author | A.M. Thurnherr <ant@ldeo.columbia.edu> |
Fri, 14 Jan 2011 21:38:18 +0000 | |
changeset 1 | 54222c82435f |
parent 0 | de00d0f32431 |
child 2 | 16726a31a399 |
permissions | -rw-r--r-- |
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de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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#====================================================================== |
de00d0f32431
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# L A D C P P R O C . B A C K S C A T T E R |
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# doc: Wed Oct 20 13:02:27 2010 |
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# dlm: Fri Dec 10 00:35:45 2010 |
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de00d0f32431
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# (c) 2010 A.M. Thurnherr |
1 | 6 |
# uE-Info: 12 52 NIL 0 0 72 2 2 4 NIL ofnI |
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#====================================================================== |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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|
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# HISTORY: |
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# Oct 20, 2010: - created |
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# Dec 10, 2010: - BUG: backscatter above sea surface made code bomb |
|
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# when run with uplooker data |
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||
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de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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#---------------------------------------------------------------------- |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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# Volume Scattering Coefficient, following Deines (IEEE 1999) |
de00d0f32431
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# NOTES: |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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# - instrument specific! (300kHz Workhorse) |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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# - no sound-speed correction applied |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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# - R in bin center, instead of last quarter |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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# - transmit power assumes 33V batteries |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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#---------------------------------------------------------------------- |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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# NB: |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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# - correction seems to work for a subset of bins (~bins 3-9 for |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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# 2010 P403 station 46) |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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26 |
# - this may imply that noise level depends on bin |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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# - far bins are important for seabed detection, i.e. cannot simply |
de00d0f32431
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# be discarded at this stage |
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A.M. Thurnherr <athurnherr@yahoo.com>
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|
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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sub log10 { |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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my $n = shift; |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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return log($n)/log(10); |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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} |
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|
de00d0f32431
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sub Sv($$$$$) |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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{ |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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my($temp,$PL,$Er,$R,$EA) = @_; |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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my($C) = -143; # RDI Workhorse monitor |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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my($Ldbm) = 10 * log10($PL); |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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my($PdbW) = 14.0; |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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my($alpha) = 0.069; |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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my($Kc) = 0.45; |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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|
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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return $C + 10*log10(($temp+273)*$R**2) - $Ldbm - $PdbW |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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+ 2*$alpha*$R + $Kc*($EA-$Er); |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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} |
de00d0f32431
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|
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sub mk_backscatter_profs($$) |
de00d0f32431
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{ |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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my($LADCP_start,$LADCP_end) = @_; |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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|
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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my(@Er) = (1e99,1e99,1e99,1e99); # echo intensity reference level |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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for (my($ens)=$LADCP_start; $ens<=$LADCP_end; $ens++) { |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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$Er[0] = $LADCP{ENSEMBLE}[$ens]->{ECHO_AMPLITUDE}[$LADCP{N_BINS}-1][0] |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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if ($LADCP{ENSEMBLE}[$ens]->{ECHO_AMPLITUDE}[$LADCP{N_BINS}-1][0] < $Er[0]); |
de00d0f32431
initial version to process P403 yoyo
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$Er[1] = $LADCP{ENSEMBLE}[$ens]->{ECHO_AMPLITUDE}[$LADCP{N_BINS}-1][1] |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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if ($LADCP{ENSEMBLE}[$ens]->{ECHO_AMPLITUDE}[$LADCP{N_BINS}-1][1] < $Er[1]); |
de00d0f32431
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$Er[2] = $LADCP{ENSEMBLE}[$ens]->{ECHO_AMPLITUDE}[$LADCP{N_BINS}-1][2] |
de00d0f32431
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if ($LADCP{ENSEMBLE}[$ens]->{ECHO_AMPLITUDE}[$LADCP{N_BINS}-1][2] < $Er[2]); |
de00d0f32431
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$Er[3] = $LADCP{ENSEMBLE}[$ens]->{ECHO_AMPLITUDE}[$LADCP{N_BINS}-1][3] |
de00d0f32431
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if ($LADCP{ENSEMBLE}[$ens]->{ECHO_AMPLITUDE}[$LADCP{N_BINS}-1][3] < $Er[3]); |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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} |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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print(STDERR "\n\t\@per-beam noise levels = @Er") if ($opt_d); |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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|
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A.M. Thurnherr <athurnherr@yahoo.com>
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for (my($ens)=$LADCP_start; $ens<=$LADCP_end; $ens++) { |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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for (my($bin)=0; $bin<$LADCP{N_BINS}; $bin++) { |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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my($gi) = int(&depthOfBin($ens,$bin) / $GRID_DZ); |
1 | 68 |
next if ($gi < 0); |
0
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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my($range_to_bin) = &dzToBin($ens,$bin) / cos(rad($LADCP{BEAM_ANGLE})); |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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$sSv[$gi][$bin] += Sv($LADCP{ENSEMBLE}[$ens]->{CTD_TEMP}, |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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$LADCP{TRANSMITTED_PULSE_LENGTH}, |
de00d0f32431
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$Er[0],$range_to_bin, |
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A.M. Thurnherr <athurnherr@yahoo.com>
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$LADCP{ENSEMBLE}[$ens]->{ECHO_AMPLITUDE}[$bin][0])/4 + |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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Sv($LADCP{ENSEMBLE}[$ens]->{CTD_TEMP}, |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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$LADCP{TRANSMITTED_PULSE_LENGTH}, |
de00d0f32431
initial version to process P403 yoyo
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$Er[1],$range_to_bin, |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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$LADCP{ENSEMBLE}[$ens]->{ECHO_AMPLITUDE}[$bin][1])/4 + |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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Sv($LADCP{ENSEMBLE}[$ens]->{CTD_TEMP}, |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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$LADCP{TRANSMITTED_PULSE_LENGTH}, |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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$Er[2],$range_to_bin, |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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$LADCP{ENSEMBLE}[$ens]->{ECHO_AMPLITUDE}[$bin][2])/4 + |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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Sv($LADCP{ENSEMBLE}[$ens]->{CTD_TEMP}, |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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$LADCP{TRANSMITTED_PULSE_LENGTH}, |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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$Er[3],$range_to_bin, |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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$LADCP{ENSEMBLE}[$ens]->{ECHO_AMPLITUDE}[$bin][3])/4; |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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$nSv[$gi][$bin]++; |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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} |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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88 |
} |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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} |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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|
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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sub depthOfGI($) { return $_[0]*$GRID_DZ + $GRID_DZ/2; } # depth corresponding to particular grid index |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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|
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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sub find_backscatter_seabed($) |
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A.M. Thurnherr <athurnherr@yahoo.com>
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{ |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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my($search_below) = @_; |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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96 |
my($mdgi) = int($search_below/$GRID_DZ); # grid index to begin search |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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my(@wdepth_gi); # water_depth indices |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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98 |
|
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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print(STDERR "\n\tseabed-max grid indices:") if ($opt_d); |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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100 |
|
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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101 |
for (my($bin)=0; $bin<$LADCP{N_BINS}; $bin++) { # find backscatter min/max below $search_below in each bin |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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102 |
my($min,$max,$gimax,$lastvalid) = (1e99,-1e99,-1,-1); |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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for (my($gi)=$mdgi; $gi<@nSv; $gi++) { |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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next unless ($nSv[$gi][$bin] > 0); |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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105 |
my($avg) = $sSv[$gi][$bin] / $nSv[$gi][$bin]; |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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106 |
$lastvalid = $gi; |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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107 |
$min = $avg if ($avg < $min); |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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108 |
$max = $avg, $gimax = $gi if ($avg > $max); |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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109 |
} |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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110 |
if ($max-$min>10 && $gimax!=$lastvalid) { # ignore boundary maxima & scatter |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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111 |
printf(STDERR " %d",$gimax-$mdgi) if ($opt_d); |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
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112 |
push(@wdepth_gi,$gimax); |
de00d0f32431
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A.M. Thurnherr <athurnherr@yahoo.com>
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113 |
} |
de00d0f32431
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|
114 |
} |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
parents:
diff
changeset
|
115 |
|
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
parents:
diff
changeset
|
116 |
return (depthOfGI(avg(@wdepth_gi)),stddev(@wdepth_gi)*$GRID_DZ); |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
parents:
diff
changeset
|
117 |
|
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
parents:
diff
changeset
|
118 |
} |
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
parents:
diff
changeset
|
119 |
|
de00d0f32431
initial version to process P403 yoyo
A.M. Thurnherr <athurnherr@yahoo.com>
parents:
diff
changeset
|
120 |
1; |