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I have two polygons in Python:

poly1 = shapely.geometry.polygon.Polygon([(3,4), (2,4),(2,2),(3,2)])
poly2 = shapely.geometry.polygon.Polygon([(4,4), (3,4),(3,2),(4,2)])

that look like this:

enter image description here

Obviously the polygons touch in points (3,4) and (3,2).

How could I add this attribute (touches=True/False or 1/0) to each vertex of the Polygon?

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    The shapefile model includes the option for a "measure" property with each vertex. It's intended for mile-markers, but could be used for this. Your issue is one of scale -- You can only store two such properties (in the Z and M slots).
    – Vince
    Commented Jan 19, 2018 at 12:59
  • I didn't think of the M property! Most probably because I see no option how to tell a shapely LinearRing about M...maybe this is worth another question. I'm not sure though if I got your "issue of scale" correctly...I only need one additional attribute besides X and Y, so there is no problem for me. Is that what you meant?
    – countryman
    Commented Jan 19, 2018 at 16:45
  • Yes, solutions that don't scale well are adequate for simple cases, but which become unwieldy when complexity is introduced.
    – Vince
    Commented Jan 20, 2018 at 4:23
  • That's true! Thanks for the explanation! So still a +1 For the not scalable solution in your comment!
    – countryman
    Commented Jan 21, 2018 at 15:02

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As commented by @Vince:

The shapefile model includes the option for a "measure" property with each vertex. It's intended for mile-markers, but could be used for this. Your issue is one of scale -- You can only store two such properties (in the Z and M slots).

You can read more about this, albeit from an ArcObjects rather than shapely perspective, at Work with vertex attributes.

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