Im trying to work out if the inconsistencies im noting with roundabout turn_angle’s are due to OSM, or the calculation I’m using to convert is
This works perfectly for most roundabouts, but not all.
Here’s some examples
green icon is start , red is finish
TitleBar has Raw Angle and the conversion
Country is New Zealand, drive on Left
at this roundabout
doing a 180 turn around the roundabout results in a turn_angle : 50.99, raw value 0.89
a 90 degree turn to the left at the same roundabout results in turn_angle151.83, raw value 2.65
a straight through pass has a turn angle of 227 degrees, raw value 3.96
a 90 degree turn at the same roundabout from the opposing direction results in a 330 degree angle , raw 5.77
a straight through pass from opposing direction is 229
At another roundabout just a few hundred meters away the problem does not occur
this is https://www.openstreetmap.org/#map=19/-37.77270/175.29353
the turn angles are correct, from all directions
and still correct from another direction
there are several other roundabouts that calculate incorrectly
Any ideas why such an inconsistency should occur ?
On some of the roundabouts I notice the turn_angle is completely missing and the clockwise value is 2, normally 1, however that’s rare and does not apply to the examples I provided.