author | A.M. Thurnherr <ant@ldeo.columbia.edu> |
Tue, 08 Jul 2014 21:50:22 -0400 | |
changeset 14 | f7f35d9629ab |
parent 1 | ea3f25d9ba76 |
child 19 | b0fe24d04ba8 |
permissions | -rw-r--r-- |
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%====================================================================== |
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% L O A D N A V . M |
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% doc: Thu Jun 17 18:01:50 2004 |
1 | 4 |
% dlm: Mon Jan 3 02:01:17 2011 |
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% (c) 2004 ladcp@ |
1 | 6 |
% uE-Info: 252 25 NIL 0 0 72 0 2 8 NIL ofnI |
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%====================================================================== |
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% MODIFICATIONS BY ANT: |
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% Jun 26, 2004: - totally re-wrote the file-reading, which reduces |
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% run time by over factor 90(!!!) --- 5.7 instead of |
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% 527 seconds in the test case --- for deep casts |
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% Jul 1, 2004: - added support for time bases |
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% - made input definition flexible |
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% - removed ipos argument |
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% Dec 18, 2004: - BUG: header_lines > 0 did not work |
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% Jun 9, 2005: - improved time-base comments |
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% Aug 9, 2006: - added support for elapsed-time |
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% Jan 5, 2007: - removed LADDER-1 specific code for IX_4 distribution |
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% - added Dan Torres' code to interpolate irregular |
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% GPS time series |
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% - added nav file layout into p structure |
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% Jan 17, 2007: - added support for new [geomag.m] |
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% Jan 26, 2007: - BUG: file layout default was in p (rather than f) structure |
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% Jun 30, 2008: - adapted to calculate magdev using external program geomag60 |
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% Jul 2, 2008: - BUG: missing "" in geomag command to allow spcs in |
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% cof-file path |
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% Jul 17, 2008: - moved some code to [loadctd.m] to fix bug associated with |
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% adjusting of start/end positions in case of significant |
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% ADCP vs GPS/CTD clock offset (unclear whether this happened |
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% only when elapsed time was used) |
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% Jul 27, 2008: - nanmean() -> meannan() |
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% Oct 15, 2008: - replaced mean by median to get lat/lon (bad outliers in L1 data set) |
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% Dec 1, 2009: - BUG: geomag date check was wrong (Dec 1 2009 resulted in a date >= 2010) |
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% Jan 22, 2010: - adapted to Eric Firing's much simplified magdec utility |
1 | 36 |
% Jan 3, 2011: - changed IGRF11 validity to end of 2015 (from 2010) |
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function [d,p]=loadnav(f,d,p) |
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% function [d,p]=loadnav(f,d,p) |
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|
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% This routine works for generic ASCII files, containing GPS time series, |
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% with fields time, lat and lon. |
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|
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%==================== |
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% TWEAKABLES |
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%==================== |
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|
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% PRE-AVERAGING OF GPS TIME (IN DAYS) |
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p = setdefv(p,'navtime_av',2/60/24); |
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|
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% INTERPOLATE IRREGULAR NAV TIME SERIES (Dan Torres) |
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p=setdefv(p,'interp_nav_times',0); |
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|
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% FILE LAYOUT |
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f = setdefv(f,'nav_header_lines',0); |
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f = setdefv(f,'nav_fields_per_line',3); |
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f = setdefv(f,'nav_time_field',1); |
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f = setdefv(f,'nav_lat_field',2); |
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f = setdefv(f,'nav_lon_field',3); |
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|
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% TIME BASE |
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% 0 for elapsed time in seconds |
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% 1 for year-day (1.0 = Jan 1, 00:00) |
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% 2 for Visbeck's Gregorian (see gregoria.m) |
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p = setdefv(p,'nav_time_base',0); |
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|
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%====================================================================== |
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|
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% MODIFICATIONS BY ANT: |
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% Jun 26, 2004: - totally re-wrote the file-reading, which reduces |
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% run time by over factor 90(!!!) --- 5.7 instead of |
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% 527 seconds in the test case --- for deep casts |
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% Jul 1, 2004: - added support for time bases |
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% - made input definition flexible |
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% - removed ipos argument |
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% Dec 18, 2004: - BUG: header_lines > 0 did not work |
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% Jun 9, 2005: - improved time-base comments |
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% Aug 9, 2006: - added support for elapsed-time |
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% Jan 5, 2007: - removed LADDER-1 specific code for IX_4 distribution |
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% - added Dan Torres' code to interpolate irregular |
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% GPS time series |
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% - added nav file layout into p structure |
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% Jan 17, 2007: - added support for new [geomag.m] |
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% Jan 26, 2007: - BUG: file layout default was in p (rather than f) structure |
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% Jan 7, 2009: - tightened use of exist() |
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|
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disp(['LOADNAV: load NAV time series ',f.nav]) |
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if ~exist(f.nav,'file') |
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disp([' can not find ',f.nav]) |
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return |
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end |
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|
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% construct input format |
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cur_field = 1; input_format = ''; |
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for i=1:f.nav_fields_per_line |
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switch i, |
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case f.nav_time_field, |
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i_time = cur_field; cur_field = cur_field + 1; |
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input_format = [input_format ' %g']; |
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case f.nav_lat_field |
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i_lat = cur_field; cur_field = cur_field + 1; |
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input_format = [input_format ' %g']; |
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case f.nav_lon_field |
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i_lon = cur_field; cur_field = cur_field + 1; |
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input_format = [input_format ' %g']; |
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106 |
otherwise |
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107 |
input_format = [input_format ' %*g']; |
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108 |
end |
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109 |
end |
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110 |
if cur_field ~= 4 |
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111 |
error('File format definition error'); |
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112 |
end |
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|
113 |
|
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114 |
% open input & skip header |
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115 |
header_lines = f.nav_header_lines; |
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116 |
fp=fopen(f.nav); |
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|
117 |
while header_lines > 0 |
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118 |
fgets(fp); |
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119 |
header_lines = header_lines - 1; |
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120 |
end |
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|
121 |
|
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122 |
% read time series |
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|
123 |
[A,nread] = fscanf(fp,input_format,[3,inf]); |
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124 |
|
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125 |
% close file |
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126 |
fclose(fp); |
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127 |
|
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|
128 |
% NAV time |
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|
129 |
d.navtime_jul=A(i_time,:)'; |
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130 |
switch f.nav_time_base |
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131 |
case 0 % elapsed time in seconds |
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132 |
d.navtime_jul = d.navtime_jul/24/3600 + julian(p.time_start); |
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133 |
case 1 % year-day |
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|
134 |
d.navtime_jul = d.navtime_jul + julian([p.time_start(1) 1 0 0 0 0]); |
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|
135 |
end |
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|
136 |
|
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|
137 |
disp([' number of NAV scans: ',int2str(length(d.navtime_jul)),... |
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|
138 |
' delta t : ',num2str(median(diff(d.navtime_jul))*24*3600),' seconds']) |
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|
139 |
|
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|
140 |
%---------------------------------------- |
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|
141 |
% interpolate to regular time series |
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|
142 |
% code provided by Dan Torres |
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|
143 |
%---------------------------------------- |
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|
144 |
|
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|
145 |
if p.interp_nav_times |
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|
146 |
min_t = min(d.navtime_jul); |
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|
147 |
max_t = max(d.navtime_jul); |
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|
148 |
delta_t = median(diff(d.navtime_jul)); |
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|
149 |
data = interp1q(d.navtime_jul,A([i_lat i_lon],:)',[min_t:delta_t:max_t]'); |
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|
150 |
d.navtime_jul = [min_t:delta_t:max_t]'; |
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|
151 |
disp(sprintf(' interpolated to %d NAV scans; delta_t = %.2f seconds',... |
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|
152 |
length(d.navtime_jul),median(diff(d.navtime_jul))*24*3600)); |
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|
153 |
else |
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|
154 |
data=A([i_lat i_lon],:)'; |
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|
155 |
end |
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|
156 |
|
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|
157 |
p.navdata = 1; |
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|
158 |
d.slat = data(:,1); |
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|
159 |
d.slon = data(:,2); |
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|
160 |
|
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|
161 |
% ================================================================= |
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|
162 |
% - at this point nav data is in d.navtime_jul, d.slon, d.slat |
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|
163 |
% and p.navdata is set to 1 |
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|
164 |
% - time shifting & extraction of begin/end position is handled |
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|
165 |
% in [loadctd.m] |
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|
166 |
% ================================================================= |
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|
167 |
|
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|
168 |
if ~isfinite(p.drot) % set magdecl |
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|
169 |
[s,o] = system('magdec'); |
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|
170 |
if s == 1 |
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|
171 |
p.drot = geomag(f,meannan(d.navtime_jul),medianan(d.slat),medianan(d.slon)); |
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|
172 |
else |
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|
173 |
warn = sprintf('"magdec" not found; using old magdev code with IGRF00',f.IGRF); |
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|
174 |
disp(['WARNING: ' warn]); |
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|
175 |
p.warn(size(p.warn,1)+1,1:length(warn))=warn; |
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|
176 |
p.drot = magdev(medianan(d.slat),medianan(d.slon)); |
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|
177 |
end |
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|
178 |
[d.ru,d.rv]=uvrot(d.ru,d.rv,p.drot); |
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|
179 |
[d.bvel(:,1),d.bvel(:,2)]=uvrot(d.bvel(:,1),d.bvel(:,2),p.drot); |
0a450563f904
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|
180 |
disp(sprintf(' corrected for magnetic declination of %.1f deg',p.drot)); |
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|
181 |
end |
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|
182 |
|
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|
183 |
% ================================================================ |
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|
184 |
|
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|
185 |
function depth=p2z(p,lat) |
0a450563f904
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|
186 |
% !!!!!! USES Z=0 AT P=0 (I.E. NOT 1ATM AT SEA SURFACE) |
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|
187 |
% pressure to depth conversion using |
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diff
changeset
|
188 |
% saunders&fofonoff's method (deep sea res., |
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|
189 |
% 1976,23,109-111) |
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diff
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|
190 |
% formula refitted for alpha(p,t,s) = eos80 |
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|
191 |
% units: |
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|
192 |
% depth z meter |
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|
193 |
% pressure p dbars (original in bars, but below |
0a450563f904
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diff
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|
194 |
% division by 10 is included) |
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|
195 |
% latitude lat deg |
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|
196 |
% checkvalue: |
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|
197 |
% depth = 9712.654 m |
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|
198 |
% for |
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|
199 |
% p = 1000. bars |
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diff
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|
200 |
% lat = 30. deg |
0a450563f904
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|
201 |
% real lat,p |
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diff
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|
202 |
if nargin < 2, lat=54; end |
0a450563f904
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|
203 |
p=p/10.; |
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|
204 |
x=sin(lat/57.29578); |
0a450563f904
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|
205 |
x=x*x; |
0a450563f904
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|
206 |
gr=9.780318*(1.0+(5.2788e-3+2.36e-5*x)*x)+1.092e-5*p; |
0a450563f904
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|
207 |
depth=(((-1.82e-11*p+2.279e-7).*p-2.2512e-3).*p+97.2659).*p; |
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|
208 |
depth=depth./gr; |
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|
209 |
% |
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|
210 |
|
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|
211 |
function a=datestrj(b) |
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% print julian date string |
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a=datestr(b-julian([0 1 0 0 0 0])); |
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%============================================================== |
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function [hours]=hms2h(h,m,s); |
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%HMS2H converts hours, minutes, and seconds to hours |
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% Usage: [hours]=hms2h(h,m,s); or [hours]=hms2h(hhmmss); |
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if nargin== 1, |
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hms=h; |
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h=floor(hms/10000); |
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ms=hms-h*10000; |
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m=floor(ms/100); |
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s=ms-m*100; |
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hours=h+m/60+s/3600; |
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else |
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hours=h+(m+s/60)/60; |
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end |
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%=============================================================== |
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function dev=geomag(f,date,lat,lon); |
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% function dev=geomag(f,date,lat,lon); |
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% call SOEST magdec to compute magnetic deviation |
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% INSTALLATION INSTRUCTIONS: |
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% - src available as "geomag" at http://currents.soest.hawaii.edu/hg/hgwebdir.cgi |
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% - on UNIX systems (I tested Linux, MacOSX & FreeBSD), |
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% 1) compile by typing "make" or "gmake" in source directory |
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% 2) install by typing "make install" or "gmake install" as root |
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% 3) test by executing matlab command "system('magdec')" |
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% if this test produces an error and a return value of 127, |
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% the path is not set correctly |
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dstr = gregoria(date); % convert date (approx) |
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year = dstr(1); month = dstr(2); day = dstr(3); |
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if (year < 1900 || year > 2015) |
0
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error(sprintf('year = %d out of range',year)); |
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end |
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% execute external program |
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CMD = sprintf('magdec %g %g %d %d %d',lon,lat,year,month,day); |
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disp(sprintf('executing %s',CMD)); |
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[status,work] = system(CMD); |
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if status ~= 0 |
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error(['cannot execute <' CMD '>']); |
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end |
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|
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vals = sscanf(work,'%g'); % parse output |
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if length(vals) ~= 4 |
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error(['unexpected output from <' CMD '>']); |
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end |
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dev = vals(1); % return result |