Figure 1.
Subset of “perfect” data set to be corrupted and used as reference to measure performance of the “filter” method for zero offset correction (A), and corrupted data set to be used as input (B).
Figure 2.
Result of filtering method for zero offset correction of diving depth time series.
Corrupted input time series (A), first filter (median) using a moving window of size 12 (1 min) and second filter (0.35 quantile) using moving window of size 720 (1 h) (B), and corrected depth (corrupted series minus last filter) (C). The y-axis limits are restricted to be approximately equal to the range of surface depth in the time series for clarity.
Figure 3.
Probability density (A) and “Q-Q” deviations (m) of corrected depth time series from the original, clean, data set (black solid line), and that of normal Gaussian noise (red solid line) introduced into the original time series (,
m) (B).
Figure 4.
Zero offset correction of TDR data from a leatherback turtle.
Input time series (A), first filter (median) using a moving window of size 3 (3 s) and second filter (0.05 quantile) using moving window of size 120 (2 min) (B), and corrected depth (input series minus last filter) (C). The y-axis limits are restricted to be approximately equal to the range of surface depth in the time series for clarity.
Figure 5.
Zero offset correction of TDR data from a Cassin's auklet.
Input time series (A), first filter (median) using a moving window of size 3 (9 s) and second filter (0.05 quantile) using moving window of size 180 (9 min) (B), and corrected depth (input series minus last filter) (C). The y-axis limits are restricted to be approximately equal to the range of surface depth in the time series for clarity.
Figure 6.
Zero offset correction of TDR data from a king penguin.
Input time series (A), first filter (median) using a moving window of size 11 (11 s) and second filter (0.3 quantile) using moving window of size 120 (120 s) (B), and corrected depth (input series minus last filter) (C). The y-axis limits are restricted to be approximately equal to the range of surface depth in the time series for clarity.
Figure 7.
Comparison of ZOC adjusted and unadjusted TDR data from a short-finned pilot whale.
Input time series (A), corresponding to period presented in [11], and corrected depth (B). The y-axis limits are restricted to the top 35 m of this period for clarity. Date and time on x-axis were set arbitrarily because input consists of seconds.