layer:
  id: "obs_roads"
  description: |
      Road segment statistics for OBS events
  buffer_size: 4
  fields:
    distance_overtaker_min: |
      Overtaker minimum distance in meters.
    distance_overtaker_max: |
      Overtaker maximum distance in meters.
    distance_overtaker_mean: |
      Overtaker mean distance in meters.
    distance_overtaker_median: |
      Overtaker median distance in meters.
    distance_overtaker_array: |
      All overtaker distance values in meters.
    overtaking_event_count: |
      Number of overtaking events.
    direction: |
      Contains -1 for events while going along the way backwards, 1 for
      forwards. Each road is emitted twice, if it has data for both directions,
      even if it is oneway.
    offset_direction: |
      Factor for offset to shift the line to the driving side. One of -1, 0, 1.
  defaults:
    srs: EPSG:3785
  datasource:
    srid: 3857
    geometry_field: geometry
    key_field: way_id
    key_field_as_attribute: no
    query: |
      (
        SELECT
          way_id,
          geometry,
          distance_overtaker_mean,
          distance_overtaker_min,
          distance_overtaker_max,
          distance_overtaker_median,
          distance_overtaker_array,
          overtaking_event_count,
          direction,
          offset_direction
        FROM layer_obs_roads(!bbox!, z(!scale_denominator!))
      ) AS t

schema:
  - ./layer.sql