The Cartographer's Dilemma: When Is a Map Too Good to Be True?
We often think of open data, particularly the kind that paints a picture of place and infrastructure, as an unvarnished good. The more detailed, the more accurate, the better. A digital public record of every streetlight, sewer cap, and park bench, available for anyone to download, seems like a triumph of civic transparency. But I’ve been thinking about a quieter, more unsettling side to this precision. What happens when the map becomes so detailed it ceases to be a useful abstraction and starts to become a target?
The Illusion of Neutral Detail
I was recently exploring an open portal from a midsize city, one praised for its commitment to open governance. Among the usual datasets—budgets, crime reports, zoning maps—was a remarkably granular one: “Public Infrastructure Assets.” It wasn’t just roads and pipes. It was a point-for-point geolocated inventory of every municipal bench, bike rack, waste bin, and historic plaque. Each entry had an asset ID, installation date, material composition, and last inspection log. As a piece of digital preservation, it was magnificent. As a public-facing document, it gave me pause.
This wasn’t a map to help you find a place to sit. It was a complete, queryable ledger of publicly owned objects. In the abstract, it speaks to meticulous stewardship. In practice, it creates a perfect shopping list. The very completeness that makes it a robust archival record also makes it a potent tool for anyone with motives opposite to preservation: scrap metal thieves, vandals, or anyone looking to systematically dismantle or exploit public property. The data, preserved for public good, can be inverted to accelerate public decay.
This is the cartographer’s dilemma in the age of open data. A medieval mapmaker might intentionally skew a coastline or omit a village to protect a trade secret or a vulnerable community. Our digital systems, striving for perfect fidelity, often lack this protective obscurity. We preserve not just the ‘what’ but the exact ‘where and when,’ divorcing the data from the social and physical context that once offered a measure of security through ambiguity.
The answer isn’t to shutter the portals or revert to paper. It’s to build a more nuanced ethic of publication, one that considers preservation not just of the data, but of the things the data represents. Perhaps some datasets should be released with temporal lag, obscuring real-time location. Perhaps asset IDs should be public, but precise coordinates should reside in a managed access layer for verified maintenance crews. The goal is to balance the right to know with the responsibility to protect.
True open data wisdom lies not in dumping every byte, but in thoughtful curation. It asks: what are we preserving, and for whom? A map is a model of reality, not reality itself. The best models have always understood that certain details, while factually correct, can distort the territory in dangerous ways. In our zeal to archive the physical world with digital perfection, we must remember that sometimes, the kindest thing a cartographer can do is to leave a few things gracefully, intentionally unmapped.
Notes & further reading
A few pages I came back to while writing this: