Underpass is a customizable data engine that processes mapping data.

It updates a local copy of the OSM database in near real-time, and provides customizable statistics and validation reports. It is designed to be high performance on modest hardware.

We've deployed a rudimentary demo that keeps a database up-to-date for (some country), rendering buildings and highlighting the ones identified as "un-squared":

https://underpass.live

Check the documentation

Check the tasks board and roadmap here

We invite software designers and developers to contribute to the project, there are several issues where we need help, some of them are:

• Designs for data visualizations
• React UI components
• Data quality checks for the C++ core engine
• PostgreSQL queries for the Python dbapi module
• Endpoints for the Python restapi module
• Packages for Python, React and system binaries
• Data models for semantic validation
• Tests for everything

Underpass is free software! you may use any Underpass project under the terms of the GNU General Public License (GPL) Version 3.