moveParams: Estimate movement parameters from timestamped xy data

Description Usage Arguments Value Author(s) Examples

View source: R/moveParams.R

Description

The function will estimate common movement parameters from the given xy coordinates and timestamp data. The data can be returnded by itself as a data.table or added to an existing data.table.

Usage

1
moveParams(df, xyti = c("x", "y", "timestamp", "ndowid"), format = NULL)

Arguments

format

Format of the date time string to be passed to the as.POSIXct. The default is NULL assuming that timestamps will be in the "standard unambiguous format", i.e. YYYY-MM-DD HH:MM:SS. If the timestamp is already of class POSIXct, this isn't required.

x

The x component of the xy data

y

The y component of the xy data

timestamp

The timestamp of the xy data

dat

Additional data for the returned data to be added to (optional)

Value

a data.table with the following columns:

dist

the distance between xy locations (meters)

nsd

net squared displacement (meters)

dt

duration between xy locations (seconds)

speed

velocity between xy locations (km/hr)

phi, theta

absolute and turning angle (respectively)

vp

persistence velocity

vt

turning velocity

Author(s)

Mitchell Gritts

Examples

1
df <- moveParams(df$X, df$Y, df$timestamp, dat = df, format = '%Y-%m-%d %H:%M:%S')

ndow-wisr/wildlife_tools documentation built on May 23, 2017, 11:36 a.m.