python使用shapely判断两条线是否相交

• 安装shapely模块
  pip install shapely

实现代码

import shapely.wkt as wkt


if __name__ == '__main__':
    line1 = wkt.loads("LINESTRING (116.23760690616871 40.17090730499467, 116.23760690616871 40.17091615348095)")
    line2 = wkt.loads("LINESTRING (116.23761690616871 40.17092015348095, 116.23760690616871 40.17092015348095)")
    # 判断线线是否相交
    print(line1.intersects(line2))
    # 增加0.3米的buffer, 这里0.3/100000后的单位是米
    polygon1 = line1.buffer(0.3/100000)
    polygon2 = line2.buffer(0.3/100000)
    # 判断线段扩展buffer后的范围是否相交
    print(polygon1.intersects(polygon2))

结果

False
True

BaseGeometry.buffer()方法参数说明

1. cap_style-----端点扩展方式

• 1（CAP_STYLE.round） 默认，半圆形扩展
• 2（CAP_STYLE.flat） 不扩展
• 3（CAP_STYLE.square） 方形扩展

端点按半圆形扩展

line = wkt.loads("LINESTRING (116.23760690616871 40.17090730499467, 116.23760690616871 40.17091615348095)")
polygon = line.buffer(0.5/100000)

端点不扩展

line = wkt.loads("LINESTRING (116.23761690616871 40.17092015348095, 116.23760690616871 40.17092015348095)")
polygon = line.buffer(0.2/100000, cap_style=2)

端点按方形扩展

line = wkt.loads("LINESTRING (116.23761690616871 40.17092015348095, 116.23760690616871 40.17092015348095)")
polygon = line.buffer(0.2/100000, cap_style=3)

2. join_style-----折角连接方式

• 1（JOIN_STYLE.round） 默认，圆弧连接
• 2（JOIN_STYLE.mitre） 折角连接
• 3（JOIN_STYLE.bevel）斜面连接
  
  

圆弧连接

line = wkt.loads("LINESTRING (116.23761690616871 40.17092015348095, 116.23760690616871 40.17092015348095, 116.23759890616871 40.17091530499467)")
polygon = line.buffer(0.2/100000, join_style=1)

折角连接

line = wkt.loads("LINESTRING (116.23761690616871 40.17092015348095, 116.23760690616871 40.17092015348095, 116.23759890616871 40.17091530499467)")
polygon = line.buffer(0.2/100000, join_style=2)

斜面连接

line = wkt.loads("LINESTRING (116.23761690616871 40.17092015348095, 116.23760690616871 40.17092015348095, 116.23759890616871 40.17091530499467)")
polygon = line.buffer(0.2/100000, join_style=3)