sp2sl: Convert pairs of coordinates to 'SpatialLines'

In quickPlot: A System of Plotting Optimized for Speed and Modularity

Convert pairs of coordinates to SpatialLines

Description

This will convert 2 objects whose coordinates can be extracted with coordinates (e.g., ⁠sp::SpatialPoints*⁠) to a single SpatialLines object. The first object is treated as the "to" (destination), and the second object the "from" (source). This can be used to represent directional SpatialLines, especially with with arrow heads, as in Plot(sl, length = 0.1).

Usage

sp2sl(sp1, from)

Arguments

sp1	a ⁠SpatialPoints*⁠ object
from	a ⁠SpatialPoints*⁠ object. Optional. If not provided, then the function will attempt to find the "previous" coordinates as columns (prevX, prevY) in the sp1 object.

Examples

caribou <- terra::vect(
  x = cbind(
    x = stats::runif(1e1, -50, 50),
    y = stats::runif(1e1, -50, 50)
  )
)
caribouFrom <- terra::vect(
  x = cbind(
    x = stats::runif(1e1, -50, 50),
    y = stats::runif(1e1, -50, 50)
  )
)
caribouLines <- sp2sl(caribou, caribouFrom)
if (interactive()) {
  clearPlot()
  Plot(caribouLines, length = 0.1)
}

quickPlot documentation built on Aug. 8, 2025, 7:17 p.m.