buildings layer thining on z14 to z15

[peitili]

• Update tests
• Update docs

[nvkelso]

Please also try adding:

16: vectordatasource.transform.quantize_height_round_nearest_10_meters
or
16: vectordatasource.transform.quantize_height_round_nearest_5_meters

(the 5_meters one already exists as a transform, so no need to add)

[nvkelso]

In buildings.yaml:

  - &z15_area_volume
      way_area: { min: 20 }
  - &z16_area_volume
      way_area: { min: 10 }

Which is producing quite a bit of noise in Barcelona at tile 15/16581/12239 (512px size).

Suggest doubling those to:

  - &z15_area_volume
      way_area: { min: 40 }
  - &z16_area_volume
      way_area: { min: 20 }

More extreme we could add back in volume as well:

  - &z15_area_volume
      way_area: { min: 50 }
      volume: { min: 20000 }
  - &z16_area_volume
      way_area: { min: 30 }
      volume: { min: 8000 }

[nvkelso]

LGTM

Depends on tilezen/tilequeue#407

[peitili]

@nvkelso I changed back some end_zoom to 17 since we verified that works with the tilequeue fix tilezen/tilequeue#407

would you go over all the configs here for 17 and 16 again? thanks

[nvkelso]

Estimated impact on 512px sized tiles:

• z13: reduction of 5%
• z14: reduction of 10-15%
• z15: reduction of 1 to 50% (that's right!) due to insane building detail in cities like Barcelona