parea.sample: Percent area sample
In jeffreyevans/spatialEco: Spatial Analysis and Modelling Utilities

parea.sample

R Documentation

Percent area sample

Description

Creates a point sample of polygons where n is based on percent area

Usage

parea.sample(x, pct = 0.1, join = FALSE, sf = 4046.86, stype = "random", ...)

Arguments

`x`	An sf POLYGON object
`pct`	Percent of area sampled
`join`	FALSE/TRUE Join polygon attributed to point sample
`sf`	Scaling factor (default is meters to acres conversion factor)
`stype`	Sampling type ('random', 'regular', 'nonaligned', 'hexagonal')
`...`	Additional arguments passed to spsample

Details

This function results in an adaptive sample based on the area of each polygon. The default scaling factor (sf) converts meters to acres. You can set sf=1 to stay in the native projection units

Value

An sf POINT object

Author(s)

Jeffrey S. Evans <jeffrey_evans@tnc.org>

Examples

library(sf)
nc <- st_read(system.file("shape/nc.shp", package="sf"))
  nc <- suppressWarnings(st_cast(nc[c(10,100),], "POLYGON"))
  
 ( ars <- parea.sample(nc, pct=0.001, join = TRUE, stype='random') ) 
     plot(st_geometry(nc))
        plot(st_geometry(ars), pch=19, add=TRUE)

jeffreyevans/spatialEco documentation built on April 4, 2024, 10:53 a.m.