Description Usage Format Details Source Examples
Data from calibrated field trials in Mission Bay, CA.
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A data frame with 3,020 observations on the following 27 variables.
date
a Date
time
a POSIXlt
year
year
month
month
day
day
hour
hour
minute
minute
second
second
speed
calibrated speed (meters per second)
depth
depth (meters)
mx_raw
a numeric vector of magnetometer X-axis values (in bits)
my_raw
a numeric vector of magnetometer Y-axis values (in bits)
mz_raw
a numeric vector of magnetometer Z-axis values (in bits)
ax_raw
a numeric vector of accelerometer X-axis values (in bits)
ay_raw
a numeric vector of accelerometer Y-axis values (in bits)
az_raw
a numeric vector of accelerometer Z-axis values (in bits)
mx_scaled
a numeric vector of calibrated magnetometer X-axis values scaled from -1 to +1
my_scaled
a numeric vector of calibrated magnetometer Y-axis values scaled from -1 to +1
mz_scaled
a numeric vector of calibrated magnetometer Z-axis values scaled from -1 to +1
ax_scaled
a numeric vector of calibrated accelerometer X-axis values scaled from -1 to +1
ay_scaled
a numeric vector of calibrated accelerometer Y-axis values scaled from -1 to +1
az_scaled
a numeric vector of calibrated accelerometer Z-axis values scaled from -1 to +1
roll
roll values in radians (-π to +π)
pitch
pitch values in radians (-π/2 to +π/2)
heading_mag
magnetic heading direction in radians (0 - 2π)
heading_geo
geographic heading (corrected for declination) direction in radians (0 - 2π)
trial
trial number, 1-4
Four trials were conducted in which an instrument that was recording speed, magnetic fields, acceleration, depth, and time was towed behind a boat to a series of known locations. During each trial, the boat returned to the starting location after a short trip.
These data were recorded with great seamanship by Bill Hagey and Randall Davis
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