I'd like to build a corridor surrounding a polygon, so that the corridor's outer bounds all have the same distance to the inner bounds. Like this:
I've made this lousy graphic in Paint, since I don't even know how this operation is called. I hope you get the idea. To avoid confusion and misplaced suggestions: the outer polygon is NOT a scaled version of the inner. I know I need some transformation for this, I just don't know what kind of.
I'm implementing it in Python, I thought of shapely library, but I'm not sure if that's the one to do it, less so which method might be useful. Thanks in advance