv=0; |
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%disp([' average shear estimates ']) |
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72 |
for in=1:il |
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73 |
i=z(in); |
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74 |
iv =iv+1; |
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75 |
% up and down |
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76 |
i2=find(abs(-d.izm-i-idz/2) <= idz); |
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77 |
i1=i2(find(isfinite(us(i2)+vs(i2)))); |
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78 |
ds.nn(iv)=length(i1); |
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79 |
if ds.nn(iv) > 2 |
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usmm=median(us(i1)'); |
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81 |
ussd1=std(us(i1)); |
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82 |
ii=i1(find(abs(us(i1)-usmm)<stdf*ussd1)); |
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83 |
if length(ii)>1 |
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84 |
ds.usm(iv)=mean(us(ii)); |
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85 |
ds.use(iv)=std(us(ii)); |
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86 |
end |
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87 |
|
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88 |
vsmm=median(vs(i1)'); |
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89 |
vssd1=std(vs(i1)); |
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90 |
ii=i1(find(abs(vs(i1)-vsmm)<stdf*vssd1)); |
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if length(ii)>1 |
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ds.vsm(iv)=mean(vs(ii)); |
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93 |
ds.vse(iv)=std(vs(ii)); |
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94 |
end |
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95 |
|
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96 |
wsmm=median(ws(i1)'); |
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97 |
wssd1=std(ws(i1)); |
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98 |
ii=i1(find(abs(ws(i1)-wsmm)<stdf*wssd1)); |
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99 |
if length(ii)>1 |
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ds.wsm(iv)=mean(ws(ii)); |
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ds.wse(iv)=std(ws(ii)); |
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102 |
end |
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103 |
|
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104 |
% if exist('test')==1 |
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105 |
% hist(vs(ii),[-1:0.05:1]*.2e-1) |
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% title(['z = ',num2str(z(iv))]) |
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% pause(0.01) |
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108 |
% end |
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109 |
|
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end |
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111 |
|
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% save depth vector |
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ds.z(iv)=i; |
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114 |
|
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% end of shear loop |
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end |
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117 |
|
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118 |
|
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% integrate shear profile (from bottom up) |
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120 |
|
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ii=find(isnan(ds.usm)); |
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ds.usm(ii)=0; |
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ii=find(isnan(ds.vsm)); |
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ds.vsm(ii)=0; |
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ii=find(isnan(ds.wsm)); |
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ds.wsm(ii)=0; |
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|
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128 |
|
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ds.ur=flipud(cumsum(flipud(ds.usm)))*idz; |
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ds.vr=flipud(cumsum(flipud(ds.vsm)))*idz; |
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ds.wr=flipud(cumsum(flipud(ds.wsm)))*idz; |
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ds.ur=ds.ur-mean(ds.ur); |
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ds.vr=ds.vr-mean(ds.vr); |
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ds.wr=ds.wr-mean(ds.wr); |
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135 |
|
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if existf(d,'down')==1 |
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dz=2*abs(mean(diff(d.zd))); |
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fac=1/tan(d.down.Beam_angle*pi/180)*sqrt(2)*dz; |
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ds.ensemble_vel_err=ds.wse*fac; |
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dr.ensemble_vel_err=ds.wse*fac; |
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141 |
end |
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142 |
|
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if nargin>3 |
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dr.u_shear_method=ds.ur; |
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dr.v_shear_method=ds.vr; |
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dr.w_shear_method=ds.wr; |
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uds=stdnan(dr.u-mean(dr.u)-ds.ur); |
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vds=stdnan(dr.v-mean(dr.v)-ds.vr); |
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uvds=sqrt(uds.^2+vds.^2); |
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if uvds>meannan(dr.uerr) |
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warn=(' increased error because of shear - inverse difference'); |
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disp(warn) |
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if uvds>1.5*meannan(dr.uerr) & uvds>0.1 |
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p.warn(size(p.warn,1)+1,1:length(warn))=warn; |
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155 |
end |
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dr.uerr=dr.uerr/meannan(dr.uerr)*uvds/1.5; |
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157 |
end |
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158 |
end |
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159 |
|
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160 |
%-------------------------------------------------- |
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161 |
|
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function x = diff2(x,k,dn) |
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%DIFF2 Difference function. If X is a vector [x(1) x(2) ... x(n)], |
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% then DIFF(X) returns a vector of central differences between |
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% elements [x(3)-x(1) x(4)-x(2) ... x(n)-x(n-2)]. If X is a |
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% matrix, the differences are calculated down each column: |
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% DIFF(X) = X(3:n,:) - X(1:n-2,:). |
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% DIFF(X,n) is the n'th difference function. |
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169 |
|
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170 |
% J.N. Little 8-30-85 |
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% Copyright (c) 1985, 1986 by the MathWorks, Inc. |
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172 |
|
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if nargin < 2, k = 1; end |
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if nargin < 3, dn = 2; end |
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for i=1:k |
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[m,n] = size(x); |
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if m == 1 |
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x = x(1+dn:n) - x(1:n-dn); |
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179 |
else |
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x = x(1+dn:m,:) - x(1:m-dn,:); |
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181 |
end |
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182 |
end |
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183 |