Aggregation atlas

Readings from a neighbourhood add up into a city score, and cities into their region. The region is as high as the adding goes. Above it sit two wider views the Index only watches.

This atlas shows how a city's score gets built up, level by level: the detailed companion to the public Index. Read it as a set of nested rings — a neighbourhood (Community) inside the city, the city inside its region — like a Russian doll, each level sitting inside the next. Each ring is the Fab City Index 3.0 score at that level, for the city you pick. The score is always the same sum: DIDO — data in, data out, what a place can make and share — times (1 − PITO) — products in, trash out, what it still imports and wastes — times ρ, how fast a city turns what it learns into action. To the right sit the two wider views the Index only watches: the bioregion, the natural region a city sits in, and the whole planet. Only the neighbourhood, the city, and the region add up into scores. The bioregion and the planet are read as limits the scores have to live within.

FCIt = DIDO · (1 − PITO) · ρ 4 cities · 3 nested levels · 2 wider views v0, methodology in review
— filled, — total parts (four pillars across three levels) · mock = sample values still waiting on a real source — mock share
City-level score (snapshot)
—
— · FCIt at the City ring mock
DIDO—
1 − PITO—
ρ—
The rule
Community = Operational
City = Governance
Region = Governance · CEILING
Bioregion = Boundary
Planet = Boundary + global knowledge

Why the adding stops at the region. The framework gives three of the five levels a job of adding up (neighbourhood, city, region) and the top two a job of setting limits. The neighbourhood is where the instruments touch the ground; the city is the first level of government that can act; the region is the last. Above the region sit the bioregion's carrying capacity and the planet's broken limits. These are watched, not built up from below.

This matters because people ask why there is no single bioregion score the way there is for a region. The honest answer: no government sits at the bioregion or the planet that could take such a score and act on it fast enough to matter — that speed is ρ. There is only ecological and planetary reference. The rings make that gap plain to see.

↪ Next: read the scale-by-scale walk (these rings told as a story), or open the aggregation rules for the method behind each step up. New: see the same rings drawn on real maps in the aggregation map.