terra: dots – R documentation

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dots

Make a dot-density map

Description

Create the dots for a dot-density map and add these to the current map. Dot-density maps are made to display count data. For example of population counts, where each dot represents n persons. The dots are returned as a SpatVector. It there is an active graphics device, the dots are added to it with points.

Usage

## S4 method for signature 'SpatVector'
dots(x, field, size,  ...)

Arguments

`x`	SpatVector
`field`	character of numeric indicating field name. Or numeric vector of the same length as `x`
`size`	positive number indicating the number of cases associated with each dot
`...`	graphical arguments passed to `points`

Value

SpatVector (invisibly)

Examples

f <- system.file("ex/lux.shp", package="terra")
v <- vect(f)
v$population <- 1000*(1:12)^2
plot(v)
#d <- dots(v, "population", 10000)
#d

terra

Spatial Data Analysis

v1.2-10

GPL (>= 3)

Authors

Robert J. Hijmans [cre, aut] (<https://orcid.org/0000-0001-5872-2872>), Roger Bivand [ctb] (<https://orcid.org/0000-0003-2392-6140>), Karl Forner [ctb], Jeroen Ooms [ctb] (<https://orcid.org/0000-0002-4035-0289>), Edzer Pebesma [ctb] (<https://orcid.org/0000-0001-8049-7069>)

Initial release

2021-05-12