--- a/LADCPproc.defaults
+++ b/LADCPproc.defaults
@@ -1,9 +1,9 @@
#======================================================================
# L A D C P P R O C . D E F A U L T S
# doc: Fri Sep 17 09:44:21 2010
-# dlm: Tue Aug 6 20:57:30 2013
+# dlm: Thu Sep 19 13:34:34 2013
# (c) 2010 A.M. Thurnherr
-# uE-Info: 33 66 NIL 0 0 72 0 2 4 NIL ofnI
+# uE-Info: 142 75 NIL 0 0 72 0 2 4 NIL ofnI
#======================================================================
# default parameters for [LADCPproc]
@@ -31,6 +31,7 @@
# Jun 5, 2013: - added $bad_beam
# Sep 6, 2013: - BUG: BT_begin_search_above value of 300m was correct;
# the original bug was in the documentation
+# Sep 19, 2013: - added support for $BT_range_method
#----------------------------------------------------------------------
# Data editing
@@ -117,7 +118,7 @@
# Maximum difference between water depth and average distance of echo max.,
# if $BT_min_depth and $BT_max_depth are not set. The stddev of the detected
-# water depth is added To this number.
+# water depth is added to this number.
$BT_max_depth_error = 20;
@@ -127,6 +128,21 @@
$BT_max_w_difference = 0.03;
+# When the BT velocity is taken from the wrong bin, the measurement is not
+# taken from the main acoustic beam but, rather, from a side lobe. As a
+# result, the BT measurement is biased, causing biased near-bottom LADCP
+# velocities when the instrument is moving horizontally.
+# Methods:
+# 0: Take BT velocity from bin with max(Sv). Not recommended.
+# 1: Chose either bin at max(Sv) or one of its neighbors,
+# depending which shows the smallest discrepancy between w_BT and w_reflr.
+# Causes underestimation of instrument speed in P403 tow-yos.
+# 2: Visbeck (2002): use median from 3 bins. Requires $BT_range_Visbeck_center
+# to define where the 3 bins should be centered wrt. the max(Sv) bin.
+# Visbeck suggests +1. Based on P403 tow-yo 030 it looks more like -2.
+
+$BT_range_method = 1;
+
#----------------------------------------------------------------------
# Shear Processing Parameters
#----------------------------------------------------------------------