Data catalogue
Zonio runs a dedicated geospatial pipeline that fetches Polish public data from dozens of government and open sources, normalises it into one PostGIS database, and keeps it fresh. The API and the MCP server read from that database directly.
Explore the data on zonio.tech
The zonio.tech layer atlas is the reference for what Zonio holds: every layer has its own page with a description, the publisher, a link to the original source and a live map preview. Use it to check what a layer contains before you query it, and the national map to see coverage gmina by gmina.
For developers
These pages cover what the atlas does not: how each layer is exposed through the API, and how to reason about gaps and freshness in your code.
Every layer's API id, how it is served, and its page on zonio.tech.
The site-selection screens built on these layers.
What is national, what is partial, and how gaps are reported.
How data is fetched, validated and traced back to its source.