Dangles are like cul-de-sac (roads). You can find them only in LineStrings where a line ends and does not connect to another line segment. "To dangle in the air" refers to a LineString that is not connected to any other LineString. These are very important to identify if you are looking to ensure that a road network is connected or to identify where streets come together as they should.
A more technical description of a dangle could be described as an edge that has one or both ends that are not incidental to another edge endpoint.
You will now check for dangles on your set of LineStrings as follows:
#!/usr/bin/env python # -*- coding: utf-8 -*- from utils import shp2_geojson_obj from utils import create_shply_multigeom from utils import out_geoj from shapely.geometry import Point in_shp_dangles = "../geodata/topo_dangles.shp" shp1_data = shp2_geojson_obj(in_shp_dangles) shp1_lines = create_shply_multigeom(shp1_data, "MultiLineString") def...