People can use StreetComplete and other software to enhance existing data (e.g. building heights/floors) and overall improve the underlying OpenStreetMap data that it (in part) uses.

Some of the data it uses is based on OpenStreetMap. There was a viral story about a 212-story building due to a typo.

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SCEE (StreetComplete expert edition) is available with additional quests (especially for those with domain knowledge) and customization for experienced mappers. It includes a quest “What is the genus or species of this tree?” among others. Please see its FAQ.

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