def angle_bet_two_linestring_ignore_inte_point(line1:LineString, line2:LineString ):
"""计算两条LineString的角度，仅仅考虑起点和终点
Args:
a (LineString or pd.Series): LineString 或者 pd.Series（包含的geometry为LineString）
b (LineString): [description]
Returns:
[type]: 返回角度
"""
a, b = line1.copy(), line2.copy()
if isinstance(a, pd.Series): a = a.geometry
if isinstance(b, pd.Series): b = b.geometry
line_a, line_b = {}, {}
line_a['x0'], line_a['y0'], line_a['x1'], line_a['y1'] = a.coords[0] + a.coords[-1]
line_b['x0'], line_b['y0'], line_b['x1'], line_b['y1'] = b.coords[0] + b.coords[-1]
return angle_bet_two_line(line_a, line_b)
