NOTE: This service has been discontinued. Historic data will be preserved for the time being. If you wish to take on the processing infrastructure required to produce these tiles, please reach out.
In combination with a tile-based processing framework like TileReduce, OSM QA tiles allow for fast and parallelized analysis. You can use OSM QA tiles to conflate OpenStreetMap with other datasets, detect bugs like connectivity issues and monitor for vandalism.
Closed ways are represented as either LineString or Polygon geometries, depending on their tags.