metadata slot
contains various items relating to the dataset, including source file name,
sampling rate, velocity resolution and scale, etc. The
processingLog is in standard form and needs little comment. The
data slot holds a numeric matrix v of velocities in m/s, with
the first index indicating time and the second indicating beam number. The
meanings of the beams depends on whether the object is in beam
coordinates, frame coordinates, or earth coordinates. The data slot
also contains identically-dimensioned raw matrices a and q,
holding measures of signal strength and data quality quality, respectively.
It also contains a series of vectors, e.g. time, temperature
and pressure, etc., depending on what sensors are included in the
package. For all of these quantities, the details can be different for
different instrument types, and it is assumed that the user will be
familiar with the details.Data may be extracted with [[,adv-method and inserted
with [[<-,adv-method. Type ?"[[,adv-method"
or ?"[[<-,adv-method" to learn more.
read.oce will usually read the data. If not, one may use the
general ADV function read.adv or specialized variants
read.adv.nortek, read.adv.sontek.adr or
read.adv.sontek.text. ADV data may be plotted with plot.adv function, which is a
generic function so it may be called simply as plot(x), where
x is an object inheriting from adv-class.
Statistical summaries of ADV data are provided by the generic function
summary.adv.
Conversion from beam to xyz coordinates may be done with
beamToXyzAdv, and from xyz to enu (east north up) may be done
with xyzToEnuAdv. toEnuAdv may be used to
transfer either beam or xyz to enu. Enu may be converted to other
coordinates (e.g. aligned with a coastline) with
enuToOtherAdv.
data(adv)
adv[["v"]] <- 0.001 + adv[["v"]] # add 1mm/s to all velocity componentsRun the code above in your browser using DataLab