npeaks: npeaks

In tankwin08/waveformlidar: Waveform LiDAR Data Processing and Analysis

Description

The function allows you to briefly know how many peaks you have in a waveform

Usage

npeaks(y, drop = c(0, 0), smooth = TRUE, threshold = 0.2)

Arguments

y	is the waveform intensities.
drop	is the index of waveform index we should ingore or non-intensity of waveform information.Default is c(0,0) that means use the all input data.
smooth	is tell whether you want to smooth the waveform to reduce the effect of some obvious noise. Default is TRUE.
threshold	is to determine if the detected peak is the real peak whose intensity should be higher than threshold*maximum intensity. Default is 0.2.

Value

return the number of waveform componments.

Examples

##import return waveform data
data(return)
###individual waveform
  x<-return[1,]
  npeaks(x)
  npeaks(x,smooth=FALSE) ##it will use the raw data to detect peaks
  #you can set up threshold to determine if peaks are correctly identified.
  npeaks(x,smooth=FALSE,threshold=0.25)
###if there are some columns are not intensity, you can delete before you process
   y<-c(c(1,2,3),as.numeric(x))
   npeaks(y,drop=c(1,3))

tankwin08/waveformlidar documentation built on Sept. 26, 2020, 10:05 p.m.