Find Duplicated Data in a Track Table

This function attempts to automatically detect duplicated data in track tables.

Usage

duplicated_data(x, type = "txy")

Arguments

x

track table as produced by the track function.

type

A character string or a vector of character strings indicating the type of duplications to look for. The strings can be any combination of "t" (for time duplications) and "x", "y", "z" (for coordinate duplications). For instance, the string "txy" will return data with duplicated time stamps and duplicated x and y coordinates.

Value

A track table of all observations that are duplicated, as per the duplication rule defined by type.

Note

Incomplete data (that is, data containing "NAs") are ignored.

See also

track

Author

Simon Garnier, garnier@njit.edu

Examples

# Create data set with duplicated data
data(short_tracks)
t_df <- track(x = short_tracks$x, y = short_tracks$y, t = short_tracks$t,
              id = short_tracks$id, proj = "+proj=longlat",
              tz = "Africa/Windhoek", table = "df")
t_df <- bind_tracks(t_df, t_df[1:10, ], t_df[100:110, ])

# Find duplicated timestamps
duplicated <- duplicated_data(t_df)