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

st_urban_sprawl

R Documentation

Calculate urban sprawl

Description

This function calculates the urban sprawl of urban area.

Usage

st_urban_sprawl(geom.urban, geom.boundary = NULL, dist = c(100, 100),
  trans = function(x, trans.k) {     x - 1 + 1/(x + trans.k) },
  trans.k = 1, tol = 0.1, extent = NULL, force.extent = FALSE,
  precision = 0, do.preProcessing = TRUE, env.rsaga = NULL,
  use.saga = FALSE, return.geom = FALSE, quiet = TRUE)

Arguments

`geom.urban`	polygon of class sf representing the fragmentation geometry
`geom.boundary`	polygon of class sf representing subregions, e.g. administrative boundaries
`dist`	vector containing distance between lines in x and y direction. Default: c(100, 100) [m]
`trans`	transformation function x-1+1/(x+trans.k) with x as free line and trans.k a constant
`trans.k`	constant in km for transformation function trans. Default: 1
`tol`	tolerance value for intersection with erased lines. Buffering procedure is used.Default: 0.1 [m]
`extent`	Numeric value representing extent for area. Format of vector: c(xmin, xmax, ymax, ymin) . Default: NULL
`force.extent`	If TRUE extent is used instead of geom.boundary (if both are present). Default: FALSE
`precision`	precision for process. See sf::st_set_precision(). Default: 0
`do.preProcessing`	If TRUE (default), the input of geom.frag is, first, dissolved to single part feature, and second, splitted to multi-parts. By this step it is assured, that polygon connected to each other are summarized
`env.rsaga`	environment of SAGA GIS. If st_erase fails then SAGA GIS erase is used. Default: NULL, but in function call if not set: RSAGA::rsaga.env()
`use.saga`	use SAGA GIS for erase process. Default: FALSE
`return.geom`	If set to TRUE, intermediate geometries are returned as well. Default: FALSE
`quiet`	If set to FALSE, actual state is printed to console. Default: TRUE.