gr_buffer_geo: Quasi-geographic buffering

In grwat: River Hydrograph Separation and Analysis

Quasi-geographic buffering

Description

Generate the buffer of spatial object in geographic coordinates. The function transforms the object into Azimuthal equidistant projection, then buffers it by the specified radius and then reprojects into geographical coordinate system (WGS84)

Usage

gr_buffer_geo(g, bufsize)

Arguments

g	sf or sfg object with known coordinate system.
bufsize	Numeric value of a buffer distance, in meters.

Value

sf or sfg object, buffered to bufsize and projected into geographic coordinates (WGS84).

Examples

if (require("sf")) {

  library(grwat)
  library(ggplot2)
  path = system.file("extdata", "spas-zagorye.gpkg", package = "grwat")
  basin = sf::st_read(path, layer = 'basin') # read basin region

  basin_buffer = gr_buffer_geo(basin, 25000)

  ggplot() +
    geom_sf(data = basin_buffer, fill = 'orangered', color = 'black') +
    geom_sf(data = basin, fill = 'steelblue', color = 'black')

}

grwat documentation built on Nov. 2, 2023, 5:21 p.m.