step_length: Step Length

In robitalec/toast: Very Dry

Description

Calculate basic step length with data.table

Usage

step_length(DT, coords = c("EASTING", "NORTHING"), time = "datetime",
  splitBy = c("id", "yr"), moverate = FALSE, type = "lag",
  preserve = FALSE)

Arguments

DT	data.table
coords	character vector, length 2, coordinate column names. UTM required.
time	character time column name.
splitBy	character vector of column names to split step length calculation by. default is id and yr (individual identifier and year as numeric).
moverate	calculate movement rate? stepLength / dif time, unit hours.
type	default: lag. alternative: lead.
preserve	preserve intermediate cols? default: no.

Examples

# Load data.table
library(data.table)

# Read example data
DT <- fread(system.file("extdata", "DT.csv", package = "toast"))

DT[, datetime := as.POSIXct(datetime)]

DT[, yr := year(datetime)]

step_length(DT, coords = c('X', 'Y'), splitBy = c('ID', 'yr'))

robitalec/toast documentation built on May 17, 2019, 3:14 a.m.