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CAPTCHA
FOSDEM 2025 - MapTCHA, the open source CAPTCHA that improves OpenStreetMap
MapTCHA is an open-source CAPTCHA solution that combines bot prevention with OpenStreetMap improvement by having users verify AI-predicted building outlines in aerial imagery. The system leverages human verification to validate both known and unknown cases, aggregating responses through voting to suggest new locations for OSM mapping while using fAIr, an open-source AI mapping system by HOT.
Please complete security verification
A CAPTCHA verification system prompts users to press and hold a button until it turns green to verify their human status, with an option to contact support for errors.
Please complete security verification
A CAPTCHA verification page prompts users to confirm their human identity by pressing and holding a button until it turns green.