EVBottomDetection: Bottom Detection

In AustralianAntarcticDivision/EchoviewR: Control of Echoview via COM

Bottom Detection

Description

This function runs a bottom detection on an echogram Bottom algorithms and settings are explained in the [Echoview Help File]('https://support.echoview.com/WebHelp/Reference/Algorithms/Line_picking_algorithm.htm')

Usage

EVBottomDetection(
  EVFile,
  EVVar,
  LineName = "Bottom",
  algorithm = NULL,
  StartDepth = NULL,
  StopDepth = NULL,
  MinSv = NULL,
  UseBackstep = NULL,
  DiscriminationLevel = NULL,
  BackstepRange = NULL,
  PeakThreshold = NULL,
  MaxDropouts = NULL,
  WindowRadius = NULL,
  MinPeakAssymmetry = NULL,
  replaceOldBottom = TRUE,
  SpanGaps = TRUE
)

Arguments

EVFile	An Echoview file COM object
EVVar	An Echoview Variable, accepts inputs as Character, list or Variable object (COMIDispatch)
LineName	Character of the output name for the detected Line
algorithm	numeric [0 - 2] Defines which bottom detection algorithm should be used: 0 for Delta Sv, 1 for Maximum Sv, 2 for Best bottom Candidate
StartDepth	numeric [m] Minimum bottom detection depth
StopDepth	numeric [m] maximum bottom detection detpth
MinSv	numeric [dB] minimum detection Sv
UseBackstep	Boolean [True or False]
DiscriminationLevel	numeric [dB] Minimum discrimination threshold
BackstepRange	numeric [m] Backstep range
PeakThreshold	numeric [dB] Threshold for peak detection
MaxDropouts	numeric [samples] Maximum number of dropout samples before bottom detection fails
WindowRadius	numeric [samples] Search window size
MinPeakAssymmetry	numeric
replaceOldBottom	Boolean (TRUE or FALSE) If TRUE and a line with the same name as LineName already exists, the old line will be overwritten with the new one
SpanGaps	Boolean (TRUE or FALSE) Decides wheteher span gaps is activated or notm default=TRUE

References

http://support.echoview.com/WebHelp/Echoview.htm/

Examples

## Not run: 
#To be added - Needs Example data
#Starting Echoview
echoview = StartEchoview()
#Create a new EV File
EVFile <- EVCreateNew(EVAppObj=echoview, dataFiles = "rawfile.raw")$EVFile
Varname <- "Fileset 1: Sv pulse compressed wideband pings T1"
bottom <- EVBottomDetection(EVFile, EVVar=Varname, LineName="Bottom")
# Change the algorithm to Best bottom candidate
bottom <- EVBottomDetection(EVFile, EVVar=Varname, LineName="Bottom",algorithm=2)

## End(Not run)

AustralianAntarcticDivision/EchoviewR documentation built on May 14, 2024, 10:32 a.m.