Turns and Angular Analysis

Turns

Turns can be calculated using calc_angle().

traja.trajectory.calc_angle(trj: TrajaDataFrame, unit: str = 'degrees', lag: int = 1)

Returns a Series with angle between steps as a function of displacement with regard to x axis.

Parameters:

• trj (TrajaDataFrame) – Trajectory

• unit (str) – return angle in radians or degrees (Default value: ‘degrees’)

• lag (int) – time steps between angle calculation (Default value: 1)

Returns:

Angle series.

Return type:

angle (pandas.Series)

Heading

Heading can be calculated using calc_heading().

traja.trajectory.calc_heading(trj: TrajaDataFrame)

Calculate trajectory heading.

Parameters:

trj (TrajaDataFrame) – Trajectory

Returns:

heading as a Series

Return type:

heading (pandas.Series)

..doctest:

>>> df = traja.TrajaDataFrame({'x':[0,1,2],'y':[1,2,3]})
>>> traja.calc_heading(df)
0     NaN
1    45.0
2    45.0
Name: heading, dtype: float64

Angles

Angles can be calculated using angles().