Accessing street line data

[bnolan]

I'm trying to use a physics engine to constrain people so they can only walk around the city on visible roads. I can't see any way to get the street centerline data out of mapbox gl. Can someone give me pointers on where to start looking for the centerline data for streets? I'm happy to share a demo showing how to use the data or contribute to an API if people can give me some pointers. :)

[mourner]

Try using map.featuresAt method, passing geometry: true in the options https://www.mapbox.com/mapbox-gl-js/api/

[bnolan]

I've got the map working correctly here, but when I call featuresAt, I don't get anything returned in the callback.. Any ideas?

map.featuresAt([100,100], {geometry : true, radius : 30}, function(a,b){console.log(a,b)});

[bnolan]

I investigated this a bit, and it seems that this.data in rbush#search doesn't have any content in it.

{"children":[],"leaf":true,"bbox":[null,null,null,null],"height":1}

[bnolan]

Neither of the loaded tiles haves data in their rtrees. :(

[bnolan]

Okay, there's a bug in createBucket.js:31 where interactive is not being set to true for the mapbox source. Hardcoded it to true and it works now. What projection are the tiles in? I'm getting integers like {x : 2883, y : 380}.

[bnolan]

Okay, sorry for spamming here - but is there a way to convert the _geometry included in features back into latitude / longitude? It seems that the _geometry is returned in the extent of the tile it came from, but I can't see any way of working out which tile the _geometry is from?

[mourner]

Okay, there's a bug in createBucket.js:31 where interactive is not being set to true for the mapbox source

Is this a bug? You need to explicitly set interactive: true in the style for the layer to make it work, otherwise it's disabled. This is done for performance.

Will look into lat/lng task...

[bnolan]

How do you set interactive: true in the style? I couldn't find any examples of that. Setting interactive : true on the map doesn't seem to work.

[mourner]

In the style JSON, just put interactive: true as one of the properties of a layer that you'll later query with featuresAt.

[bnolan]

I made a demo of what I'm using featuresAt for.

[mourner]

Oh, nice! So, would including info about the tile (coords/zoom) in the query response suffice for your use case?

[bnolan]

Sure, that'd be great. I can convert from tile coords to lat lng. :)

[jfirebaugh]

Fixed with #1010.