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-- |
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%====================================================================== |
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% L O A D C T D P R O F . M |
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% doc: Thu Jun 17 23:17:25 2004 |
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% dlm: Fri Mar 5 15:48:54 2010 |
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% (c) 2004 ladcp@ |
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% uE-Info: 77 13 NIL 0 0 72 0 2 8 NIL ofnI |
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%====================================================================== |
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% CHANGES BY ANT: |
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% Jul 17, 2008: - removed dependence on p.nav_start, because that's |
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% not set in [loadnav.m] any more |
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% Jul 27, 2008: - nanmean() -> meannan() |
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% Jan 7, 2009: - tightened use of exist() |
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function [d,p]=loadctdprof(f,d,p,ipos,isub) |
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% function [d,p]=loadctdprof(f,d,p,ipos,isub) |
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% LADCP-2 software version 7.0 |
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% |
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% ========== THIS PART IS SPECIFIC TO LDEO CTD PROFILE DATA ============ |
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% |
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% you might want to change it to accomodate your own data format |
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% |
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% |
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% load and merges LDEO ctdfile |
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% ipos(1) : pressure |
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% ipos(2) : temperature (in situ) |
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% ipos(3) : salinity |
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% |
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% computes sound speed |
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% computes static stability |
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% |
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% Martin Visbeck, 6/10/99 |
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% revised March 2002 |
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% revised December 2002 |
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|
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% CLIVAR P02 (VANC32) CTD profiles do not contain lat/lon; |
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% threfore, they are taken from p.nav_start |
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|
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if nargin<5, isub=1; end |
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if nargin<4, ipos=[1,2,3]; end |
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|
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% read ctd data file |
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disp(['LOADCTDPROF: load CTD profile ',f.ctdprof]) |
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if ~exist(f.ctdprof,'file') |
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warn=([' LOADCTDPROF can not find ',f.ctdprof]); |
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p.warnp(size(p.warnp,1)+1,1:length(warn))=warn; |
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disp(warn) |
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return |
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end |
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[dctd,posctd]=readctd(f.ctdprof,isub,ipos); |
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|
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if length(posctd) == 2 |
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d.ctdprof_lon=posctd(2); |
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d.ctdprof_lat=posctd(1); |
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elseif p.navdata |
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d.ctdprof_lon = meannan(d.slon); |
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d.ctdprof_lat = meannan(d.slat); |
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else |
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error('do not know how to determine CTD position'); |
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end |
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d.ctdprof_z=p2z(dctd(:,1),d.ctdprof_lat); |
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d.ctdprof_p=dctd(:,1); |
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d.ctdprof_t=dctd(:,2); |
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d.ctdprof_s=dctd(:,3); |
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|
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% get N^2 |
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if exist('sw_bfrq','file') |
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d.ctdprof_N2=sw_bfrq(d.ctdprof_s,d.ctdprof_t,d.ctdprof_p,d.ctdprof_lat); |
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d.ctdprof_N2(end+1)=d.ctdprof_N2(end); |
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d.ctdprof_ss=sw_svel(d.ctdprof_s,d.ctdprof_t,d.ctdprof_p); |
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else |
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disp(' download SW routines to get soundspeed and N^2 ') |
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end |
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|
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% get maximum ctdepth |
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disp([' CTD max depth : ',int2str(max(d.ctdprof_z))]) |
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if ~isfinite(p.zpar(2)); |
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p.zpar(2)=fix(max(d.ctdprof_z)); |
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end |
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|
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|
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%==================================================================== |
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|
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function depth=p2z(p,lat) |
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% !!!!!! USES Z=0 AT P=0 (I.E. NOT 1ATM AT SEA SURFACE) |
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% pressure to depth conversion using |
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% saunders&fofonoff's method (deep sea res., |
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% 1976,23,109-111) |
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% formula refitted for alpha(p,t,s) = eos80 |
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90 |
% units: |
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% depth z meter |
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% pressure p dbars (original in bars, but below |
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93 |
% division by 10 is included) |
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% latitude lat deg |
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95 |
% checkvalue: |
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96 |
% depth = 9712.654 m |
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97 |
% for |
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98 |
% p = 1000. bars |
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% lat = 30. deg |
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% real lat,p |
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if nargin < 2, lat=54; end |
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p=p/10.; |
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x=sin(lat/57.29578); |
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104 |
x=x*x; |
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105 |
gr=9.780318*(1.0+(5.2788e-3+2.36e-5*x)*x)+1.092e-5*p; |
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106 |
depth=(((-1.82e-11*p+2.279e-7).*p-2.2512e-3).*p+97.2659).*p; |
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depth=depth./gr; |
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108 |
% |
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109 |
% |
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110 |
%==================================================================== |
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111 |
|
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function [d,pos]=readctd(file,isub,index) |
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% read CTD data |
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id=fopen(file,'r'); |
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A=fread(id); |
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fclose(id); |
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A=setstr2(A); |
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118 |
|
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119 |
pos = []; |
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120 |
|
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121 |
%%%ii=find(A(:,1)=='@'); |
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%%%A=A((ii+1):end,:); |
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123 |
|
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[lt,lv]=size(A); |
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125 |
|
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126 |
d=[]; |
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127 |
|
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128 |
if nargin<2, isub=1; end |
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129 |
|
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130 |
for i=1:isub:lt |
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d=[d;sscanf(A(i,:),'%g')']; |
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end |
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133 |
|
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if nargin>2 |
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d=d(:,index); |
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136 |
end |
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137 |
|
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138 |
|
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139 |
% ----------------------------------------------------- |
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140 |
function AR=setstr2(A,cr) |
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% function AR=setstr2(A,cr) |
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% reshape charater string vector A |
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% in record structure |
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144 |
% cr = 10 (default) |
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145 |
|
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146 |
% remove line feeds |
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ii=find(A==13); |
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148 |
A(ii)=[]; |
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149 |
|
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150 |
|
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if nargin<2, cr=10;, end |
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152 |
|
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ii=[0;find(A==cr)]; |
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154 |
|
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n=length(ii)-1; |
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m=max([diff(ii)]); |
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157 |
|
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% fill array with blanks |
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AR=ones(n,m)*32; |
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160 |
|
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161 |
for i=1:n |
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j=(ii(i)+1):(ii(i+1)-1); |
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if length(j)>0 |
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j1=j-j(1)+1; |
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AR(i,j1)=A(j)'; |
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166 |
end |
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167 |
end |
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168 |
|
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AR=setstr(AR); |
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170 |