st_urban_sprawl: Calculate urban sprawl

Description Usage Arguments Value

Description

This function calculates the urban sprawl of urban area.

Usage

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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.

Value

strong urban sprawl: 40-50


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