Validation

The goal is to hold back suspicious modifications, i.e., those that do not meet quality criteria. Quality is evaluated using OSM tag, metadata, geometry, and changeset properties.

Validators

The currently implemented validators are:

• changeset reject from changeset with comment or ask for review flag.
• delayed: Holds back recent changes for a delay, to allow contested or still-evolving modifications to stabilize.
• deleted: Holds back deleted objects.
• duplicate: Holds back duplicate object additions.
• geom: Holds back objects whose geometry modification exceeds a certain threshold.
• network: Holds back objects that lose or gain connectivity to a network (road network, electrical grid, etc.).
• tags: Holds back objects based on the key and value of their tags.
• user: Holds back objects based on the contributor's name (whitelist or blacklist), first time contributors or blocked contributors.