decom.weibull: decom.weibull

In waveformlidar: Waveform LiDAR Data Processing and Analysis

Description

The function allows you to fit waveforms with the Weibull function and get parameters estimated.

Usage

decom.weibull(x, smooth = TRUE, thres = 0.22, width = 3)

Arguments

x	is a waveform with a index at the begining and followed with intensities.
smooth	is tell whether you want to smooth the waveform to remove some obvious outliers. Default is TRUE.
thres	is to determine if the detected peak is the real peak whose intensity should be higher than threshold*maximum intensity. Default is 0.22.
width	width of moving window.Default is 3, must be odd integer between 1 and n.This parameter ONLY work when the smooth is TRUE.

Value

A list contains estimates of A (amplitude parameter), u (location parameter), sigma (scale parameter) and k (shape parameter) after decomposition. these parameters are different from the adaptive Gaussian and Gaussian decomposition.

References

Tan Zhou, and Sorin C. Popescu, 2017. Bayesian decomposition of full waveform LiDAR data with uncertainty analysis. Remote Sensing of Environment 200 (2017): 43-62.

Examples

##import return waveform data
data(return)
lr<-nrow(return)
ind<-c(1:lr)
return<-data.frame(ind,return)
x<-return[1,] ###must be a dataset including intensity with index at the beginning.
r1<-decom.weibull(x)

r2<-decom.weibull(return[2,])


# for the whole dataset
dr3<-apply(return,1,decom.weibull)
dd<-return[10:20,]
dr4<-apply(dd,1,decom.weibull)

waveformlidar documentation built on Aug. 1, 2020, 5:07 p.m.