Summarise a ctdf by cluster

Returns one row per cluster with start/stop times, tenure (days), convex‐hull centroid and row‐count.

Usage

# S3 method for class 'ctdf'
summary(ctdf, ...)

Arguments

...

Currently ignored.

object

A ctdf (inherits data.table).

Value

A data.table (and data.frame) of class c("summary_ctdf","data.table","data.frame").

Examples

#' data(mini_ruff)
ctdf = as_ctdf(mini_ruff)
cluster_track(ctdf)
summary(ctdf)
#>    cluster               start                stop                geometry
#>      <int>              <POSc>              <POSc>             <sfc_POINT>
#> 1:       1 2015-05-31 17:43:18 2015-06-01 02:25:38 POINT (2733519 7441508)
#> 2:       2 2015-06-01 08:58:48 2015-06-03 00:22:51 POINT (2863276 7442316)
#> 3:       3 2015-06-03 06:21:09 2015-06-05 12:40:33 POINT (2943517 7429601)
#> 4:       4 2015-06-06 01:36:52 2015-06-08 19:05:21 POINT (2865266 7441365)
#>        ids     N         tenure  dist_to_next
#>     <char> <int>     <difftime>       <units>
#> 1:    5-12     8 0.3627315 days 129759.27 [m]
#> 2:   26-82    50 1.6417014 days  81242.50 [m]
#> 3:  91-177    74 2.2634722 days  79130.26 [m]
#> 4: 191-276    81 2.7281134 days        NA [m]