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Each individual bathymetric transect was examined to detect and remove any obvious outliers from the raw files that were either shallower than the echo sounder blanking interval or deeper than a user defined cutoff value.
A smoothing operation was then performed on the corrected bathymetric data using a LOWESS filter on the z-coordinate in the alongeline direction to reduce high freqency fluctuations from interferences, such as seaween, and the effect of vehicle pitch and roll on the bed elevation. A moving, non-overlapping window size of seven data points was used, regardless of the length of the profile line. A simple polynomial regression function was used to extrapolate data at both ends of the line where less than seven data points exist.
Sample of data_04/ew_enviro_cnd_04.xls: YYYY MM DD hh mm WD WSPD GST WVHT DPD BARO ATMP WTMP DEWP PTDY 2004 9 1 0 20 260 7 8 MM MM 1014 13.9 11.4 12.4 MM ... 2004 9 14 20 50 290 3 4 0.7 6 1015.9 13.6 11.6 10 0.8 Sample of data_05/ew_enviro_cnd_05.xls: YYYY MM DD hh mm WD WSPD GST WVHT DPD BARO ATMP WTMP DEWP PTDY 2005 3 1 0 20 170 1 4 MM MM 1011.3 8.7 8.4 7.7 MM ... 2005 3 22 17 50 30 7 8 0.5 3 1010.7 7.6 8.7 2 -1 Sample of data_06/ew_enviro_cnd_06.xls: YYYY MM DD hh mm WD WSPD GST WVHT DPD BARO ATMP WTMP DEWP PTDY 2006 9 1 0 0 219 1.7 2 0.15 4 1022.6 14.8 13.6 12.2 ... 2006 9 30 23 30 212 4.5 6.1 99 99 1014.7 13.1 11.3 999
Bathymetry XYZ ASCII files with X(UTM, m), Y(UTM, m), Depth(m, MLLW)
Sample of data_04/septb/bathy/ew04_line012_b.xyz:
291671.54 130704.64 0.34
...
292034.68 131241.27 -13.62
Sample of data_06/septb/bathy/ew06_line232_b.xyz:
298770.67 131052.24 0.35
...
299234.09 131601.74 -9.67
Topography XYZ ASCII files with X(UTM, m), Y(UTM, m), Elevation(m, MLLW)
Sample of data_04/septb/bathy/ew04_line012_t.xyz:
291647.66 130677.12 0.83
...
291644.45 130671.83 1.67
Sample of of data_06/septb/topo/ew06_line232_t.xyz:
298773.09 131064.48 -0.04
...
298747.86 131035.10 3.53
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