Polisynth01 / 07
It gathers the city's public data, from budgets and council records to satellite imagery, and estimates conditions for every block and month. Leaders use it to see where the need is, compare options, set what each program must achieve, and check whether it works.
The problem02 / 07
Health, housing, public safety, transit and social services each run separate systems. Questions that cross them take months to answer, and programs are often renewed without evidence of results.
The platform03 / 07
Budgets, council records, permits, service requests, state and federal data and satellite imagery are matched to the same blocks and months. The city's own records can be added later, under its control.
Estimates04 / 07
Where records are missing or out of date, the model estimates thousands of measures of health, safety, housing and the economy, each with a range, from past years to the present.
Imagery05 / 07
Tree cover, surface heat and land use are measured from satellite imagery and joined to the city's other records.
Scale06 / 07
The same model covers the whole county and every block and building in it.
Commitments07 / 07
Targets are set before the money moves, and staff are alerted when delivery or results fall behind.
Products
Each answers one of the four questions behind a city decision: where the need is, what each option would do, what a program must achieve, and whether it is working.
Platform
Gathers a city's public data into one model.
Budgets, council records, service requests, state and federal data and satellite imagery, matched to every block and month, with an estimate for each measure from past years to the present.
Explore Zenith
Simulation Pilot
Tests proposals on synthetic residents before funding.
Compare a proposed program with its alternatives on stand-in residents built from census data and the city's model, before any money is committed.
Explore Parallax
Commitments Pilot
Holds every funded program to the result it promised.
Before money moves, each program gets a written commitment: the result, how it is measured, the starting point, the target and date, and who owns it. Sidereal tracks delivery and results against it.
Explore Sidereal
AI analysts
Answers questions, diagnoses departments and evaluates programs.
Staff ask in their own words and get an answer in seconds, with the source, the period and how certain it is.
Explore MeridianDepartments
Public health
Public safety
Transportation
Housing and development
Budget and finance
City council
Case study
Zenith and Meridian on one city's own records and public data, with a Parallax pilot. What it found and how the city uses it.
Read the case studyResearch and data
Research note · October 2026
In the first deployment, 5% of blocks carry 45% of estimated injury crashes.
ReadData · October 2026
More than 1,000 public sources, gathered and matched to every block and month.
ReadCase study · October 2026
Zenith and Meridian on one city's records and public data, with a Parallax pilot.
ReadLatest
Trust
Records are used only for that city's work, under its data-use agreement. They are never shared with other cities or sold.
Figures that could identify a person are never shown, and counts under 11 are suppressed everywhere. No resident or employee is scored as an individual.
Access is set by the city, department by department.