d53c267129
Roundabout Intersections are roundabouts with up to four ways and turn
angles which makes the turns obvious, e.g. as in:
```
*
*
* * * *
*
*
```
but not
```
*
*
* * *
* *
* *
```
For Roundabout Intersections we issue instructions such as
"turn <direction>" instead of "take the <nth> exit".
At the moment we have a limit on the radius for these Roundabout
Intersections of 5 meters. Which fails to classify a wide range of
Roundabout Intersections in the US (with the US-wide streets).
This changeset removes the Roundabout Intersection radius limit:
- if the roundabout is larger than a threshold and is named we classify
it as a rotary
- if the roundabout matches our criteria for Roundabout Intersections
we classify it as a Roundabout Intersection
- else fallback to plain old Roundabout
There is a second issue with determining a roundabout's radius.
But that's for another pull request (tracking in #2716).
References:
- https://github.com/Project-OSRM/osrm-backend/issues/2716
39 lines
1.3 KiB
C++
39 lines
1.3 KiB
C++
#ifndef OSRM_EXTRACTOR_GUIDANCE_CONSTANTS_HPP_
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#define OSRM_EXTRACTOR_GUIDANCE_CONSTANTS_HPP_
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namespace osrm
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{
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namespace extractor
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{
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namespace guidance
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{
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const bool constexpr INVERT = true;
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// what angle is interpreted as going straight
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const double constexpr STRAIGHT_ANGLE = 180.;
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// if a turn deviates this much from going straight, it will be kept straight
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const double constexpr MAXIMAL_ALLOWED_NO_TURN_DEVIATION = 3.;
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// angle that lies between two nearly indistinguishable roads
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const double constexpr NARROW_TURN_ANGLE = 40.;
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const double constexpr GROUP_ANGLE = 60;
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// angle difference that can be classified as straight, if its the only narrow turn
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const double constexpr FUZZY_ANGLE_DIFFERENCE = 25.;
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const double constexpr DISTINCTION_RATIO = 2;
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// Named roundabouts with radii larger then than this are seen as rotary
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const double constexpr MAX_ROUNDABOUT_RADIUS = 15;
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// Unnamed small roundabouts that look like intersections are announced as turns,
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// guard against data issues or such roundabout intersections getting too large.
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const double constexpr MAX_ROUNDABOUT_INTERSECTION_RADIUS = 25;
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const double constexpr INCREASES_BY_FOURTY_PERCENT = 1.4;
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const int constexpr MAX_SLIPROAD_THRESHOLD = 250;
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} // namespace guidance
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} // namespace extractor
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} // namespace osrm
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#endif // OSRM_EXTRACTOR_GUIDANCE_CONSTANTS_HPP_
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