Match multiple parts of the route individually in case of self-intersection #79
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Aren't we having the same problem with invalid matches again, if we extend this part? A traffic light might gets projected on two different route segments at the intersection point. @PhilippMatthes |
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@adeveloper-wq yes you are right. Then we should only extrend the ingress and egress parts |
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@adeveloper-wq actually now that I think about it, we should cut the loop part to the length the other segments are elongated. Otherwise the projection of the loop could be interpreted as a turn, if you know what I mean |
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I just wanted to write the same. 👍 |
| buffer = 100 # distance in meter | ||
| buffer_wgs84 = buffer / 40000000.0 * 360.0 # wgs84 | ||
| for part in unary_union: | ||
| buffered = route_linestring.intersection(part.buffer(buffer_wgs84)) |
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I think this part is also not really working. When we intersect the complete route linestring with the buffered segments, intersections of the route linestring are also going to lay in the buffer polygon. Therefore, the intersection of the route_linestring with the buffer polygon will likely result in a MultiLinestring for those cases. Or in a single Linestring, but where we still have the intersection in it.
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Solution would be to elongate / shorten along the line, which is a bit more implementation work but should be easy.
Closes: #69
In #69 we discussed a bit about routes that intersect with themselves. This leads to the issue that traffic light geometries may not be projected onto a continuous segment of the route, impairing the matching. With this PR I propose a solution to this issue.
The idea is to split the route at the intersection point into three parts and elongate them:
In this way each part keeps important shape information about the road crossing at which the intersection occurred, without cutting the geometries in the middle. See screenshot below that illustrates the overlap:
The traffic lights matched to each individual elongated segment are combined and duplicates eliminated.
@adeveloper-wq please evaluate my possible solution with a few more examples when you are back from vacation.