geom_sftrack: Function to plot sftrack objects in ggplot

In sftrack: Modern Classes for Tracking and Movement Data

Function to plot sftrack objects in ggplot

Description

This function can be added to ggplot() to plot an sftrack and sftraj Function does not yet work with ggplot grammer so you must but data= in this function

Usage

geom_sftrack(mapping, data, ...)

## S3 method for class 'sftrack'
geom_sftrack(mapping = ggplot2::aes(), data = NULL, ...)

## S3 method for class 'sftraj'
geom_sftrack(mapping = ggplot2::aes(), data = NULL, ..., step_mode = FALSE)

Arguments

mapping	mapping aesthetics for ggplot.
data	the sftraj or sftrack object.
...	arguments to passed to ggplot
step_mode	TRUE/FALSE, whether to plot in step_mode, See details

Details

step mode refers to considering the trajectory as individual 'steps', in the case of plot this means it will plot each line & point individually. This approach is much slower to plot when n(steps)>10,000. The alternative method is to merge the steps into a multilinestring of continuous lines. This is much faster to plot.

Examples

#'
require("ggplot2")
data("raccoon")
raccoon$timestamp <- as.POSIXct(raccoon$timestamp, "EST")
burstz <- c(id = "animal_id")

# sftraj will as well for the most part, however as its a more complex
# structure to speed up plotting.
my_sftraj <- as_sftraj(raccoon,
  time = "timestamp",
  coords = c("longitude", "latitude"),
  group = burstz
)

ggplot() +
  geom_sftrack(data = my_sftraj)

sftrack documentation built on March 31, 2023, 7:27 p.m.