hiPassThresh: Using high-pass filter and thresholds to filter image

In raff-k/Lslide: Functions for object-oriented image analysis in landslide science

Using high-pass filter and thresholds to filter image

Description

This function performs a high-pass filter followed by a thresholding procedure in order to select specific cluster of cells.

Usage

hiPassThresh(x, scale.factor, threshold, path.output = NULL,
  do.sieve = TRUE, sieve.mode = "0", sieve.thresh = 4,
  do.shrink.expand = TRUE, expand = 4, do.buf = FALSE,
  buf.size = 1, do.use.temp.HPF = FALSE, do.use.temp.Thresh = FALSE,
  path.save = tempdir(), NoData = -99999, env.rsaga = NULL,
  show.output.on.console = FALSE, quiet = TRUE, ...)

Arguments

x	raster object or input path of file
scale.factor	scale factor
threshold	threshold
path.output	= NULL
do.sieve	= TRUE
sieve.mode	mode of cell-neighborhood, Neumann [0]: the four horizontally and vertically neighboured cells; Moore [1]: all eight adjacent cells. Default: "0"
sieve.thresh	minimum number of cells in a group of adjacent cells (minimum 2). Default: 4
do.shrink.expand	regions with valid data in the input grid can be shrinked or expanded by a certain amount (radius). Default: TRUE
expand	maximum expansion distance (radius). Default: 4 [cells]
do.buf	= FALSE
buf.size	buffer size in cell's value. Default: 1
do.use.temp.HPF	already existing high-pass filter files are used. Default: FALSE
do.use.temp.Thresh	already existing thresholding files are used. Default: FALSE
path.save	output path for saving objects. Default: tempdir()
NoData	no data value. Default: -99999
env.rsaga	environment of SAGA GIS. As default, the environment will be automatically estimated. Default: NULL
show.output.on.console	show output on console. Default: FALSE
quiet	no outputs in console. Default: TRUE

Value

raster object

Note

• SAGA GIS must be installed.

raff-k/Lslide documentation built on March 29, 2022, 6:52 p.m.