How to use the movingpandas.geometry_utils.measure_distance_spherical function in movingpandas

def _compute_distance(self, row):
        pt0 = row['prev_pt']
        pt1 = row[self.get_geom_column_name()]
        if not isinstance(pt0, Point):
            return 0.0
        if pt0 == pt1:
            return 0.0
        if self.is_latlon:
            dist_meters = measure_distance_spherical(pt0, pt1)
        else:  # The following distance will be in CRS units that might not be meters!
            dist_meters = measure_distance_euclidean(pt0, pt1)
        return dist_meters

def is_representative_max_distance(self):
        p_i = self.traj.df.iloc[self.i][self.traj.get_geom_column_name()]
        p_j = self.traj.df.iloc[self.j][self.traj.get_geom_column_name()]
        if self.traj.is_latlon:
            d_space = measure_distance_spherical(p_i, p_j)
        else:
            d_space = measure_distance_euclidean(p_i, p_j)

        if d_space >= self.max_distance:
            self.significant_points.append(p_i)
            return True
        else:
            return False

def more_points_further_than_min_distance(self):
        for self.k in range(self.j + 1, self.n):
            p_j = self.traj.df.iloc[self.j][self.traj.get_geom_column_name()]
            p_k = self.traj.df.iloc[self.k][self.traj.get_geom_column_name()]
            if self.traj.is_latlon:
                d_space_j_k = measure_distance_spherical(p_j, p_k)
            else:
                d_space_j_k = measure_distance_euclidean(p_j, p_k)
            if d_space_j_k >= self.min_distance:
                return True
        return False

def _compute_speed(self, row):
        pt0 = row['prev_pt']
        pt1 = row[self.get_geom_column_name()]
        if not isinstance(pt0, Point):
            return 0.0
        if not isinstance(pt1, Point):
            raise ValueError('Invalid trajectory! Got {} instead of point!'.format(pt1))
        if pt0 == pt1:
            return 0.0
        if self.is_latlon:
            dist_meters = measure_distance_spherical(pt0, pt1)
        else:  # The following distance will be in CRS units that might not be meters!
            dist_meters = measure_distance_euclidean(pt0, pt1)
        return dist_meters / row['delta_t'].total_seconds()

def _generalize_traj(self, traj, tolerance):
        temp_df = traj.df.copy()
        prev_pt = temp_df.iloc[0][traj.get_geom_column_name()]
        keep_rows = [0]
        i = 0

        for index, row in temp_df.iterrows():
            pt = row[traj.get_geom_column_name()]
            if traj.is_latlon:
                dist = measure_distance_spherical(pt, prev_pt)
            else:
                dist = measure_distance_euclidean(pt, prev_pt)
            if dist >= tolerance:
                keep_rows.append(i)
                prev_pt = pt
            i += 1

        keep_rows.append(len(traj.df)-1)
        new_df = traj.df.iloc[keep_rows]
        new_traj = Trajectory(new_df, traj.id)
        return new_traj