Steepest streets.

[vr00n]

Placeholder to tackle later.

https://twitter.com/latimes/status/981597314270859264?s=20

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[jazzzchan]

if this issue is opened to tackle the slope problem. From OSMnx there are two methods to calculate the slope(elevation degree) .

1. Elevation between nodes
2. Grades (ratio of elevation / edges length) between edges.

For this problem solely I think elevation between nodes is enough but really depends on what this issue is trying to solve?

[ywnch]

would be interesting to see what data Google used

[jazzzchan]

They (Google earth) use Grade % calculation by the way

[vr00n]

Google Maps has something called Elevations API . - https://developers.google.com/maps/documentation/elevation/start

BUT

there is an OPEN source alternative! https://open-elevation.com/

ALSO run the below on http://overpass-turbo.eu/ a querying engine for Open Street Maps. These are individual users adding the inclination tag to a few streets only.

[out:json][timeout:45];
(
  way["incline"]({{bbox}});
);
out body;
>;
out skel qt;

It would be amazing if we are able to contribute to Open Street Maps by automatically attaching inclination information based on the Open Elevation API.

OSM definition of Key=Incline https://wiki.openstreetmap.org/wiki/Key:incline

[patwater]

This is so cool! Glad you all are exploring this :)

[vr00n]

POC:

1. For every OSM way (how a street segment is represented in OSM jargon) get the lat/long of start-node and end-node
2. Compute elevation of start-node via https://api.open-elevation.com/api/v1/lookup?locations=lat,long
3. Compute elevation of end-node via https://api.open-elevation.com/api/v1/lookup?locations=lat,long
4. Calculate inclination grade.

5. Output top-5 steepest in radroads.py

6. Submit to OSM - https://wiki.openstreetmap.org/wiki/Automated_edits