hiPassSegmentation: Contrast-Filter-Segmentation

Description Usage Arguments Value

Description

This function performs a contrast filter segmentation on an input RasterLayer. In the firest stept the raster is converted to a gray-scale matrix, followed by filter functions of the EBImage package. Then, the filtering is applied as mask on the segmentation-input. Afterwards, a segmentation is performed using GRASS GIS region growing. Finally, the segments are transformed to SpatialPolygonsDataFrame and returned as function output. In the future this funcion will be included in the segmentation-function.

Usage

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hiPassSegmentation(input.filter, input.segmentation = input.filter,
  result.filter = NULL, scale.factor, threshold,
  env.rsaga = RSAGA::rsaga.env(), writeRaster.NAflag = -99999,
  show.output.on.console = FALSE, quiet = TRUE,
  Grass.Segmentation.Threshold = 0.24, Grass.Segmentation.Minsize = 1,
  Grass.Segmentation.Memory = 1024,
  Segments.Poly = file.path(tempdir(), "outSegPoly.shp"),
  Segments.Grid = file.path(tempdir(), "outSegGrid.sgrd"),
  load.output = FALSE, fill.holes = FALSE,
  estimateScaleParameter = FALSE, ...)

Arguments

input.filter

RasterLayer on which the filtering is applied

input.segmentation

RasterLayer for segmentation. Default: input.filter

env.rsaga

environment of SAGA GIS. Default: RSAGA::rsaga.env()

writeRaster.NAflag

NoData values for NA values in raster. Default: -99999

show.output.on.console

show output of tools on console. Default: FALSE

quiet

do not show comments and process time in console. Default: TRUE

Grass.Segmentation.Threshold

threshold used of merging segments. Default: 0.24

Grass.Segmentation.Minsize

minsize of a segment. Default: 0

Grass.Segmentation.Memory

memory used in computation. Default: 1024

Segments.Poly

output location for segmented objects (shapefile). Default: paste0(tempdir(), "/", "outSegPoly.shp")

Segments.Grid

output location for segmented grid. Default: paste0(tempdir(), "/", "outSegGrid.sgrd")

estimateScaleParameter

must be only be TRUE when scale parameter function is used. Default: FALSE

...

parameters for function hiPassThresh

Fast.Representativeness.LevelOfGeneralisation

level of generalisation for computing seed points. Default: "2.0"

Value

SpatialPolygonsDataFrame containing the segments/objects


ggRaver/Lslide documentation built on June 20, 2019, 2:29 p.m.