Cataloging the world of “hidden” public data



The FOIA dilemma – what can I ask for and how do I ask for it?

Making a Freedom of Information Request is a burdensome process that may involve days or even weeks of work to identify what records are available and enough information about how they are stored to properly phrase the request.

Government agencies are required to disclose a list of their “Major Information Systems.” However, this data represents only a small fraction of the universe of public information accessible via Freedom of Information.

For most government record systems, identifying them typically requires scouring an agency’s website for pages relating to the topic, in the hope to finding small clues to help you infer or make educated guesses about what information an agency may have.


The Solution

Since first discovering FOIA a few years ago, I have made hundreds of Freedom of Information requests across a wide range of topics. And in that time, I have learned a few ways of identifying these hidden record systems.

In some cases, information about these record systems can be inferred from online documents (for example: public RFP documents, Federal Register notices). In other cases, information about record systems can itself be obtained via FOIA (for example: database relational schema, lists of FOIA requests made by other people).

FOIA Mapper compiles this information into a centralized catalog of government records, searchable by topic.


If you would like to learn more about FOIA Mapper, check out the Q&A page or browse the blog posts.


Special thanks to the Knight Foundation for supporting this work with their Prototype Fund.knight prototype fund


Who Am I?

max galka foia mapperI’m Max Galka, a guy who is fascinated by all things data.

I first began using FOIA while working in the finance/insurance industry, modeling natural disasters. Later, I started a real estate data business called Revaluate, which used data obtained via FOIA to help home buyers assess the quality of life in urban neighborhoods.

Currently, I run Elementus, a blockchain transparency project. I also have a data visualization website called Metrocosm, where I use FOIA to create visualizations covering many topics. My work on Metrocosm has been featured in The Economist, The Washington PostTimeThe AtlanticWorld Economic ForumThe Guardian, and others.

I am also a very happily-married husband, an aspiring vegetarian, a feminist, an information privacy paranoid, a UPenn alum, a Guardian contributor, and an adjunct lecturer at the UPenn School of Design.

If you have any questions or comments about FOIA Mapper or just want to say hello, please drop me a line or connect with me on on Twitter: @galka_max.






The Guardian


My interview on NPR’s On the Media discussing what FOIA Mapper’s data says about who uses FOIA and why.