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Update docs for tile plugin.

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Daniel Patterson 2016-11-15 18:54:41 -08:00
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@ -672,4 +672,15 @@ The `x`, `y`, and `zoom` values are the same as described at https://wiki.openst
The response object is either a binary encoded blob with a `Content-Type` of `application/x-protobuf`, or a `404` error. Note that OSRM is hard-coded to only return tiles from zoom level 12 and higher (to avoid accidentally returning extremely large vector tiles).
Vector tiles contain just a single layer named `speeds`. Within that layer, features can have `speed` (int) and `is_small` (boolean) attributes.
Vector tiles contain two layers:
| Layer | Field | Type | Description |
| -------- | ------------ | --------- | ---------------------------------------- |
| `speeds` | `speed` | `integer` | the speed on that road segment, in km/h |
| | `is_small` | `boolean` | whether this segment belongs to a small (<1000 node) [strongly connected component](https://en.wikipedia.org/wiki/Strongly_connected_component) |
| | `datasource` | `string` | the source for the speed value (normally `lua profile` unless you're using the [traffic update feature](https://github.com/Project-OSRM/osrm-backend/wiki/Traffic), in which case it contains the stem of the filename that supplied the speed value for this segment |
| | `duration` | `float` | how long this segment takes to traverse, in seconds |
| | `name` | `string` | the name of the road this segment belongs to |
| `turns` | `bearing_in` | `integer` | the absolute bearing that approaches the intersection. -180 to +180, 0 = North, 90 = East |
| | `turn_angle` | `integer` | the angle of the turn, relative to the `bearing_in`. -180 to +180, 0 = straight ahead, 90 = 90-degrees to the right |
| | `cost` | `float` | the time we think it takes to make that turn, in seconds. May be negative, depending on how the data model is constructed (some turns get a "bonus"). |