topdowntimeratio (version 0.1.0)

getSegsExtra: Get Segments with calculated data

Description

This function calculates various segment-level metrics that require the raw data before returning a data.table with the segments and the calculated results. Calculates speed, bearing and radius of gyration information.

Usage

getSegsExtra(
  data,
  coord.type = c("coordinate", "distance", "both"),
  group = FALSE
)

Value

data.table of segments, annotated with segment-level information on distance, mean and variance of immediate bearing difference, total bearing variance over the segment, mean, maximum and variance of calculated speed in meters per second, percentage of zero-speed entries, whether the segment consists of fewer than 3 locations, and the time-weighted radius of gyration.

Arguments

data

data.table returned from function /codetdtr

coord.type

return actual coordinates, relative distance, or both

group

Separate by group, default is FALSE

Examples

df <- data.frame(entity_id = rep(1, 12),
   timestamp = c(1, 2, 4, 10, 14, 18, 20, 21, 24, 25, 28, 29),
   lon = c(5.1299311, 5.129979, 5.129597, 5.130028, 5.130555, 5.131083,
           5.132101, 5.132704, 5.133326, 5.133904, 5.134746, 5.135613),
   lat = c(52.092839, 52.092827, 52.092571, 52.092292, 52.092076, 52.091821,
           52.091420, 52.091219, 52.091343, 52.091651, 52.092138, 52.092698))
# First generate segments
res100 <- tdtr(df,
     group_col = NULL,
     max_error = 100)
# Then extract a data.table of segments
getSegsExtra(res100)