Low zoom state and country boundaries lines need normalized kinds

[brewin]

Tasks:

• Normalize boundary kind values (eg country and state, not raw Natural Earth values).
• Add admin_level to match mid and high zooms (from OSM).

This is more of a breaking change so scheduling for 1.0 milestone.

Original report:

I'm not able to get any admin boundaries to show up using Mapbox GL. The example isn't showing them either even though they're in the style.

{
      "id": "country-boundary",
      "source": "osm",
      "source-layer": "places",
      "type": "line",
      "filter": ["==", "admin_level", "2"],
      "max-zoom": 4,
      "layout": {
        "line-cap": "round",
        "line-join": "round"
      },
      "paint": {
        "line-color": "@building",
      "line-width": {
        "base": 2,
        "stops": [[1, 0.5], [7, 3]]
        }
      }
    }, {
      "id": "state-boundary",
      "source": "osm",
      "source-layer": "places",
      "type": "fill",
      "filter": ["==", "admin_level", "4"],
      "max-zoom": 10,
      "layout": {
        "line-cap": "round",
        "line-join": "round"
      },
      "paint": {
        "fill-color": "@land",
        "fill-outline-color": "#cacecc"
      }
    }

[zerebubuth]

You're right! That looks like the wrong layer. I think the source-layer should be boundaries instead of places. Could you try that and let us know if it works?

[brewin]

Still nothing with boundaries.

[brewin]

I figured out how to get them to show, but I don't think it's correct.

"source-layer": "boundaries",
"filter": ["==", "type", "country"],

I think type should be kind for consistency, and filtering by admin_level doesn't work. Also, there is no mention of the boundaries layer in the docs.

[nvkelso]

Thanks for digging into this! I'll have a closer look on Monday.

Background: There are a few inconsistencies like this today, and normalizing them is something we're committed to for a 1.0 release. It's super helpful to hear feedback like this.

On Feb 6, 2016, at 12:47, brewin notifications@github.com wrote:

I figured out how to get them to show, but I don't think it's correct.

"source-layer": "boundaries",
"filter": ["==", "type", "country"],
I think type should be kind for consistency, and filtering by admin_level doesn't work. Also, there is no mention of the boundaries layer in the docs.

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[nvkelso]

Related, our MapboxGL demo should be updated:

mapzen/mapboxgl-vector-tiles#16

[nvkelso]

From the docs:

Gotchas:

• Admin-0 country and country are equivelant, both should be used in filters.
• Admin-1 boundary and state are equivelant, both should be used in filters.
• Don’t rely on Admin-1 statistical boundary, Admin-1 statistical meta bounds, those will probably be removed in future tile versions.