made AISTrajectory child of AISPoints

skais/ais/ais_trajectory.py

@@ -5,6 +5,7 @@ import numpy as np
 from numba import jit
 from scipy.interpolate import interp1d
 
+from skais.ais.ais_points import AISPoints
 from skais.process.basic_features_operations import angular_dispersion
 from skais.utils.geography import great_circle
 from skais.utils.stats import calc_std_dev
@@ -213,7 +214,7 @@ def apply_time_sequence(dat, time, func):
     return result
 
 
-class AISTrajectory:
+class AISTrajectory(AISPoints):
     def __init__(self, df, interpolation_time=None):
         df = df.drop_duplicates(subset=['ts_sec'])
 
@@ -243,7 +244,7 @@ class AISTrajectory:
             df = new_df
 
         # self.df = df.dropna()
-        self.df = df
+        AISPoints.__init__(df)
 
     def __eq__(self, other):
         return self.df.equals(other.df)