Small roads look "stopped", but are actually moving

[nvkelso]

Small roads look "stopped", but are actually moving

[patriciogonzalezvivo]

maybe the server can return deltas from an average... in the previous demo I end up visualizing the delta over time https://github.com/mapzen/open-traffic-poc-data-demo/blob/gh-pages/scene.yaml#L76-L98

So will be blue (green in our case) when start moving... and red when start decelerating. Will be great to have date about the difference respect to an average: usually on this days ppl go at 30km today goes at 40km -> way faster!

[nvkelso]

Can we do a proxy for that where we pretend like the average is:

• highways: highway = motorway: 100 km/hr
• major road: highway = primary, secondary, tertiary: 60 km/hr
• minor road: highway = residential ... and most others: 30 km/hr

(I'm totally spit balling those numbers.)

And then we take the average on the way, subtract that from the expected average speed, and then do the coloring based on that?

[patriciogonzalezvivo]

nice idea! we can pass those numbers as defines or uniforms

[patriciogonzalezvivo]

or better, use the new custom attribute, @bcamper is working on

[nvkelso]

Neat! Can you prototype something like this, please?

…

On Mar 23, 2017, at 13:08, Patricio Gonzalez Vivo ***@***.***> wrote: or better, use the new custom attribute, @bcamper is working on ― You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread.

[patriciogonzalezvivo]

Working on it : )

[patriciogonzalezvivo]

Ok... here is the branch for it https://github.com/opentraffic/tangram-viz-experiments/tree/deltas

Need some TLC on the numbers... I don't see residential geometry and I lower the average speeds to make it less RED.

Take a look to this coloring functions https://github.com/opentraffic/tangram-viz-experiments/blob/deltas/scene.yaml#L35-L49. The tweaking magic happens there... Instead of sending a flag for one_way y replace it with an average speed. The CPU filtering takes care of that. The arrows go at the speed of the speed : ) while de coloring is calculated against the deference with the road type "average". That's the magic number that needs to be tweak ultimately