zoc {diveMove} | R Documentation |
Correct zero-offset in TDR records, with the aid of a graphical user interface (GUI), allowing for dynamic selection of offset and multiple time windows to perform the adjustment.
zoc(time, depth, offset) plotDive(time, depth, vel=NULL, xlim=NULL, phaseCol=NULL)
time |
chron object with date and time. |
depth |
numeric vector with depth in m. |
offset |
known amount of meters for zero-offset correcting depth throughout the entire TDR record. |
vel |
numeric vector with velocity in m/s. |
xlim |
vector of length 2, with lower and upper limits of time to be plotted. |
phaseCol |
factor dividing rows into sections. |
These functions are used primarily to correct, visually, drifts
in the pressure transducer of TDR records. zoc
calls
plotDive
, which plots depth and, optionally, velocity vs. time
with the possibility zooming in and out on time, changing maximum
depths displayed, and panning through time. The option to zero-offset
correct sections of the record gathers x and y coordinates for two
points, obtained by clicking on the plot region. The first point
clicked indicates the offset and beginning time of section to correct,
and the second one indicates the ending time of the section to
correct. Multiple sections of the record can be corrected in this
manner, by panning through the time and repeating the procedure. In
case there's overlap between zero offset corrected windows, the last
one prevails.
Once the whole record has been zero-offset corrected, remaining points with depth values lower than zero, are turned into zeroes, as these are assumed to be values at the surface.
zoc
returns a numeric vector, as long as depth
of
zero-offset corrected depths.
plotDive
returns a list with as many components as sections of
the record that were zero-offset corrected, each consisting of two
further lists with the same components as those returned by
locator
.
Sebastian P. Luque spluque@gmail.com, with many ideas from CRAN package sfsmisc.