Sample a Polygon at Fixed Density

Generate sampling points within a SpatialPolygon object, according to a specified sampling density.

sample.by.poly(p, n.pts.per.ac=1, min.samples=5, 
sampling.type='regular', p4s=NULL)

Arguments

p

a Polygon object, with coordinates in a projected CRS with units of meters

n.pts.per.ac

requested sampling density in points per acre (results will be close)

min.samples

minimum requested number of samples per polygon

sampling.type

sampling type

p4s

a qualified proj4string that will be assigned to sampling points

Details

This function is typically accessed via some kind of helper function such as constantDensitySampling.

Value

A SpatialPoints object.

Author

D.E. Beaudette

Note

This function expects that the Polygon object has coordinates associated with a projected CRS– e.g. units of meters. Invalid geometries may cause errors or yield incorrect sample sizes.