beamToXyzAdpAD2CP {oce}R Documentation

Convert AD2CP-style adp data From Beam to XYZ Coordinates

Description

This looks at all the items in the data slot of x, to see if they contain an array named v that holds velocity. If that velocity has 4 components, and if oceCoordinate for the item is "beam", then along-beam velocity components B1 B1, B3, and B4 are converted to instrument-oriented Cartesian velocity components u v and w using the convex-geometry formulae from section 5.5 of reference [1], viz. u=a*(B1-B2), v=a*(B4-B3), w=-b*(B1+B2+B3+B4). In addition to these, an estimate of the error in velocity is computed as e=d*(B1+B2-B3-B4). The geometrical factors in these formulae are: a=1/(2*sin(theta)) where theta is the angle the beams make to the axial direction (which is available as x[["beamAngle"]]), b=1/(4*cos(theta)), and d=a/sqrt(2).

Usage

beamToXyzAdpAD2CP(x, debug = getOption("oceDebug"))

Arguments

x

an object of class "adp", e.g. created by read.adp.ad2cp or by other functions that end up calling this function.

debug

an integer specifying whether debugging information is to be printed during the processing. This is a general parameter that is used by many oce functions. Generally, setting debug=0 turns off the printing, while higher values suggest that more information be printed. If one function calls another, it usually reduces the value of debug first, so that a user can often obtain deeper debugging by specifying higher debug values.

References

1. Teledyne RD Instruments. “ADCP Coordinate Transformation: Formulas and Calculations,” January 2010. P/N 951-6079-00.

See Also

Other things related to adp data: [[,adp-method, [[<-,adp-method, ad2cpHeaderValue, adp-class, adpEnsembleAverage, adp, as.adp, beamName, beamToXyzAdp, beamToXyzAdv, beamToXyz, beamUnspreadAdp, binmapAdp, enuToOtherAdp, enuToOther, handleFlags,adp-method, is.ad2cp, plot,adp-method, read.adp.ad2cp, read.adp.nortek, read.adp.rdi, read.adp.sontek.serial, read.adp.sontek, read.adp, read.aquadoppHR, read.aquadoppProfiler, read.aquadopp, rotateAboutZ, setFlags,adp-method, subset,adp-method, summary,adp-method, toEnuAdp, toEnu, velocityStatistics, xyzToEnuAdpAD2CP, xyzToEnuAdp, xyzToEnu

[Package oce version 1.1-1 Index]